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XLR8R22
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Miscellaneous subwoofers

So I have a bunch of subs lying around, wondering if any of them are worth their salt, and ideas on what to do with them.

Polk GNX124 12"

2x Unknown brand, maybe Ultimate, says "Attitude" on the dust cap. 10", dual voice coils, I think 80 oz magnets.  Seem high quality.

Cheap "Dual" brand 10" car sub, pretty sure it's crap (?)

One of the Attitudes is in a custom built ported box built probably 15 years ago by a friend of the family who is an acoustic engineer.  Using it as general purpose music/home theatre.

The other is in a huge ported box combined with the Polk.  Box was built for a different 12" by the same guy, was my first sub, blew it out, put the polk in it, then was bored one day and stuck the other Attitude in it (before I knew anything about box building or tuning).  It's loud, I hook it up for big parties or to fight back annoying apartment nieghbors who play crappy bass too loud or too late (I always win :D ).

Also 2 generic MTM 8" subs (part number 55-1190), one I just finished building a sealed box for today.  Lower frequency response is lacking but the box went together very well, and I'd like to think I designed well.  Has very nice response around 60-140hz.

If anybody could give me some specs or links for the Attitudes, or stories of your own, that would be much appreciated.

Also any ideas on what to do with the rest?

jackfish
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If it is the Ultimate Attitude AU1050...

Attitude AU1050 10" Stamp Frame Woofer: 250 watts RMS/350 watts max; Impedance: 6 ohms per coil; Frequency response: 25-200 Hz; Magnet weight: 50 oz.; Fs: 29 Hz; SPL: 89 dB 1W/1m; Vas: 3.50 cu.ft.; Qms: 8.20; Qes: .45; Qts: .43; Xmax: 9.9mm; Net weight: 9 lbs.; Dimensions: A: 10-1/16", B: 9-1/8", C: 5-1/16", D: 5-1/4", E: 1-1/4"

If your application is music, I would rid myself of your existing subwoofer chattel and build a pair of Critical Q subwoofers. http://www.customanalogue.com/sub_index.htm

XLR8R22
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Ideally I would like two

Ideally I would like two subwoofer systems- one for audiophile grade listening and one for big loud thumping wall-shaking beat blasting explosion style bass.  That link looks like it takes care of the first one, any suggestions for the second one?  Could I put the two Attitudes and the Polk in a single box just to be loud?  Or is that crazy?  How would I go about calculating that?

jackfish
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The two Attitudes could be

put in a single ported enclosure. You would have to model the enclosure based on the driver parameters.  I wouldn't try to add the Polk driver to the mix. However, you would likely get better results by using two subwoofer enclosures, each with one driver, as you could then place them in the room accordingly to minimize peaks and nulls.

http://www.ajdesigner.com/speaker/bcv.php

http://www.bcae1.com/spboxad2.htm

1crazed Cat
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Dual subs

If it's at all possible, I would recommend using 2 subs in seperate enclosures upfront: the ult atts. You can then put a 3rd one behind your chair and turn the level on this 3rd one up just enough to feel it. I have an extra sub that I do this with. It adds to the realism.

XLR8R22
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For what it's worth

The Ultimate Attitude is the AU1070 model.  Are the specs any different?

jackfish
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Most likely

they are different.  Without published parameters you might have to measure them off the driver.

http://www.diysubwoofers.org/measure.htm

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