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RE: puzzled... ,consumer & pro Subs

Posted by Bold Eagle (A) on July 14, 2007 at 13:27:57

In Reply to: RE: puzzled... ,consumer & pro Subs posted by cornerklipsch on July 14, 2007 at 10:22:30:

Rob,

Back in 2001 I was looking for a sub to go with a pair of B&W 602's and tried 6 of them, finally settling on a B&W ASW-500. The others all had a bad case of low frequency rumble and too much output below 50 Hz.

The psychoacoustics of low frequencies are not what people expect (based on the hype). To get a sense of low frequency power and still have a sense of "speed" requires a maximum output up around 50-60 hz and a smooth, gradual rolloff below 50 Hz. You want a slower rolloff than 12 dB/octave. You can find this by experimenting with a 1/3 octave EQ and a spectrum analyzer. Evidence of this shows up by inference in the specs of some speakers and the test data on others. Basically, as the low frequency system resonance gets lower in frequency you want a lower Q which has the effect of rolling off the low end, and as the resonance moves up, the Q gets higher to create a bass peak that gives the sense of more low end.

Too much output down around 40 Hz gives a muddy quality to the bass which we perceive as "slow".

I try to tune my bass output by placement and tuning to get the right sound, so I don't have to use an EQ, but the curve shape is the important thing and it doesn't much matter how you get it.

Jerry

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