Speaker Asylum

Not quite ...

124.181.75.197

In Reply to: RE: subwoofer crossover perhaps i am misunderstanding.... posted by Jim in Blacksburg on May 07, 2008 at 05:42:36

The freq quoted - eg. 12dB/octave slope at frequ "X" - is not the *start* of the roll-off (ie. 0dB down) ... it's the so-called "knee frequency", where the signal has already been attenuated 3dB (for most Xovers) or 6dB for L-R Xovers.

So in your 60hz LP example (with a 12dB slope), if it was a 12dB/octave L-R filter then @ 60hz the signal is already 6dB down ... at 120hz it is 18dB down ... at 240hz it is 30dB down.

If it was a 12dB/octave Butterworth then @ 60hz the signal is 3dB down ... at 120hz it is 15dB down ... at 240hz it is 27dB down.

Regards,

Andy

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RE: Not quite ... - Jim in Blacksburg 10:14:19 05/09/08 (0)

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