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djn 14th November 2012 10:34 AM

Do I really need a stiff enclosure???
Hi All, I've been looking at all my option for two sub drivers I have. One option was to use two cabs I have already and just convert them. The other option is to use a small storage space that is built into the wall already. It measures approx. 4' x 6' x 3' and the opening is 24" x 24". I was thinking of framing in a very stiff baffle board into the opening and mounting the two subs there.

I already have two subs in the room so this one would be for smoothing.

Here is my question. The enclosure walls are 2x4 and sheet-rock construction but most of it is not in the room so does it matter that it is flimsy by sub cab standards?

m R g S r 14th November 2012 12:42 PM

That's similar to an infinite baffle setup. It could work just set a high pass and go easy on the volume to avoid bottoming the drivers.

turbodawg 14th November 2012 01:12 PM

Well, that's 72 cubes, so unless it's some really odd drivers, they should act like a IB, aperiodic, or very low Q setup. Sheetrock is pretty stiff and damp, just not very strong, should be ok.

tb46 14th November 2012 01:21 PM

Hi djn,

Drivers have been mounted directly into doors (solid core) with foam weatherstripping at the door jamb, leaving the closet usable for storage.


Cal Weldon 14th November 2012 01:26 PM

Consider lining the space with plywood and Green Glue (or equivalent)

jrenkin 14th November 2012 02:32 PM

Don't forget about who will hear the thumping from the other side...

5th element 14th November 2012 03:52 PM

If this is only for smoothing then technically two independent subs, in different locations would give you better results. The subs only need to extend as low as the room has room modes too, so absolute extension isn't required. If you are mainly doing this to get more 20Hz output though, and smoothing is just a nice benefit, then by all means go with the monster in the wall.

Perhaps the wall sub would end up being the main sub, with your other two being used as fillers.

djn 14th November 2012 08:55 PM

Thanks all. I have two very good subs up in the front corners behind the speakers. I just happen to have these two sub drivers, an amp, 30 foot ICs and a cavity in the wall. I don't do HT and I don't have much pipe organ so going down really really low is not an issue. I just like to have good solid bass down to 30hz or so and want to be able to sit anywhere in the room and have the same output.

SO why do people brace the crap out of cabs???? is it because they are in the room and will cause cancellation if they can resonate?

duanebrow 15th November 2012 02:16 AM

Because people don't normally build 77cf boxes. Smaller enclosures have more stress/pressure.

m R g S r 15th November 2012 02:46 AM

^? The larger, unbraced panels will flex more than a shorter panel

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