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Montana
09-23-2012, 06:22 AM
I once upon a time stumbled across a video of someone running dual 12s in a "walled trunk"
They claimed it seals better and gives better SPL, or something of the matter.


What's the down-low on a walled trunk in a sedan.

CAT MAN
09-23-2012, 06:38 AM
i told you. same thing. i can give you a few tips if you need. here are some pics of the old wall


used tape to form the foam
https://fbcdn-sphotos-f-a.akamaihd.net/hphotos-ak-ash4/403907_433832163318104_2098581292_n.jpg




here without tape after foam


https://fbcdn-sphotos-f-a.akamaihd.net/hphotos-ak-ash3/s720x720/532362_434820986552555_1065963131_n.jpg








now the port in ANY trunk wall i feel should be on the drivers side. my new box (i dont have pics of it in) is alot louder with the port on the drivers side meter and ear wise.




alot of port area will come in handy. the best way to seal it is spray foam AKA great stuff in a red can. The black can is better but not for a new guy. ive found out the hard way.

CAT MAN
09-23-2012, 06:42 AM
also here is one more thing you COULD run into in expensive 2 door cars.

https://fbcdn-sphotos-e-a.akamaihd.net/hphotos-ak-ash3/574985_414889325212388_2136535531_n.jpg




lexus acura mercedes some fords etc have this brace. DO NOT CUT! it will unbolt.

VisceralSound
09-23-2012, 06:50 AM
Anton Miller (Local in MN) swears that sub front (facing cabin) and port firing to the side on the drivers side sounds the best, and I tend to agree with him.

IE my box tuned to 33hz
http://i169.photobucket.com/albums/u235/tarukogfx/20120722_170314.jpg

in the car:
http://i169.photobucket.com/albums/u235/tarukogfx/20120722_173720.jpg

**AFAIK*But in relation to walling it, I believe it will act like a "Bandpass" within the cabin of the car so it may be louder with the windows down so if you compete take that into consideration of what org. you're in.

CAT MAN
09-23-2012, 06:52 AM
Anton Miller (Local in MN) swears that sub front (facing cabin) and port firing to the side on the drivers side sounds the best, and I tend to agree with him.

IE my box tuned to 33hz
http://i169.photobucket.com/albums/u235/tarukogfx/20120722_170314.jpg

in the car:
http://i169.photobucket.com/albums/u235/tarukogfx/20120722_173720.jpg
antons cavilier is nasty. Some cars arent made for walls. some are. I would have done subs up port back or side if i had the space. walled it because i didnt and it woiked very well. it depends on the application. design. and the person using it. i bet anton would gain subs up port rear. but who knows. :p

CAT MAN
09-23-2012, 06:54 AM
also if it isnt 100% sealed. its not worth doing(i mean even MM of space). VS what was your last wall? single walled 15s never do well. 2 12s or 2 15s are what work well in walls.

VisceralSound
09-23-2012, 06:57 AM
antons cavilier is nasty. Some cars arent made for walls. some are. I would have done subs up port back or side if i had the space. walled it because i didnt and it woiked very well. it depends on the application. design. and the person using it. i bet anton would gain subs up port rear. but who knows. :p
I haven't seen his process but he's said he's tried "all" variations and sub forward port side meters best in his car, so far on **** electrical I can get a 144@40hz off like <1000watts (not having ever clamped would be my guess) :)

CAT MAN
09-23-2012, 06:58 AM
I haven't seen his process but he's said he's tried "all" variations and sub forward port side meters best in his car, so far on **** electrical I can get a 144@40hz off like <1000watts (not having ever clamped would be my guess) :)
147s on 14xx clamped nspl hardcore lol... 36hz maybe i did something just right :dontknow:

VisceralSound
09-23-2012, 07:00 AM
147s on 14xx clamped nspl hardcore lol... 36hz maybe i did something just right :dontknow:

Once I get an H/O alt/after market battery under the hood I hope to put this Crescendo3KWP to better use and hopefully meter louder too;

so far on music I can get (highest I've seen so far for me) 131 @12" out the window on music.

CAT MAN
09-23-2012, 07:02 AM
Once I get an H/O alt/after market battery under the hood I hope to put this Crescendo3KWP to better use and hopefully meter louder too;

so far on music I can get (highest I've seen so far for me) 131 @12" out the window on music.idk what my 12'' score or PnP score is...
my 3k popped again (bad transistor causing all this poo.) or id let you guys see what im doing now.....FUUU

VisceralSound
09-23-2012, 07:04 AM
idk what my 12'' score or PnP score is...
my 3k popped again (bad transistor causing all this poo.) or id let you guys see what im doing now.....FUUU
Don't lie, you're quiet c: I'm wanting to try and trade/sell off my Zv2 for 2-3 XCON/ICON 10's and try that out, I've always run single 12's/15's I figure I'll try multiple 10's

CAT MAN
09-23-2012, 07:05 AM
Don't lie, you're quiet c: I'm wanting to try and trade/sell off my Zv2 for 2-3 XCON/ICON 10's and try that out, I've always run single 12's/15's I figure I'll try multiple 10's

wont be for long. 5-6k is coming as soon as i get done with finals and can rebuild. already talked to some teammates about dropping out for state/world finals as much as it pains me i might have to. i have no amp. and sold the ap before i should have..... i could have at least qualified for s3 :crap:

VisceralSound
09-23-2012, 07:07 AM
wont be for long. 5-6k is coming as soon as i get done with finals and can rebuild. already talked to some teammates about dropping out for state/world finals as much as it pains me i might have to. i have no amp. and sold the ap before i should have..... i could have at least qualified for s3 :crap:

Too bad you're not local, but I would have suspected a teamate could have loaned you an amp no?

CAT MAN
09-23-2012, 07:10 AM
Too bad you're not local, but I would have suspected a teamate could have loaned you an amp no?

Brandons 1.2k that would put me in s2. or his brandx 8k that will put me in xtreme. all the other members have 1200 watt amps as well....... i nees a rated 1500 lol.. or it moves my class for world finals. eff it im not too worried. I cant believe out of the 4 sponsors i have. none will loan me an amp or 100$ to grab an ap LOL...

VisceralSound
09-23-2012, 07:13 AM
Brandons 1.2k that would put me in s2. or his brandx 8k that will put me in xtreme. all the other members have 1200 watt amps as well....... i nees a rated 1500 lol.. or it moves my class for world finals. eff it im not too worried. I cant believe out of the 4 sponsors i have. none will loan me an amp or 100$ to grab an ap LOL...

Shits tough, NESPL yeah? it ***** that they must go by amp rating then, MWSPL you can have an 8k amp but have it clamped during your run to make sure you don't go over say 3k.

CAT MAN
09-23-2012, 07:15 AM
Shits tough, NESPL yeah? it ***** that they must go by amp rating then, MWSPL you can have an 8k amp but have it clamped during your run to make sure you don't go over say 3k.

actually its MECA they go by fusing x10 and cone area OR max power divided by 2 and cone area. nspl is my fool around org :p

VisceralSound
09-23-2012, 07:22 AM
actually its MECA they go by fusing x10 and cone area OR max power divided by 2 and cone area. nspl is my fool around org :p

Lame I hate restrictions like that;

MWSPL has more of a "real time/daily" metering style afaik, you can play Sealed up, or (like a normal demo on a normal day) have your windows/doors open which I like because I meter louder with my driver and passenger windows open.

CAT MAN
09-23-2012, 07:23 AM
Lame I hate restrictions like that;

MWSPL has more of a "real time/daily" metering style afaik, you can play Sealed up, or (like a normal demo on a normal day) have your windows/doors open which I like because I meter louder with my driver and passenger windows open.

nspl trunk hardcore is in the kick door open 0-1800 goes by clamped power sealed. i did a 142 or some crap. i hated my last box lol new one is good. still not enough port for sealed. my car acts weird sealed period.

VisceralSound
09-23-2012, 07:24 AM
nspl trunk hardcore is in the kick door open 0-1800 goes by clamped power sealed. i did a 142 or some crap. i hated my last box lol new one is good. still not enough port for sealed. my car acts weird sealed period.
/Agreed

Didn't some guy do like 161.x or 160.1 out the trunk in nspl recently

CAT MAN
09-23-2012, 07:25 AM
/Agreed

Didn't some guy do like 161.x or 160.1 out the trunk in nspl recently

terry brocks. he did a 56xx on 2 12 inch xfl's lol... he is a beast. i wont even try to understand how he does it

VisceralSound
09-23-2012, 07:28 AM
terry brocks. he did a 56xx on 2 12 inch xfl's lol... he is a beast. i wont even try to understand how he does it

Anton is close, he's pushing 152ish[I think at one point did a 52 manned/AND sealed in the cavi. (still far from 160 but he's got vision and drive to do what he needs to do and tests the **** out of everything)

keep_hope_alive
09-23-2012, 11:26 AM
my trunk wall:

two layers 3/4" MDF with 1/4-20 T-nuts inset
http://i38.photobucket.com/albums/e128/phat_funky_beats/Accord%202009/0610trunkIBwall/accordtrunk_IBwall011.jpg

secured/sealed with silicone, fiberglass, and bondo
http://i38.photobucket.com/albums/e128/phat_funky_beats/Accord%202009/0610trunkIBwall/accordtrunk_IBwall_fg005-1.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/Accord%202009/0610trunkIBwall/accordtrunk_IBwall_fg001-2.jpg

BXTII
http://i38.photobucket.com/albums/e128/phat_funky_beats/Accord%202009/0610trunkIBwall/accordIBwall022.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/Accord%202009/0610trunkIBwall/accordIBwall038.jpg

carpet for aesthetics
http://i38.photobucket.com/albums/e128/phat_funky_beats/Accord%202009/0610trunkIBwall/accordIBwall045.jpg

baffle wall - 3/4" MDF coated in resin with T-nuts (higher power would have yielded two layers)
http://i38.photobucket.com/albums/e128/phat_funky_beats/Accord%202009/0610trunkIBwall/accordtrunk_IBwall_finish006.jpg

foam seals
http://i38.photobucket.com/albums/e128/phat_funky_beats/Accord%202009/0610trunkIBwall/accordtrunk_IBwall_finish012.jpg

final
http://i38.photobucket.com/albums/e128/phat_funky_beats/Accord%202009/0610trunkIBwall/accordtrunk_IBwall_finish027.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/Accord%202009/AccordTweeters005.jpg


the trunk undulations didn't allow for a good seal - so i made a rectangular opening. the baffle wall is removable so i can experiment with different subs. the same concept could be applied to a box that had a flange to bolt up.


rear deck is sealed with over 5 layers of deadener (some top, some bottom). I will eventually make a new 3/4" MDF top that increases rigidity further.

CAT MAN
09-23-2012, 11:28 AM
Love you rich...your stuff is amazing

keep_hope_alive
09-23-2012, 11:32 AM
Love you rich...your stuff is amazing

thanks. it's just time, some experimentation, more time, a little bit of money, more experimentation, and more time.

CAT MAN
09-23-2012, 11:32 AM
thanks. it's just time, some experimentation, more time, a little bit of money, more experimentation, and more time.

you need to come over here one day. we could do the ultimate legit IB setup. :)

keep_hope_alive
09-23-2012, 11:55 AM
you need to come over here one day. we could do the ultimate legit IB setup. :)

"legit IB" is a misnomer. "IB" doesn't exist in any vehicle.

"TB" or trunk baffle is more apt.

the time required restricts them to DIY. the Scion tC build is the most time i have ever put into a car that wasn't mine. my wife was not thrilled. :)

the new SPL build i'm doing will likely be the second larges time commitment for someone else. but we've been friends since 1989.

CAT MAN
09-23-2012, 12:40 PM
"legit IB" is a misnomer. "IB" doesn't exist in any vehicle.

"TB" or trunk baffle is more apt.

the time required restricts them to DIY. the Scion tC build is the most time i have ever put into a car that wasn't mine. my wife was not thrilled. :)

the new SPL build i'm doing will likely be the second larges time commitment for someone else. but we've been friends since 1989.
there is a true IB setup. we discussed it once before if you remember :)

keep_hope_alive
09-23-2012, 12:56 PM
there is a true IB setup. we discussed it once before if you remember :)

ah yes.

i think if you had a van and left the rear open, that would count.

i will likely add venting to the trunk, and also add some absorption to the trunk lid to absorb some bass in the trunk (to reduce cancellation through the woofer cones). that is the biggest issue with IB in a car - the woofer cone is the path for rear wave reflections.

Montana
09-23-2012, 02:54 PM
So, a walled trunk is just your box pushed all the way up against the back seats , as far as they will anyway, and sealing it off from the rest of the trunk? pushing all air into the cabin giving it a hatchback effect?

Chriszle
09-23-2012, 03:19 PM
I've heard that if your box is louder rear firing, you will put up better numbers firing forward sealed. If your box is louder forward firing unsealed than rear firing unsealed, then you will lose by sealing firing forward.

CAT MAN
09-23-2012, 07:23 PM
So, a walled trunk is just your box pushed all the way up against the back seats , as far as they will anyway, and sealing it off from the rest of the trunk? pushing all air into the cabin giving it a hatchback effect?correct. some walls can be further back. but most need to be as far up as they can


I've heard that if your box is louder rear firing, you will put up better numbers firing forward sealed. If your box is louder forward firing unsealed than rear firing unsealed, then you will lose by sealing firing forward.i have no clue where you got this.

filtor1
09-23-2012, 07:30 PM
FWIW, I got my best numbers at my lowest tune and the best experience from a sub stage when I did subs and port forward and sealing the trunk off. I will never fire into a trunk again. The only real way to know what will meet your goals is to build and test. I gained 3+db even after dropping my tuning to 28Hz after forward firing and sealing the trunk off.

CAT MAN
09-23-2012, 07:31 PM
FWIW, I got my best numbers at my lowest tune and the best experience from a sub stage when I did subs and port forward and sealing the trunk off. I will never fire into a trunk again. The only real way to know what will meet your goals is to build and test. I gained 3+db even after dropping my tuning to 28Hz after forward firing and sealing the trunk off.

i love the trunk wall of mine. its MUCH smoother.

filtor1
09-23-2012, 07:36 PM
i love the trunk wall of mine. its MUCH smoother.

I agree 100%. It seemed to smooth out a nasty dip I had and was much easier to blend with my front stage. I wasn't chasing numbers though. I never did get to try another enclosure with a higher tune to see what it could do. I was just too happy to change it.

CAT MAN
09-23-2012, 07:38 PM
I agree 100%. It seemed to smooth out a nasty dip I had and was much easier to blend with my front stage. I wasn't chasing numbers though. I never did get to try another enclosure with a higher tune to see what it could do. I was just too happy to change it.
im at 32 and i had to counteract the low tuning with a smaller box and larger port so i could still at lease halfway have my peak in the 40s but it seemed i dont :crap: oh well

filtor1
09-23-2012, 07:45 PM
im at 32 and i had to counteract the low tuning with a smaller box and larger port so i could still at lease halfway have my peak in the 40s but it seemed i dont :crap: oh well

If you are happy with the way it sounds and it meets your needs for output, no need to do anything. Even the best laid plans act totally different once you get everything installed and playing. Why were you shooting for 40's? Output?

CAT MAN
09-23-2012, 08:07 PM
If you are happy with the way it sounds and it meets your needs for output, no need to do anything. Even the best laid plans act totally different once you get everything installed and playing. Why were you shooting for 40's? Output?

40s for spl and brutality :p

Chriszle
09-23-2012, 08:36 PM
correct. some walls can be further back. but most need to be as far up as they can

i have no clue where you got this.

From Mr. Sears, one of the loudest trunks in the nation I believe.

CAT MAN
09-23-2012, 09:19 PM
From Mr. Sears, one of the loudest trunks in the nation I believe.

Thats odd i just chatted with him. Never said anything like that. :crap:

Chriszle
09-23-2012, 10:14 PM
He posted in on Caco the other day. Of course, its a general rule, and not every single car will follow it.

CAT MAN
09-24-2012, 03:43 AM
He posted in on Caco the other day. Of course, its a general rule, and not every single car will follow it.

thats odd that he would say that. mine ws loud both ways.

BAPEKC
09-24-2012, 07:54 AM
Im going with a trunk wall with 2 15's. Hopefully its efficient!