AVS Forum Special Member
Join Date: Jul 2001
Location: Akland, Norway - on the frozen tundra
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I have an installation in my cabin that just has to be done by the end of next week. I was planning to use a stock subwoofer, but because of a few changes by the architect (my wife, of course...) I suddenly had a lot less room for the thing. it's going to be rather tricky to get this to sound good (not talking about hifi good, more like "rock'n'roll cool and fun" good) because:
I have to use ceiling mounted speakers for midrange and treble. I have some I want to use, and they work nicely. But the room is only one narrow hallway away from where my daughter sleep, and I really don't want to wake her up when she's sleeping or have to play very low volume to avoid waking her up (what's the fun in low volume?). So I have spent a week insulating the room where the installation is going to be, with double fiber gypsum towards the hall, 70 mm of Rockwool in the wall and a 40 dB door. The result is nothing but stunning. If I could have used regular speakers I'd have no problems. But there is no place to put them that will even be close to usable. The only, and I mean only, solution is to have the directonal part of the sound (from the treble and as far down as I can) in the ceiling. Why not bass? Because that will be transfered by the ceiling beams straight to my daughter's room! And in addition to that there is only regular, 150 mm mineral wool insulation in the ceiling. But I figure that when the sound that is directed downwards has to go up through 150 mm mineral wool up to the attic and then having to go through another 150 mm and the ceiling boards on the other room to get down again that should stop more than enough of any sound that isn't a vibration in the materials. I have tested with regular speakers and like I said the results of the sound proofing is impressive. So I will use a AODA SC-202 active crossover to tune the ceiling speakers until they don't transfer vibrations.
And this lengthy explanation brings me to the actual question: I need a sub in one corner to do everything below what I can send to the ceiling speakers. My guess is that it will be anything below 400 Hz, or 250 if I'm very lucky. I have 25 centimeters max width, and I can probably go to around 50 cm height and 40 cm depth. I have looked at the tapped horn system, and if that can do full bass frequencies that will probably be nice. But I have read up on them and it seems like I can't really count on them above 150 Hz or so. So my question is this: Would it work to build a narrow and tall (25x50x40) subwoofer box with two drivers mounted in the side? I'm talking about a 10" woofer at the bottom and an 8" above this, with a partition wall between the two parts of the box. I would use MDF for the actual box, but then use the same type of wall plating that the room has on the outside of that for looks (wife/architect again...). So what would look like one box (probably with a flower pot or something on top, insulated with sorbothane) would actually be two separate subwoofer cabinets. I built something similar a few years back for a Chevy Suburban I had then, only with two 12" JL Audio subs in one very broad, wide and thin box that was parted inside.It was so thin that the drivers had maybe 10-15 mm from the bottom of the magnet to the bottom of the box, but it still sounded incredible, much better than the ported box that the previous owner had used. Only this time it will be two different sizes of subs and different frequencies. I have an Alpine SWS-1043D laying around, and I could use that for the 10". It's a very low profile, but extremely good and powerful driver. I can probably get a 8" Alpine or similar quality sub in the area.
So please tell me if I'm barking up a totally wrong tree here, or if I'm actually on to something!
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