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View Full Version : best tunning to hit all frequencies



robertoyoung08
11-22-2009, 10:53 PM
built a box for a RE audio mx. and just dropped it into the trunk.

the lows hit real well but other notes dont hit so well.

i got it in a 3.2 cubes at 35hz with aero ports.
it was my first box built so i think it might be that i didnt do such a good job on box.

or should i get it tuned to something else? i have a 12 w3v3 jl in a prefab box and i think that thing was hitting cleaner =(

mmouse57
11-23-2009, 01:27 AM
some subs dont like high bass notes like 100hz up. your jl box can hit a wider range sure as smaller driver/cone and its lighter cone so moves easier so wider range of freq.
if you crossover the box right at 24db crossover at 80hz for sub and 24hz at 80-100hz for mids it should sound sweet and bring your mids bass down to like 80hz could help your sound stage

or try a sealed box

theMessenjah44
11-23-2009, 01:34 AM
subs are for low notes....get some good components for your midbass

fasfocus00
11-23-2009, 01:35 AM
if you're that concerned about a flat response maybe you should go with a sealed enclosure.

basscort2009
11-23-2009, 01:37 AM
size of aeros and how long they are? maybe u tuned it too low by accident

robertoyoung08
11-23-2009, 02:14 AM
thanks for all the help.

yeah, this is my first system (other than just subs) so im not very good at tunning everything yet.

i will look into that for sure, since now that i got it all in i want it to sound as good as possible

my 2 aeros are 4" wide and 15" long. (i built the box a while ago so **** i think i might have forgotten the length. but im pretty sure it was about 15 in length). i had a REALLY hard time finding out what size for aeros. everyone on here gave me diff info and supposedly ever aero calc out there is completely off. idk what wthe exact way to find aero measurements is.

and yeah i got some diamond d6's. but now ive heard that they lack midbass, so it might be the speakers also.

thanks for all the help guys, this actually helped me alot. if you guys got any more help let me know. thanks! il post up a vid and sopme pics of the install. i had a thread going, but it got old after i was having trouble finishing everything up. i guess all i need is some good fine tunning and this thing will be up and running!:D

PV Audio
11-23-2009, 11:36 AM
some subs dont like high bass notes like 100hz up. your jl box can hit a wider range sure as smaller driver/cone and its lighter cone so moves easier so wider range of freq.
if you crossover the box right at 24db crossover at 80hz for sub and 24hz at 80-100hz for mids it should sound sweet and bring your mids bass down to like 80hz could help your sound stage

or try a sealed boxNot true, my friend. Not true. :)

PV Audio
11-23-2009, 11:37 AM
OP, if you still have the design, send it to me and I'll take a look at it. There isn't a reason why you shouldn't be happy with it.

robertoyoung08
11-23-2009, 12:29 PM
thanks for the help.

i dont have a design. i pretty much just got the box put together by drawings. and some help i got on here.

but anyways,

just a regular rectanlge shaped box:

31" length
20" deep
14" height

and two 4" aeros 15" long. the only thing that im thinking could have screwed me up was that i had to use a pvc elbow to make one of the aeros fit.

PIITB Wut Wut
11-23-2009, 12:32 PM
thats a pretty nice size box... i thought those subs liked small boxes?

robertoyoung08
11-23-2009, 12:49 PM
yeah the website suggests like 2 cubes.
but thats very small i would think. some people gave me **** on here saying i was trying to outsmart the manufacture itself by me saying it needed a bigger box. but everyone on here with these subs say they sound better and need bigger boxes. the box is one ft3 more than re audio suggests. they suggest 2.2 at optimal i think. either 2.2 or 2

galacticmonkey
11-23-2009, 01:47 PM
Is it a 12 or a 15?

If its a 12, try 2 cubes @ 38-39hz.

If its a 12, try 4 cubes @ 38-39hz.

statonburrell
11-23-2009, 01:54 PM
Is it a 12 or a 15?

If its a 12, try 2 cubes @ 38-39hz.

If its a 12, try 4 cubes @ 38-39hz.

two different box sizes for 12s, amazing.

DNick454
11-23-2009, 01:54 PM
My guess would be, if it's a 12, then 3.2 cubes isn't crazy, but it's a little larger than optimal. Although big boxes are efficient and can get loud off of less power, they tend to have a larger peak. If your sub+box+car combo just so happens to peak down really low, then that's not helping. Try a smaller net volume tuned slightly higher. Maybe 2.25 cubes @ 36-38Hz. You'll get not only a flatter response and hit the notes up higher a little easier, but you'll have greater power handling on the sub mechanically as well. 3.2 seems a bit big for a 12.

If it's a 15, then 3.2 is small. Need at least 4-5 cubes.

DNick454
11-23-2009, 01:56 PM
Is it a 12 or a 15?

If its a 12, try 2 cubes @ 38-39hz.

If its a 15, try 4 cubes @ 38-39hz.

If its a funky pup, try 13.37 cubes @ awesome Hz


double fixt

supermaxx123
11-23-2009, 04:15 PM
double fixt

lol. tuning seems high for that big of a box. or does it not matter... I dont know anything, im just typing.

mendon mafia
11-23-2009, 04:33 PM
assuming this is a 12 then ur box is simply just to big this explains the nice lows but poor top end.

I used to purposely build my boxes a little big so i could get more low end extension but at the sacrifice of the 80-100hz range. usually only a small decrease tho compared to the gain in the lows.

Currently ive been having a problem with my top end hitting to hard and distorting really bad but thats a different issue.

supermaxx123
11-23-2009, 04:38 PM
assuming this is a 12 then ur box is simply just to big this explains the nice lows but poor top end.

I used to purposely build my boxes a little big so i could get more low end extension but at the sacrifice of the 80-100hz range. usually only a small decrease tho compared to the gain in the lows.

Currently ive been having a problem with my top end hitting to hard and distorting really bad but thats a different issue.

my 15 brahma is in, 4.8cu/ft tuned to 28hz, it seems almost invisible at about the 70hz and above, even 50hz aren't too loud, but the lows are amazing.

mobeious
11-23-2009, 04:44 PM
really need to know what size sub

RE MX 12 has a Fs 23hz so for a fairly flat responce i would do 2cubes @ 27hz that should take the peak out of the bandwidth and give u a even loudness to ur bass
but the sub has 22mm of xmax so be sure to alow atleast 30sq of port

PV Audio
11-23-2009, 08:19 PM
really need to know what size sub

RE MX 12 has a Fs 23hz so for a fairly flat responce i would do 2cubes @ 27hz that should take the peak out of the bandwidth and give u a even loudness to ur bass
but the sub has 22mm of xmax so be sure to alow atleast 30sq of port
As though you know how to design a box or something. :D

Like my sig? :)

mobeious
11-23-2009, 08:20 PM
lol thats nice

robertoyoung08
11-24-2009, 02:00 PM
im getting some really good help here. thanks a lot.
i was having a hard *** **** time finishing my set up and now that all connections are good i want it sounding good.

yeah on my drive to school this morning i listened to different songs, and yeah the box hits the lows really well but not any other notes that my other subs hit easily.

its a 12" RE MX. have a 1500 watt clarion amp going to it, but i have the gain set to only about 1/4, at least while i break this baby in. idk if gain higher would help, but yeah sub is definitely misisng a lot of notes.

3.2 cubes which should be tuned at about 35 hz.

can anyone help me figure out if i did my aero port calculations right, maybe thats whats ****ing the box over. first i want to try to figure that out and if i got the aeros in right then i will get a smaller sized box and see if that works. i should be more happy with a RE mx than a tiny 12" jl w3
=(

it might be in a complete different category, but i have a jbl in my room (home theatre sub) and i love it! its loud and ive heard very fiew songs that it cant reproduce like it should. i wish i could get a box built like that. it ported (aero) so i know its not a sealed thats getting a flatter response.

robertoyoung08
11-24-2009, 02:00 PM
il post a vid today so you guys can hear it. i tried posting one up a few days ago but stupid youtube removed my audio.
il post a vid tonight! thanks for the help !

PV Audio
11-24-2009, 06:40 PM
Before you waste your time with that video, realize that a microphone tcannot pick up that amount of sound pressure without distorting. What that means is, while we can tell the difference in the frequencies, all sounds from your subwoofer will simply sound distorted anyway. Look here:

http://www.youtube.com/watch?v=itBo621lLzw

The W6V2 is one of the best SQ subs money can buy, overpriced or not. That isn't what they sound like in person.

mobeious
11-24-2009, 06:49 PM
il post a vid today so you guys can hear it. i tried posting one up a few days ago but stupid youtube removed my audio.
il post a vid tonight! thanks for the help !

ya i wouldnt waste ur time with a vid... i can work u up a design that will suite ur needs if u would like just hit the contact link in my signature

robertoyoung08
11-25-2009, 01:53 AM
lol
yeah i know i didnt have to waste my time with the vid. took it anyways, it wasnt a bother. been wanting to upload some for my build log thread anyways.

well this is a little ghetto video. i hate when people take vids and they dont even make them good. well i ended up making it ******. didnt have time to do a good one. only about 30 secs.

http://i18.photobucket.com/albums/b118/Importracer280/th_MVI_0001.jpg (http://s18.photobucket.com/albums/b118/Importracer280/?action=view&current=MVI_0001.flv)

so 3.2 cubes at "35 hz" still not sure if my aero math was done right. i cant explain how hard of a time i went through to get the aero sizes and even then i had a lot of people telling me they were wrong and everyone was giving me diff numbers. its been a couple of days of playing the mx and yeah i am pretty disappointed, so i definitely do want to fix this.



before anyone gives me **** about the vid. yes, i know the sub is barely even flexing. volume was not loud, amp gain is 1/4 of the way (zero bass bost) and HU subwoofer level is less than 0, so that explains the low flex. also, as i mentioned, im barely breaking it in, so i rather not try anything crazy and blow this ****er. not yet. lol . just took the vid as a hope for at least a little bit of encouragement for you guys to help

thanks!

robertoyoung08
11-25-2009, 02:05 AM
ya i wouldnt waste ur time with a vid... i can work u up a design that will suite ur needs if u would like just hit the contact link in my signature

thanks mobeious. how much do you charge for box designs?
mine is pretty simple and i think i just need to find out if my aeros are correct, so it should be pretty easy (for someone who really knows anyways). and i already have the box so i dont know if you would need to go through a whole box design

thanks

Chrispy
11-25-2009, 02:19 PM
What kind of wood is that?

robertoyoung08
11-25-2009, 05:33 PM
3/4 mdf.


haha. no its not mdf. its plywood.

yeah yeah i know boxes should be made out of mdf.
but i told my dad to get some mdf (he does construction) and he brought back some plywood to try. its 3/4 thick, but not mdf.

seems to be fine. i was actually wondering if plywood would have an effect on the sound. i dont think it should other than how strong it is.

Ceebes
11-26-2009, 10:25 AM
I was actually wondering if plywood would have an effect on the sound.

Yes it does. something about resonance. or how ever you spell it. Other people will know more. sry I'm not much help...:(

JimJ
11-26-2009, 10:31 AM
The enclosure shouldn't be resonant, no matter what it's constructed of.

Chrispy
11-26-2009, 06:52 PM
And MDF is more acoustically dead than plywood.

PV Audio
11-28-2009, 03:16 PM
And MDF is more acoustically dead than plywood.Not true. MDF is more acoustically dead than the plywoods you buy at Lowes. Good 13 ply plywood is about as good as it gets.

robertoyoung08
11-29-2009, 12:22 AM
okay. so is one of my problems the plywood im using or no?

i havnt been on in a few days and i havnt been working on my system these past few days.

hopefully i can start on fixing the box tomorrow.

i was listening to it yesterday, and i noticed that sometimes when i crank it too loud, when the bass hits my full range washes out, like it distorts when the hard notes hits. is this because of the subwoofer or is it possibly cliping from the full range amp? i was thinking the subwoofer was taking too much power so it distorts at those levels, but then i was thinking, maybe clipping?

robertoyoung08
12-03-2009, 12:25 PM
come on. any more help on this?!
want to figure this out so bad! at least some helpwith aeros please?!

CRXBMPN
12-03-2009, 12:28 PM
the RE MX is such a waste of a sub in higher notes, and very inefficient. go with a large azz sealed or ported box. or get a better sub, i had four and didnt like them.

loud-n-low
12-03-2009, 12:34 PM
sealed.

patotay
12-03-2009, 01:40 PM
possible clipping..

or the port area

DBfan187
12-03-2009, 01:42 PM
Ib

robertoyoung08
12-03-2009, 04:29 PM
why didnt you like your mx?

well i saw it and really wanted it, so i guess until i try it out in a good box i wont be able to say for sure if i like it or not.
so far i do say it ***** for higher notes, but cant tell yet.

robertoyoung08
12-03-2009, 04:52 PM
and ive heard mx's in sealed are horrible

SicAudio
12-03-2009, 04:59 PM
Not true. MDF is more acoustically dead than the plywoods you buy at Lowes. Good 13 ply plywood is about as good as it gets.

^^^^^^^^^

so very true. some of the best boxes are made from birch plywood.
ill take 3/4" birch over 1" mdf all day long.

as far as tuning even greg at RE will tell you 33 HZ and they just dont play loud at higher than 60 ish.