In wall sub back box question

[tcaster]

I'll have more space in my wall than normally required for the sub driver.
Should I or can I increase the depth width of the sealed back box or is it best to stick to 16" on center studs sides and 4 1/2" depth sealed back box box dimensions.
Using subs as bass augmenters for music ( jazz classical mostly) not home theater.
Only specs I have are:
8 Inch Subwoofer
Authentic Kevlar Cone with Extended Throw Drive Assembly
Power Handling Capabilities:
125 Watts RMS to 250 Watts
Frequency Response: 30Hz – 200Hz + 3 dB
Rubber Surround
Efficiency / Sensitivity: 98dB @ 1 watt 1 meter
Impedance: 8 Ohm
Mounting Depth: 4.25 Inches
No back box specs/instructions available from dealer btw.Thanks for any advice.

[tcaster]

I know it's guessing and I've contacted the dealer to try to get better specs etc. That being said is there an acceptable range (I was thinking around .75 cu.ft) for sealed enclosure volume for an 8" driver?

[tcaster]

I know this is the diyaudio forum but no responses?
I now have the TS specs but can't being a novice really tell if a sealed back box or which size etc. will help with these drivers. It all began here:

I bought a pair of mixed reviewed but affordable Acoustic Audio designed 8" in wall sub drivers.
I was wanting to try a pair of small subs to augment the bass for two channel listening with my Klipsch Heresy Industrials which are bass shy. I just want a little medium to low volume only bass fill in. I would like tighter bass and to hear the notes.
I have an Adcom Gfa1 amp and a Heathkit 2 way crossover for the lows. I am space challenged.I have already tried this with a bulky car twin 8" band pass subwoofer cab while it worked okay, that cab is designed for boom and is not as clear as I'd like.
There is quite a bit of soffit space (2 sides about 4cf per divided side)about 10"s under the drawers of my funky but solid semi open backed mdf stereo cabinet/shelf so I thought maybe I could mount the two 8" in wall subs in there, one on each side of the solid to the floor divide.

I realize that it might not be possible to improve the performance much beyond the specs these speakers were designed to do being in wall types etc. My questions are should I:
1. toss em?
2. try them as is maybe add some polly fill damping around them in the space?
3. try to seal any air gaps in the back of the cab, maybe pack the cavities and gaps with poly fill as best I can?
4. build ligit sealed braced mdf back boxes etc. and if so any enclosure volume advice for in wall subs?
5.start over with speakers designed for sealed back boxes (I had to ask)?
6.before I cut holes in my cab what kind of sound should I expect from in wall subs?
I'd like to salvage the project if possible but don't want to waste anymore time either.
Thanks I hope!

[killa12222]

You can use WinIsd to model boxes. Just punch in your TS specs and see what fr you get

[tcaster]

I don't think WinIsd runs on a Mac that doesn't use parallel Windows does it?
I tried a couple other enclosure calculators with my TS parameters at different Vb and got Fs that were higher than I'd expect to get so maybe these drivers just won't give me much lower bass anyway.I'm new to all this and while it's all fascinating it is boggling as well.I'm going to work on it some more.Thanks.