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528hz
05-30-2008, 12:01 PM
O.k, I need a 4.17 cu. ft. ( this includes my taking into account displacement) AERO ported box for these 3 RE SE 10".

My max dimensions are 36x16x16= 5.33 cu. ft.

I would like it aero ported tuned @ 26 hz, and I think I may have to put the ports on the side of the box.

Can anyone help me?

528hz
05-30-2008, 12:02 PM
Here's what I've got right now:



http://i87.photobucket.com/albums/k125/turbocivic_01/DSCN1067.jpg

SPY
05-30-2008, 01:14 PM
I can do it if your still looking for someone.

PM me if you want me to do it, I don't want to wate my time if someone else is already working on it.

Also how many and what size Aeros?

Just an fyi I had 2 10" RE SE's in 2.5 ft^3 with one 4" aero and i sounded pretty good.

528hz
05-30-2008, 01:19 PM
FINALLY!!

God damm I was wondering if no one was on or did I **** everyone off for some reason.

I've never worked with aeros and have no idea how/where to start. All I know is my max dimensions I can build the box and what I want it tuned at (26 hz) can you help me out with some suggestions.

Your the man for the job!

SPY
05-30-2008, 01:21 PM
OK, Give me a few min.

groundpound4200
05-30-2008, 01:23 PM
I dont see any 20.1s in there :confused:

SPY
05-30-2008, 01:23 PM
You want 4.17 after displacement or that's what you think you need total for the box?

528hz
05-30-2008, 01:28 PM
I dont see any 20.1s in there :confused:


Behind the box good sir;)

528hz
05-30-2008, 01:29 PM
You want 4.17 after displacement or that's what you think you need total for the box?

I need 4.17 total. I need the air space to be 3.75, my total displacement is .42 for all 3 subs.

SPY
05-30-2008, 01:32 PM
OK, you need 4.295 total volume because you forgot to add for port displacement,

Also you math above is wrong. I'm assuming your 36x16x16 is outside dimensions in which case you have 4.197 ft^3 total to work with (which isn't enough room).

SPY
05-30-2008, 01:42 PM
You need another 3/8" of height or depth to get the proper airspace.

528hz
05-30-2008, 01:42 PM
Thanks for looking out. Did not consider the port.

Damm you're right, I'm glad I'm not working with money today the way my math is going.

Eh, 4.197 will be fine. That's only 0.032 cu. ft. less per sub which shouldn't be too big of a deal.

maldecido33
05-30-2008, 01:43 PM
Why 26Hz? Awfully low for those subs as well as the environment in a vehicle.

maldecido33
05-30-2008, 01:44 PM
If you tune higher (which you should), you'll gain more airspace :fyi:

SPY
05-30-2008, 01:48 PM
^^^he's right^^^

I tuned mine to 32hz


If you did that you would only be off by .0167 ft^ per sub

528hz
05-30-2008, 01:57 PM
Let's tune to 28hz. No I'm not going to do 32hz. I want it to respond like a sealed box and have an almost flat reponse.

SPY
05-30-2008, 02:01 PM
I can do it how ever you want, if you want to keep it at 26 that's fine with me, just posting up your options.

maldecido33
05-30-2008, 02:10 PM
Let's tune to 28hz. No I'm not going to do 32hz. I want it to respond like a sealed box and have an almost flat reponse.

Then why not seal it?

There are many more factors in getting a flat response than just low tuning.

Just get a properly designed sealed box (by proper I mean a box with a Qtc of .707; perfectly flat response). Also, treat the sealed box with some sort various acoustic treatments.

528hz
05-30-2008, 02:18 PM
The box I have them in now is sealed and is optimal. It responds great, but I want more output. When I had my XXX 12" in a 2.5 cu. tuned @ 32hz it was nice and loud, but there was still some slight group delay that would be hard for most to hear. I could hear it though especially with some D n B.


Spy: let's do the 28hz and may do one aero on each side of the box.

SPY
05-30-2008, 02:22 PM
Well here you go.

If you tune to 28hz you can have the ports on the front, if you go any lower with the tuning you will have to move them to the sides.

http://memimage.cardomain.com/member_images/1/web/3049000-3049999/3049092_140_full.jpg

Let me now if this is what you want and I will PM you with the details.

528hz
05-30-2008, 02:24 PM
O.k. Looks good.

PM me the details.

kovemaster559
05-30-2008, 03:02 PM
Not bad

SPY
05-30-2008, 03:36 PM
Not bad

it's a simple design, but I believe that's what he was looking for.

BrianChia
05-30-2008, 04:11 PM
The box I have them in now is sealed and is optimal. It responds great, but I want more output. When I had my XXX 12" in a 2.5 cu. tuned @ 32hz it was nice and loud, but there was still some slight group delay that would be hard for most to hear. I could hear it though especially with some D n B.


Spy: let's do the 28hz and may do one aero on each side of the box.

I don't think you accounted for in vehicle gain when modeling your flat response. I modeled 3 boxes with 3 RE SE10s approximating for cabin-gain. Yellow is 3.75cf @ 28hz ported, red is 2.0cf sealed, and orange is a 4th order bandpass design.

http://img294.imageshack.us/img294/776/bb6mo0.png

528hz
05-30-2008, 04:48 PM
My car peaks at 45 hz.....what does that tell me/you?

BrianChia
05-30-2008, 04:57 PM
It will still exhibit a gain of approximately 12db/octave beginning from about 50-80hz down, depending on the size of your vehicle. The larger the vehicle the lower the frequency when the transfer function begins to take effect. That means that a ported box that models perfectly flat in an anechoic environment will actually produce a peak at the tuning frequency (as shown above) when used in a car.

A .707 Q sealed box will typically produce a flat response in vehicle a because it tapers off at 12db/octave, matching and compensating for the 12/db boost produced by the transfer function.

528hz
05-30-2008, 05:14 PM
Well Brain, what do you think? I've been nevous about building a bandpass and I don't even think I would have the room:

36x16x16.5??

BrianChia
05-30-2008, 05:35 PM
The orange line shows a bandpass box with 2cf in the rear chamber, 1.5 in the front chamber, tuned to 55hz. It should fit in your dimensions. If possible you can increase the rear chamber to 2.5cf and gain a little more bottom end. You won't gain as much output as the ported box but if your goal is a flat response then 4th order will probably get you the closest.