Custom In-wall Sub

[annunaki]

So a very good friend of mine wanted "bass in his space" but would not have any sort of enclosure on the floor. He is not a "bass head" by any means but wanted a sub for movies & such.

After checking out his unfinished room, we determined the location and measured out some dimensions. Seeing as though the maximum depth for the entire enclosure could not exceed 4-5/8", this was not going to be easy.

Driver selection was somewhat difficult mainly for the fact that the mounting depth was so little. I looked into some flat woofer designs, but these never modeled up well for a home application with a system capable of reaching the mid to low 20's(hz) at a decent output level.

Ultimately I decided on dual JL Audio 8W1v2's. They are a known entity in terms of being fairly linear and they have a very minimal mounting depth with no rear pole vent. This allows close proximity placement to the rear of the enclosure with no harsh effects.

The subs modeled up best in a 2.6ft^3 enclosure tuned to 24hz. This allows a-3db point anechoic of about 22hz. In room response will be a good bit lower. The other great thing with these drivers is that they only need about 300 watts rms between the both of them to reach full xmax as well as staying within the recommended power input.

To get the proper volume in a wall, this enclosure is (externally) 4-5/8" x 40" x 62" and will form part of the wall itself. It will also be isolated using a high density high resiliency rubber/foam.

Here are some pics from early in the process:

Main layout 40" x 62" footprint:


Vent piece prior to installation:


Round over on internal vent piece:


Bracing Layout internal:

[adwilk]

Thats freakin awesome, man. I cant wait to see it finished up and hear some results. Really nice work as usual.

[FNG212]

+1

I'm very interested to see how this turns out.

[pjoseph]

Looks great, this is going to be a great project.
Is that volume of 2.63ft^3 for both subs?

[annunaki]

Looks great, this is going to be a great project.
Is that volume of 2.63ft^3 for both subs?

That is correct. It is net volume after displacement.

[annunaki]

Here are some minor updates:

Here is a picture of the soon to be front panel of the enclosure. I have a 1/2" piece of MDF that will sit flush with the drywall that the woofers & grille will mount to. This also includes part of the vent opening.



Here is an internal view again, adding a few 1" pieces of mineral wool wrapped in grille cloth to help dampen some resonance within the enclosure. I have more yet to add though. One can also notice the area that will include the vent opening has been painted.

[annunaki]

More updates:

All Mineral Wool pieces installed:


Closer shot of dampening pieces:


Front of enclosure attached:


Side view of woofer with baffle attached to front panel of enclosure:

[annunaki]

These will be the final updates until I get over to his home to finish up. At that point, I will post some spec's etc.

The enclosure ended up being rather heavy. My estimate is around 120lbs+.

Here are a few pics of the last updated pictures I took.


Masked Baffles ready for Primer:


Masked Baffles with woofers in view:


Primed baffle with foam isolation strips to 'float' drywall on the front and prevent rattles:

[adk highlander]

Hey Annunaki,

Any updates on this. Very cool project and amazing skills you've got there. Please post more pics of the final install and thoughts when you can.

thanks.

[annunaki]

I am waiting on some pics from the installation. It looks wonderful in the wall now that it is finished.

It is a slowly progressing project. I was hoping to have pictures by now too.