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Old 19th May 2006, 05:18 PM   #11
Kensai is offline Kensai  United States
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Going OB would fix baffle-step. If you went passive with the xover (I know, contrary to my earlier advice; this is just a for instance), the big inductors you'd need would add resistance that would raise the woofers' Qts. You could just engineer the low pass to where it gives you enough resistance to get a Qts around .7 and it should be really good in OB. You'd have to cross a bit higher, probably as I doubt the you'll get a smaller FR to be any good below 150Hz without EQ (unless, of course, you find one speced well for OB, which there aren't many).

I personally use Kenwood KFC-6469s as OB FRs in my office. Without EQ they're reasonable to about 60-65Hz before falling off a cliff. EQing the crap out of them (which I don't really have the amp for; I can pretty easily clip my little T-Amp with some hard driving music at higher levels), I can get pretty flat to 35-40Hz and at least audible at 20Hz (though you won't hear it if anything other than a 20Hz tone is playing ).

There are a few theoretical ways around this, I guess. You have T/S parameters for your woofers? That might help.

Kensai
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Old 20th May 2006, 08:21 AM   #12
swin1 is offline swin1  Australia
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Below is a pic of the woofers I have, there's 4 of them. Jaycar response carbon fibre, quoted T/S:

Sens - 89db
Re - 3.79ohm
fs - 43Hz
Qts - 0.449
Vas - 15.1l

Like I said, smooth detailed bass (Ported 22l, 38Hz) but lacking in the mids. I have a 24db/octave electronic crossover, the the full range with be actively filtered. So what size drivers would work with 1 or 2 of these?
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File Type: jpg midbass.jpg (51.1 KB, 182 views)
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Old 20th May 2006, 12:48 PM   #13
tinitus is offline tinitus  Europe
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With that low Re you will have couple in series if you use two pr side - dont know about that

But I would definately recommend one of the previously mentioned 5"

Fostex Fx120 with assistance of the sweet little Peerless Vline(formerly Vifa)... XT19(ringradiator) above 10khz, quite sure it would work very nicely, and you wouldnt need any attenuation


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