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cocoleveo7686
10-06-2007, 12:32 AM
well i got metered on the audio control i hit 140.6 db's... i have 2 12" Kicker L7's with a hifonics bxi2006d... im kinda shocked at the score, but the last time on a termlab i hit 135 at the kick panel...right now i have a Nolte audio, or as some popel might know Powered 4 sound box that is in the trunk, i dont know if i should get a new box, i was thinking a little bigger, but its going in a nissan sentra let me know what you guys think would help

matrxx dude
10-06-2007, 12:44 AM
ac 190 or 180

ThomasG
10-06-2007, 12:45 AM
ac pshhhh

cocoleveo7686
10-06-2007, 12:54 AM
its the spl-180, the guy at the audio shop didnt have a termlab, he said he just sent it out to get the meter fixed...im just wondering how im not hitting 143-145 my voltage only drops to 13.0 its in a nissan sentra...does anyone know about Nolte Audio boxes, i have one right now i dont if i should swap it out

BASSMEKANIK
10-06-2007, 12:56 AM
im not really too sure, the guy at the audio shop didnt have a termlab, he said he just sent it out to get the meter fixed...im just wondering how im not hitting 143-145 my voltage only drops to 13.0 its in a nissan sentra...does anyone know about Nolte Audio boxes, i have one right now i dont if i should swap it out

yea, throw out tha box and build a new one...

Twistid
10-06-2007, 12:58 AM
l7's ****, i had 2 L7's and a single juggernaut with a sundown1500 knocked them clean out of the ballpark

dB-SPL
10-06-2007, 01:00 AM
Better yet, keep it and sell it to some local. BAM, made your money back for new box materials. :)

-Bill-

matrxx dude
10-06-2007, 01:00 AM
ac 180=6-7 db more than the term

cocoleveo7686
10-06-2007, 01:02 AM
well i think the box is a 3.61 cube box, the biggest i can go is 35Wx14Hx22D any recommendations, i would of thought i would hit more db's then that, i mean it sounds real good and loud, but i would of thought they would be louder...is there any 1 12 i can put 2000 rms to and get more then 140 dbs?

KidThump
10-06-2007, 01:04 AM
Yeah get a 12 inch Mt

A member on here has 1 and is hitting 147 db with 3krms on TL

or Get a Fi BTL

cocoleveo7686
10-06-2007, 01:04 AM
ac 180=6-7 db more than the term

well i dont know how it can be that much different...because the other amp i had when i hit 135 was a ma audio hk897, and the one i have now is hifonics bxi2006d and it slams much much more, way louder then before, and if it was 6-7dbs lower that would mean i hit 134 which doesnt make sense since its so much louder

mlstrass
10-06-2007, 01:05 AM
DD or AQ???

cocoleveo7686
10-06-2007, 01:06 AM
Yeah get a 12 inch Mt

A member on here has 1 and is hitting 147 db with 3krms

yea but just because he didnt hit it doesnt mean that i can, i only have 2000 rms to work with...i want to keep the l7's if i can, if i could get up to like 142-144 dbs id be happy, i would of thought they could reach that...maybe its the box i have them in its also in a nissan sentra if that makes a difference too

matrxx dude
10-06-2007, 01:07 AM
loudness does not always equal more db's

KidThump
10-06-2007, 01:08 AM
yea but just because he didnt hit it doesnt mean that i can, i only have 2000 rms to work with...i want to keep the l7's if i can, if i could get up to like 142-144 dbs id be happy, i would of thought they could reach that...maybe its the box i have them in its also in a nissan sentra if that makes a difference too yuh bein in a trunk car does hurt the score........ put them in a bigger box....like i got my cvx 12s in a 4.5cf ported

get one bout that size if it wont fit in the trunk put it in the back seat.........

KidThump
10-06-2007, 01:08 AM
Make sure its ported and tune it around 38hz if u want high numbers

KidThump
10-06-2007, 01:09 AM
loudness does not always equal more db's

Cone area is another factor

casper97ta
10-06-2007, 01:09 AM
I bet if you scrapped that box you have now and built a nice new ported box you would notice a big difference.

KidThump
10-06-2007, 01:10 AM
Believe it or not Boxes make a HUGE difference

cocoleveo7686
10-06-2007, 01:14 AM
loudness does not always equal more db's

yea but even my windshield moves alot more then it did before, it has to be more dbs than before...

everyone tells me to get a new box, well the biggest space i have is 35Wx14Hx22D can someone tell me the port length and size that would be good for 2 12 L7's and tell me what tuning would be BEST for daily driving

80INCHES
10-06-2007, 01:16 AM
for 2
L7 12's build a ported box 5 cubes tuned to 35hz and u should have no problem hitting more than 140

80

casper97ta
10-06-2007, 01:18 AM
I just did a quick estimate. But using those dimensions I did a quick design of 4cubes tuned at 32hz with 57sq in of port. That should be nice for the 12's. I just did a simple slot vent port 4.5 in wide

Edit: if you do a port 5in wide and a 2nd Port length of 5in, you can get 4cubes at 34.5hz with 62 sq in of port.

cocoleveo7686
10-06-2007, 01:19 AM
for 2
L7 12's build a ported box 5 cubes tuned to 35hz and u should have no problem hitting more than 140

80


i dont think i can fit 5 cubes, THE BIGGEST SPACE I HAVE IS 35WX14HX22D

22mountaineer
10-06-2007, 01:20 AM
Well in a trunk hurts alot, but I see alot of people hatin on the subs and telling you to get whatever kind of sub they have a boner for. I have seen a single l7 hit a 145 on a TL, it has been posted here and you might get another member that has seen it also. I do agree on the try a diff box thing, but as said the people talking all the **** about you dont have ****, also does not have a clue on what kind of box you are even talking about..


So what? Listen to them and get you a **** btl with a new box and you will be hitting 150s?

cocoleveo7686
10-06-2007, 01:20 AM
I just did a quick estimate. But using those dimensions I did a quick design of 4cubes tuned at 32hz with 57sq in of port. That should be nice for the 12's. I just did a simple slot vent port 4.5 in wide


can you tell me the dimensions of the box, and the port length width and height? also wouldnt 32 be a little low to have it tuned to?

casper97ta
10-06-2007, 01:23 AM
Check the edit. I think that would work better. I used your exact measurements: 35x14x22.

80INCHES
10-06-2007, 01:26 AM
with his measurements he can do 4cubes tuned to 37hz with a 62square inch port

80

Doingstuffwell
10-06-2007, 01:29 AM
kicker ftl...


my TC 15" Uber does 140 all day long on 1000 watts rms.

cocoleveo7686
10-06-2007, 01:35 AM
kicker ftl...


my TC 15" Uber does 140 all day long on 1000 watts rms.


your also in a suv, i guarentee if i was in a suv i would be hitting much higher numbers...

"if you do a port 5in wide and a 2nd Port length of 5in, you can get 4cubes at 34.5hz with 62 sq in of port."

does that mean have the port width be 5 inches across, and have the port length be only 5 inches? im kinda lost...i know each side of teh box would have to be 22Dx14H and the port width would be 5 inches wide but how long would the port length thats running parallel with the sides be?

casper97ta
10-06-2007, 01:40 AM
Ygpm

Doingstuffwell
10-06-2007, 01:44 AM
lol SUV doesn't mean higher numbers.


same sub, same box, same amp in my montero was like 143 no problem.


the rover has a wierd as hell shape, lots of space and more CU feet of air in it. takes more to get louder man.

KnOkIn It 420
10-06-2007, 02:56 PM
kicker ftl...


my TC 15" Uber does 140 all day long on 1000 watts rms.


Kicker FTW dumby,How u gonna talk **** about kicker with a score that low.

DarkFox
10-06-2007, 05:39 PM
so much crap talking, he is asking for help, not to tell him his stuff = trash, while what every you happen to run = god mode.



Kicker L7's are great subs and can make ALOT of bass (for SQ or SPL depending on how you make your box)



you said you got a 3.6 cube box now. That said 3.6 to two subs is only 1.8 to each sub, before you subtract your woofer volume. Not good for SPL.



I agree with most the other people here who say just build your own box. Do some research, learn how to build your own box. you will get alot louder then you are now, and feel good about having built it yourself.



With the dimensions you said you have (35Wx14Hx22D) you have a total volume of 6.24 cubic feet. (L x W x H / 1728 = cubic feet) thats plenty of room to work with for 2 12' subs



with what people were talking about the tuning. Its not set in stone but usually people go for like 27-31 Hz for like a SQ setup (a flatter response,) the 31-35 range is probably good for what you want (daily driver good spl,) and usually you see things tunes at 35+ Hz going for spl, they get a much sharper curve and give you a "boomy" sound. not so great at the low lows (that you will want for the rap you listen too) but a higher output at certain frequencies

iagrdshaka
10-06-2007, 06:11 PM
l7's ****, i had 2 L7's and a single juggernaut with a sundown1500 knocked them clean out of the ballpark

Sounds like you had a terrible install for your L7s. :emb:

CRXBMPN
10-06-2007, 06:17 PM
where in Mass are ya? lol if you feel like making a trip to MAINE I'll meter you on the TL for free... I am having a little meter party up here coming up and the more the merrier :P

cocoleveo7686
10-06-2007, 08:11 PM
so much crap talking, he is asking for help, not to tell him his stuff = trash, while what every you happen to run = god mode.



Kicker L7's are great subs and can make ALOT of bass (for SQ or SPL depending on how you make your box)



you said you got a 3.6 cube box now. That said 3.6 to two subs is only 1.8 to each sub, before you subtract your woofer volume. Not good for SPL.



I agree with most the other people here who say just build your own box. Do some research, learn how to build your own box. you will get alot louder then you are now, and feel good about having built it yourself.



With the dimensions you said you have (35Wx14Hx22D) you have a total volume of 6.24 cubic feet. (L x W x H / 1728 = cubic feet) thats plenty of room to work with for 2 12' subs



with what people were talking about the tuning. Its not set in stone but usually people go for like 27-31 Hz for like a SQ setup (a flatter response,) the 31-35 range is probably good for what you want (daily driver good spl,) and usually you see things tunes at 35+ Hz going for spl, they get a much sharper curve and give you a "boomy" sound. not so great at the low lows (that you will want for the rap you listen too) but a higher output at certain frequencies


thanks for the info i really appreciate that...do you think 6 cubes will be too much? tuned to like 34 hz?




where in Mass are ya? lol if you feel like making a trip to MAINE I'll meter you on the TL for free... I am having a little meter party up here coming up and the more the merrier :P


yea let me know when im down to drive there...what part of maine? im in Haverhill MA

DarkFox
10-06-2007, 08:13 PM
I got 1 12" l7 with 1000w RMS in about 3.5 cubes and a pretty good sized port (can remember dimensions off top of head. Sounds great, drops real low

DarkFox
10-06-2007, 08:16 PM
This was before I touched up the cloth and installed the sub, but you get the idea.




http://img119.imageshack.us/img119/6073/picture025dt4.jpg

Lakota
10-06-2007, 11:53 PM
l7's ****, i had 2 L7's and a single juggernaut with a sundown1500 knocked them clean out of the ballpark

I just think that you don't know how to get them loud.

*Looks at sig*

bballer123
10-07-2007, 02:32 AM
Like a lot of other people have said, go with one 12" or 15". Easier to work with your trunk, cubic feet wise when you have one sub. Look at like a DD. Resident DD experts what would be smart?

DarkFox
10-07-2007, 12:16 PM
deleted

cocoleveo7686
10-08-2007, 03:48 PM
i think im goin to build a 4.0 CU box tuned to like 34hz and see how that goes....does anyone think if i put just 1 L7 in a 3.0Cu box will it be louder then both?

cocoleveo7686
10-08-2007, 03:48 PM
i think im goin to build a 4.0 CU box tuned to like 34hz and see how that goes....does anyone think if i put just 1 L7 in a 3.0Cu box will it be louder then both?

cocoleveo7686
10-08-2007, 03:48 PM
i think im goin to build a 4.0 CU box tuned to like 34hz and see how that goes....does anyone think if i put just 1 L7 in a 3.0Cu box will it be louder then both?

cocoleveo7686
10-08-2007, 09:45 PM
bump...

DarkFox
10-08-2007, 11:42 PM
if your looking at 4 cubes after you subtract port and woofer volume should still be pretty good. even if you are not, will still be ok but you just wont be optimizing them.

cocoleveo7686
10-09-2007, 12:48 AM
if your looking at 4 cubes after you subtract port and woofer volume should still be pretty good. even if you are not, will still be ok but you just wont be optimizing them.

yea i know...i got the subs for a good deal...im wondering if i should sell them and get 1 12 that will handle close to 2000 rms and put it in a bigger box...would that be much louder then my 2 12's since i dont have alot of space to work with?

icweiner
10-09-2007, 08:51 AM
my box is as big as yours and i have you by like 4 db in the kick on the TL and i have cvrs in a trunk car.....

cocoleveo7686
10-09-2007, 03:10 PM
my box is as big as yours and i have you by like 4 db in the kick on the TL and i have cvrs in a trunk car.....

i dunno maybe a different car, i have a 2002 sentra spec v...ive heard of people with the same system as mine hitting 143-145 i dont know why im not even close...

KidThump
10-09-2007, 03:16 PM
i dunno maybe a different car, i have a 2002 sentra spec v...ive heard of people with the same system as mine hitting 143-145 i dont know why im not even close...

no keep the L7s.......get a 4.0-4.5cf if it will fit tune it to around 35-37hz
and then push around 1200-1500 rms to the pair if u arent allready and u should be in the 143-145 range

DarkFox
10-09-2007, 03:16 PM
your dimentions of 35Wx14Hx22D are good right? I mean not only will the box physicaly fit that space, but you will be able to get it into the trunk? I dont really have anything going on (currently unemployed) I'll desighn a box for ya.... hell, your in Mass.... I'm in CT now, let me know where your at, maybe I can even give you a hand making it (if ya wanted to come here.) No charge for anything

Lakota
10-09-2007, 03:21 PM
my box is as big as yours and i have you by like 4 db in the kick on the TL and i have cvrs in a trunk car.....

My buddy does 145's in the kick in a Corolla trunk with 2 cvr 12's in a prefab and a 2500.1 :laugh:

cocoleveo7686
10-09-2007, 03:22 PM
no keep the L7s.......get a 4.0-4.5cf if it will fit tune it to around 35-37hz
and then push around 1200-1500 rms to the pair if u arent allready and u should be in the 143-145 range

yea but tunning to 35-37 hz is a little high for daily isnt it? i thought it was better to tune to like 34hz



yoru dimentions of 35Wx14Hx22D are good right? I mean not only will the box physicaly fit that space, but you will be able to get it into the trunk? I dont really have anything going on (currently unemployed) I'll desighn a box for ya.... hell, your in Mass.... I'm in CT now, let me know where your at, maybe I can even give you a hand making it (if ya wanted to come here)


yea man that sounds cool...i was thinking of building 2 2.0CU boxes to that way it would be easier to get in and out of the trunk...

bdawson72
10-09-2007, 03:24 PM
My buddy does 145's in the kick in a Corolla trunk with 2 cvr 12's in a prefab and a 2500.1 :laugh:

Your friend has a 2500.1 and cvr's.


WOW

KidThump
10-09-2007, 03:43 PM
yuh its basicaly what u would rather have.......if u tune it to 36 or 37 it will be loud and still get low........of course 34hz will get loud too but i have heard the higher tuned a box is the louder it is...

KidThump
10-09-2007, 03:45 PM
My buddy does 145's in the kick in a Corolla trunk with 2 cvr 12's in a prefab and a 2500.1 :laugh:

not daily unless the gains are like all the way down and if hes gonna buy an amp like that why not a better box or better subs

And another thing i dont like when people say my friend has this and that......

Lakota
10-09-2007, 04:40 PM
not daily unless the gains are like all the way down and if hes gonna buy an amp like that why not a better box or better subs

And another thing i dont like when people say my friend has this and that......

Gains are set to where the waves are smooth on the TL's o-scope:) He's waiting for the AQ or DP to be released before he gets rid of his old subs:)

What?

cocoleveo7686
10-10-2007, 09:20 PM
yuh its basicaly what u would rather have.......if u tune it to 36 or 37 it will be loud and still get low........of course 34hz will get loud too but i have heard the higher tuned a box is the louder it is...


yea but if i tune to like 36 it wont be as good for daily driving right? im looking for the BEST tuning for daily and loudness...

DarkFox
10-11-2007, 12:22 AM
you should come here my 1 L7 tuned at 31 in about 3.5 with 1KW. Then decided if you want it more boomy or not and adjust the tunning accordingly. Drops real low and still gets loud. I like it. if you still want to meter a little higher, the 34-36 range sounds good for you.

DarkFox
10-11-2007, 12:24 AM
I think I should stress A LITTLE higher meter, unless you start getting into boxes designed for very small frequency range, your not going to get a large increase, before your SQ goes down the drain. Any well built ported box, designed specificaly for those subs and the room you got, should be alot better then what your running now though.

icweiner
10-11-2007, 12:57 PM
My buddy does 145's in the kick in a Corolla trunk with 2 cvr 12's in a prefab and a 2500.1 :laugh:


so

IgnoreMe
10-11-2007, 01:11 PM
so

exactly.

"so"

the same response your comment about being 4db louder in trunk car deserves. everytime i see that your car meters louder than someone your the first to try and poke fun and say your louder than they are :rolleyes:

cocoleveo7686
10-11-2007, 03:12 PM
I think I should stress A LITTLE higher meter, unless you start getting into boxes designed for very small frequency range, your not going to get a large increase, before your SQ goes down the drain. Any well built ported box, designed specificaly for those subs and the room you got, should be alot better then what your running now though.

yea thats true, let me know when your available, we can set up a time and everything to do the box if youd still like...

DarkFox
10-11-2007, 10:30 PM
Like I said, un-employed.. lol. I just ordered 2 L7's for my stang as well so I was about to be in there messing with win ISD anyway. I'll post some info when I get something done. I'm busy the weekend of the 20th but any weekend after that is avaiable, as well as most week days.

shavenblazer
10-11-2007, 10:32 PM
well i got metered on the audio control i hit 140.6 db's... i have 2 12" Kicker L7's with a hifonics bxi2006d... im kinda shocked at the score, but the last time on a termlab i hit 135 at the kick panel...right now i have a Nolte audio, or as some popel might know Powered 4 sound box that is in the trunk, i dont know if i should get a new box, i was thinking a little bigger, but its going in a nissan sentra let me know what you guys think would help

FAIL

icweiner
10-11-2007, 10:32 PM
exactly.

"so"

the same response your comment about being 4db louder in trunk car deserves. everytime i see that your car meters louder than someone your the first to try and poke fun and say your louder than they are :rolleyes:

well arent you just a perfect perfect person. so, so does everybody else. or they go "weak" or FAIL. i am no diff.

icweiner
10-11-2007, 10:38 PM
FAIL

see told ya

DarkFox
10-11-2007, 10:56 PM
Hey not everyone!!! I offered to help. :angel:

cocoleveo7686
10-11-2007, 11:43 PM
Hey not everyone!!! I offered to help. :angel:

yea this guys the man, hes going to help me build a box hopefully sometime soon...







FAIL


u find me alot of other sentra's that hit 140+ its hard in this car trust me...i guarentee if i had a suv id have a bigger box and be hitting 145, i definately have enough power for these subs i think the box is the problem, im thinking to tuning to like 34Hz at 4 CU does anyone think that will be enough thats all the space i have....im not looking for just loud on the meter, im looking for loud to the ear too...cause mine is loud right now, makes ur ears ring, but i want more...

shavenblazer
10-11-2007, 11:48 PM
u find me alot of other sentra's that hit 140+ its hard in this car trust me...i guarentee if i had a suv id have a bigger box and be hitting 145, i definately have enough power for these subs i think the box is the problem, im thinking to tuning to like 34Hz at 4 CU does anyone think that will be enough thats all the space i have....im not looking for just loud on the meter, im looking for loud to the ear too...cause mine is loud right now, makes ur ears ring, but i want more...[/QUOTE]


140 on ac is quiet 140 on tl aint 2 quiet.Mine does hair tricks:D

PwnMaster
10-11-2007, 11:50 PM
140 on AC is fail.

a single 8 with 50rms can do this. Seriously.

Give up.

DarkFox
10-11-2007, 11:51 PM
I'm working on the box right now. hardest part is that once you subtract for port volume displacement and woofer displacement, theres not too much space left. looking like something around this:
3.7 cu ft (after all displacements) tuned to 35 hz with with 62.5 cubic in of port area

DarkFox
10-11-2007, 11:52 PM
i really want to see the car that does 140's with a single 8 and 50w rms. Please link

PwnMaster
10-11-2007, 11:54 PM
i really want to see the car that does 140's with a single 8 and 50w rms. Please link

Thats only 135ish on TL.

THATS NOT LOUD!!!!!!!

cocoleveo7686
10-11-2007, 11:54 PM
I'm working on the box right now. hardest part is that once you subtract for port volume displacement and woofer displacement, theres not too much space left. looking like something around this:
3.7 cu ft (after all displacements) tuned to 35 hz with with 62.5 cubic in of port area


ill remeasure again tomorrow and see if i can go a little bigger...


i dunno why everyone is sayin its not loud, if you heard my system you would htink its louder, my windshield flexes...not saying its the loudest system, but it sounds good...i bet half you havent sitten in a sentra spec with a system and heard it with over 140 dbs enless they have alot of subs

cocoleveo7686
10-11-2007, 11:57 PM
Thats only 135ish on TL.

THATS NOT LOUD!!!!!!!


no its not, its only 1-2 dbs differnce, when i had my last amp it was a ma audio hk-897 and it said it was 1200 rms but it wasnt...i hit 135 at the kick panel on the termlab...then i upgraded to a hifonics bxi2006d and i got metered at the seat with the car off

shavenblazer
10-11-2007, 11:59 PM
no its not, its only 1-2 dbs differnce, when i had my last amp it was a ma audio hk-897 and it said it was 1200 rms but it wasnt...i hit 135 at the kick panel on the termlab...then i upgraded to a hifonics bxi2006d and i got metered at the seat with the car off

Its more than 1-2 dbs off i have a TL.

PwnMaster
10-12-2007, 12:02 AM
no its not, its only 1-2 dbs differnce, when i had my last amp it was a ma audio hk-897 and it said it was 1200 rms but it wasnt...i hit 135 at the kick panel on the termlab...then i upgraded to a hifonics bxi2006d and i got metered at the seat with the car off

:bsflag:


AC is around ~5-8dbs higher than TL.

Also Kick and Seat(Watever this maybe) is 2 WAY different things.

Kick is gonna be louder 99.9% of teh times.

cocoleveo7686
10-12-2007, 12:11 AM
:bsflag:


AC is around ~5-8dbs higher than TL.

Also Kick and Seat(Watever this maybe) is 2 WAY different things.

Kick is gonna be louder 99.9% of teh times.

how would it explain me getting 135 dbs of a amp that was puttin out like 800rms to a amp that is putting out close to 2000rms and only 140 on the AC

well when they did it with the AC they had my doors open, and he put the mic on my seat and it moved around..., he didnt put it in the kick panel

PwnMaster
10-12-2007, 12:16 AM
how would it explain me getting 135 dbs of a amp that was puttin out like 800rms to a amp that is putting out close to 2000rms and only 140 on the AC

well when they did it with the AC they had my doors open, and he put the mic on my seat and it moved around..., he didnt put it in the kick panel

Your Hifonics amp isnt doin 2000rms either.

Im telling you. AC is not that close to a tl.


DONT CARE about what you say.

IT HAS been tested a millon times, I doubt this one time is different from u.

You cant compare to 2 different locations, on 2 different amps, and adspect to even think of gettin results.

DarkFox
10-12-2007, 12:47 AM
From back in the day i was told (havent verifyed this myself but seems to fit what you got) that unless you were grossly underpowering your subs before, if nothing else changes and you add 1,000W its only gonna give you about a 3db gain.

Sorta makes sence. Your box isnt getting more efficient, and your not adding more cone space. your just moving the same subs just a little more then you were before.

cocoleveo7686
10-12-2007, 12:55 AM
From back in the day i was told (havent verifyed this myself but seems to fit what you got) that unless you were grossly underpowering your subs before, if nothing else changes and you add 1,000W its only gonna give you about a 3db gain.

Sorta makes sence. Your box isnt getting more efficient, and your not adding more cone space. your just moving the same subs just a little more then you were before.

yea but you should also hear a 3 db difference...it sounds much louder now than it ever did, and i bet this amp is putting out close to 1600 rms...i just bought a hifonics xx-hercules, so that SHOULD put 2000 rms cause its at 12.5 V rating, mine sits around 13.0-13.8

i think i might try and build 2 boxes, both 2.0 cu or bigger tuned to around 33-34 hz and if i dont like that, would i be better off selling the 2 12's and getting 1 12 that will handle 2000 rms and have good spl and sq? would it be louder since the box would be more proper for a 12

DarkFox
10-12-2007, 12:59 AM
with 2 boxes you waste alot of air space in the middle (all the 3/4" wood) and then again with both of the porting being seperate, I got a desighn up now, gonna take about 30 min to get it in paint I think.

cocoleveo7686
10-12-2007, 01:04 AM
with 2 boxes you waste alot of air space in the middle (all the 3/4" wood) and then again with both of the porting being seperate, I got a desighn up now, gonna take about 30 min to get it in paint I think.

ok cool, what im goin to do is a take a picture of my trunk tomorrow, and take measurements because i know i have more than 4.0 cubes but the trunk is thinner at the wheel wells sent me your email or i could always post it up on here...

DarkFox
10-12-2007, 01:28 AM
http://img162.imageshack.us/img162/1572/cocoboxpm4.png

PwnMaster
10-12-2007, 01:34 AM
What kinda electical upgrades do you have?

DarkFox
10-12-2007, 01:36 AM
dont feel like going in and chaning it but the effective port lengths are 18.75 and 11.25, though all the cuts are the same, I got it wrong in the pic.... I used paint and 1/2 an hour.. meh.

cocoleveo7686
10-12-2007, 01:39 AM
will 3.66 cubes be enough for 2 12's or should i just build a box and put 1 of my 12's in it...i dont have alot of space to work with which sux

and i have a stock 110A alternator, big 3 in 0 gauge, and a yellowtop up front...

PwnMaster
10-12-2007, 01:40 AM
will 3.66 cubes be enough for 2 12's or should i just build a box and put 1 of my 12's in it...i dont have alot of space to work with which sux

3.66 Can be enough.

Do you have pics of your current box?

Also, your in a trunk right?

DarkFox
10-12-2007, 01:44 AM
3.66 will work, the main thing is your loosing some off your low end, but the box has a good gain and nice decent. I usualy try to get the cutoff freq lower but you should be all right.



http://img299.imageshack.us/img299/2950/boxplotij2.png

PwnMaster
10-12-2007, 02:18 AM
3.66 will work, the main thing is your loosing some off your low end, but the box has a good gain and nice decent. I usualy try to get the cutoff freq lower but you should be all right.



http://img299.imageshack.us/img299/2950/boxplotij2.png

THAT graph means nothing inside a car.

Im sorry.

DarkFox
10-12-2007, 11:07 AM
That graph means nothing??? Thats one of the most important things man. YES, your car changes some of the acoustical response properties, but this graph is how the box itself responds. If you have a bad design from the start, it doesn't matter what car its going in.
This graph shows the box gives a smooth transition to the gain and to the decent slope. There is no odd peaks. Over all this box should be a little on the boomy side (not dropping as low as a SQ setup) but should be good sound and plenty loud for daily driving. You need to play with programs like this Pwnmaster, research the T/S parameters yourself, try some different enclosures in theory in the program, then build them yourself IRL to see how they respond to how you thought they would. Once you have done that, and have some actual information to contribute, (not just flaming this guy and everyone who tries to help him,) then come back and post in here. The way your going, your going to have a short life on these forums. Moderators don't take too kindly to people who never actually try to help, and just make problems in legitimate posts, with antagonistic responses.

cocoleveo7686
10-12-2007, 11:23 AM
3.66 will work, the main thing is your loosing some off your low end, but the box has a good gain and nice decent. I usualy try to get the cutoff freq lower but you should be all right.



http://img299.imageshack.us/img299/2950/boxplotij2.png


thanks for all the help...now what if i tune to between 32-34 will that work better? i dont meter alot...once in a great while, its mostly for daily, but i want something real loud

DarkFox
10-12-2007, 11:27 AM
the problem is that the box is already pretty small. When you try to tune lower, you need to add length to the port. Length that subtracts more from the box volume. Larger box volumes make the subs move easier and the box more efficient, also, are much better suited for low frequencies.

Basically what I am getting at here is with the size and tuning its at now, you have pretty much reached a point of diminishing returns. To tune lower, you need longer port, takes more space, makes box smaller, cutting down your efficiency, making you not as loud. Make sense?

DarkFox
10-12-2007, 11:53 AM
This should make it alot easier to understand what I am getting at.

http://img251.imageshack.us/img251/3357/compareqe9.png





Here you can see three plots.
The first plot (blue)(yours) starts its cutoff at about 35 Hz and has a max gain of about 2.2DB in the 62hz area with about a medium width peak. (slightly boomy in those freq.)

The second plot (yellow) is tuned a little lower in the space you got, resulting in a slightly smaller box also. you see even though it is tuned lower, 32hz, it actualy starts to cutoff before the first box. (this one is about 36.5). It has a max gain also of only about 1.6 and has a slightly wider peak, which would be slitly less boomy (though not as loud and not drop as low)

The third one is what I would idealy go for (I enjoy the more the SQ then the spl, though when I can I go for both.) This one is tuned to 31 HZ but because we also have box volume working for us its cutoff begins around 28 HZ. Its max gain is in fact only about 1.3 but has a very wide peak, so the sound will be smooth across that large elevated range, and the peak is also around 48HZ. Resulting in a box that will sound much louder in the low range bass. 12's dont have any problem in that mid range bass, so I'm not concerned there anyway. In a Ideal world, this is what I would go for.

EDIT: i realize that third box is hard to see, its 6.5 cubic feet

ballstothewall
10-12-2007, 11:55 AM
*edit*

Didn't read correctly...

cocoleveo7686
10-12-2007, 02:04 PM
This should make it alot easier to understand what I am getting at.

http://img251.imageshack.us/img251/3357/compareqe9.png





Here you can see three plots.
The first plot (blue)(yours) starts its cutoff at about 35 Hz and has a max gain of about 2.2DB in the 62hz area with about a medium width peak. (slightly boomy in those freq.)

The second plot (yellow) is tuned a little lower in the space you got, resulting in a slightly smaller box also. you see even though it is tuned lower, 32hz, it actualy starts to cutoff before the first box. (this one is about 36.5). It has a max gain also of only about 1.6 and has a slightly wider peak, which would be slitly less boomy (though not as loud and not drop as low)

The third one is what I would idealy go for (I enjoy the more the SQ then the spl, though when I can I go for both.) This one is tuned to 31 HZ but because we also have box volume working for us its cutoff begins around 28 HZ. Its max gain is in fact only about 1.3 but has a very wide peak, so the sound will be smooth across that large elevated range, and the peak is also around 48HZ. Resulting in a box that will sound much louder in the low range bass. 12's dont have any problem in that mid range bass, so I'm not concerned there anyway. In a Ideal world, this is what I would go for.

EDIT: i realize that third box is hard to see, its 6.5 cubic feet

so you think im better off tuning to like 31 hz instead of 35?

DarkFox
10-12-2007, 07:21 PM
no, only if you have the air space to back it up, notice the one tuned to 31 hz (the white plot) is showing it in a 6.5 cubic foot box

icweiner
10-13-2007, 12:46 PM
ill remeasure again tomorrow and see if i can go a little bigger...


i dunno why everyone is sayin its not loud, if you heard my system you would htink its louder, my windshield flexes...not saying its the loudest system, but it sounds good...i bet half you havent sitten in a sentra spec with a system and heard it with over 140 dbs enless they have alot of subs

ur a tard

IgnoreMe
10-13-2007, 01:00 PM
well arent you just a perfect perfect person. so, so does everybody else. or they go "weak" or FAIL. i am no diff.

i never said i was perfect, its just that you always tell people "im louder with less equipment haha" and **** like that.

your doing good for the equipment you have. try to be a little humble

icweiner
10-13-2007, 01:15 PM
i never said i was perfect, its just that you always tell people "im louder with less equipment haha" and **** like that.

your doing good for the equipment you have. try to be a little humble

ok thanks. i actually need to shoot a video of my cheap little setup hmmmm. also OP i wouldnt do less than 4 cubes for those l7's. i would sell them and put one 15 in there n the biggest box you can.:)

edit sry i meant l7's

DarkFox
10-13-2007, 01:55 PM
Who is OP and who has r's?

snb778
10-13-2007, 02:03 PM
Yeah get a 12 inch Mt

A member on here has 1 and is hitting 147 db with 3krms on TL

or Get a Fi BTL

WOW is there ever an FI-BTL boner on here!! What happened to the Almighty SI MAG!! That is where its at! or the TC3000

IgnoreMe
10-13-2007, 02:04 PM
Who is OP and who has r's?

op = original poster

DarkFox
10-13-2007, 02:07 PM
thanks ignoreme, was just wondering if he had mixed up threads when he was talking about the R's

DarkFox
11-02-2007, 03:41 PM
hey cocoleveo7686, any updates? sorry I have not answered anything in a while, been busy with my own system the last 2 weeks, also, I built a pretty similar box to what your looking at (not by mesurements but by volume and tunning, and am also running the same subs and amp. have a look:
http://www.caraudio.com/forum/showthread.php?t=266206
let me know what you want to do, still willing to help.

cocoleveo7686
11-02-2007, 04:08 PM
yea man i still want help, i dont know if maybe i should go with 1 of my 12's in a 3.2 CU box with 1000 rms to it instead of the 2, since the L7's require alot of space...either that, or get 1 RE XXX or MX and put like 2000 rms on it in a right enclosure, i think the with space i have isnt enough for my 2 12's so im not getting full potential, i want louder

DarkFox
11-02-2007, 04:30 PM
well I happen to have 1 12" l7 in 3.5 tuned to 31 @ 1000w, and I have 2 12' L7 in about 4.9 tuned to 34 hz @ 2000w. so if you want to have a listen at either I am here.

cocoleveo7686
11-03-2007, 12:47 AM
well I happen to have 1 12" l7 in 3.5 tuned to 31 @ 1000w, and I have 2 12' L7 in about 4.9 tuned to 34 hz @ 2000w. so if you want to have a listen at either I am here.

well do you think if i put 1 12 L7 in that box it would be louder then my setup since its in a bigger box, too bad ur not going to beable take the 4.9 Cu one, id liek to see if that would fit...lol

DarkFox
11-03-2007, 11:36 AM
I can tell you that the sound quality in the single is a little better but the dual is MUCH louder. I should note its also hard to judge the SQ of the the double, as it is unfinished and EVERYTHING rattles atm. If i remember right, your chief complaint was that you wanted louder on the meter anyway, and as a daily driver you didnt think it was too bad??? Let me know if that was wrong. But if thats the case, I think going to one sub unless its a specific SPL enclosure, isnt going to get you a better meter.

15nissen
11-05-2007, 02:09 PM
no keep the L7s.......get a 4.0-4.5cf if it will fit tune it to around 35-37hz
and then push around 1200-1500 rms to the pair if u arent allready and u should be in the 143-145 range

stop giving advice. I read this thread, and no one knows what they are talking about. Its all in the install. I had a SINGLE 15 cvx that did a 148.7 in the kick, tuned low, i peaked at 42hz. That was in a sentra trunk car too. Its all in the install to be exact. I do not care if its a suv, trunk car etc.....you can make anything loud if you know what your doing.

Just stuffing the biggest box in a trunk will hurt you. You must have room to move air. The box its self will choke off air movement and hurt you.

In the sentra have the sub / subs firing into cabin and port to passenger side. Design the box so that it doesnt cover the whole opening into the cabin when you fold the seats down. Or dont be cheap and go with aero ports, they = loud.

cocoleveo7686
11-05-2007, 02:21 PM
stop giving advice. I read this thread, and no one knows what they are talking about. Its all in the install. I had a SINGLE 15 cvx that did a 148.7 in the kick, tuned low, i peaked at 42hz. That was in a sentra trunk car too. Its all in the install to be exact. I do not care if its a suv, trunk car etc.....you can make anything loud if you know what your doing.

Just stuffing the biggest box in a trunk will hurt you. You must have room to move air. The box its self will choke off air movement and hurt you.

In the sentra have the sub / subs firing into cabin and port to passenger side. Design the box so that it doesnt cover the whole opening into the cabin when you fold the seats down. Or dont be cheap and go with aero ports, they = loud.

i dont think by firing the subs into the cabin will make it louder in this car...im not looking to really be louder by the meter, mostly to the ear...i dont think i have enough space for 2 12's so i was thinking it might be louder if i put in 1 good 12 or 2 10's

DarkFox
11-05-2007, 02:26 PM
stop giving advice. I read this thread, and no one knows what they are talking about. Its all in the install. I had a SINGLE 15 cvx that did a 148.7 in the kick, tuned low, i peaked at 42hz. That was in a sentra trunk car too. Its all in the install to be exact. I do not care if its a suv, trunk car etc.....you can make anything loud if you know what your doing.

Just stuffing the biggest box in a trunk will hurt you. You must have room to move air. The box its self will choke off air movement and hurt you.

In the sentra have the sub / subs firing into cabin and port to passenger side. Design the box so that it doesnt cover the whole opening into the cabin when you fold the seats down. Or dont be cheap and go with aero ports, they = loud.

pretty harsh dude..... I agree, alot of the stuff you say is 100% right, but to say no one knows what there talking about exept you... Ouch.
however:

In the sentra have the sub / subs firing into cabin and port to passenger side. Design the box so that it doesnt cover the whole opening into the cabin when you fold the seats down. Or dont be cheap and go with aero ports, they = loud.
seems to be sound advice from somone experienced with a sentra and on team kicker to boot. Sounds like good advice to me. but what do I know, I had a previous post in this thread, so as the team kicker god here says,


no one knows what they are talking about.

15nissen
11-05-2007, 02:35 PM
pretty harsh dude..... I agree, alot of the stuff you say is 100% right, but to say no one knows what there talking about exept you... Ouch.
however:

seems to be sound advice from somone experienced with a sentra and on team kicker to boot. Sounds like good advice to me. but what do I know, I had a previous post in this thread, so as the team kicker god here says,

didnt mean to come off harsh:crap:. I just erks me when people give advice with very limited knowledge. If ive never used something i can not comment on it. In this case ive used everything he is working with and can offer a valid opinion.

I will try to find pic's of the sentra install and post them for reference. :)

DarkFox
11-05-2007, 02:36 PM
actualy sounds like your sugesting something close to what I am doing in my stang right now. i'll get a pic of that too

DarkFox
11-05-2007, 02:39 PM
didn't add the resin or trim the fabric yet, but you get the idea.
http://img67.imageshack.us/img67/1879/s5000596tr0.jpg

15nissen
11-05-2007, 02:44 PM
didn't add the resin or trim the fabric yet, but you get the idea.
http://img67.imageshack.us/img67/1879/s5000596tr0.jpg

looks like a good work in progress. I would resin the inside of the box as well. The box that was in my sentra was 4 cube with internal aero ports. It would slide out in case i needed to change a flat etc.....i put alot of different boxes from 2x 12's, to single 15's and did a 146.2 with a kenwood amp that clamped to 414 actual watts:verymad: in the kick.

cocoleveo7686
11-05-2007, 03:20 PM
i would rather be louder to the ear then to the mic

cocoleveo7686
11-05-2007, 03:21 PM
looks like a good work in progress. I would resin the inside of the box as well. The box that was in my sentra was 4 cube with internal aero ports. It would slide out in case i needed to change a flat etc.....i put alot of different boxes from 2x 12's, to single 15's and did a 146.2 with a kenwood amp that clamped to 414 actual watts:verymad: in the kick.

you really think its much louder to the ear if you turn the box around firing the subs forward? i was htinking about trying to build a box to 4.0 CU, but i will just barely have enough room i think

15nissen
11-05-2007, 05:24 PM
you really think its much louder to the ear if you turn the box around firing the subs forward? i was htinking about trying to build a box to 4.0 CU, but i will just barely have enough room i think

it was louder to the ear and metered better. sub firing into cabin, and port to passenger side.

Lakota
11-05-2007, 10:49 PM
i would rather be louder to the ear then to the mic

Loud on the mic usually is pretty **** loud to the ear. You can tell the difference between high and low sound pressure.

cocoleveo7686
11-06-2007, 12:11 AM
it was louder to the ear and metered better. sub firing into cabin, and port to passenger side.



well i have a box like the one picture up above, i will turn the box around, but i dont think its going to be much louder...usually with it facing the trunk has been louder in most cars ive had