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RE: Good Experience with FMODs

Can you point me to the measurements on the ET site showing this? (I can't find them.)
I see a graph on this page, but it looks like a dip at 1khz, not a peak.
http://www.eminent-tech.com/LFT8specs.html

A 2nd-order (FMOD) filter introduces a group-delay into the woofer path of about 600usec. (Equivalent to about 8 inches.) Any square-wave performance you might have had in that region is degraded when you do that.
Also, the reverse polarity preference noted by REG provides a much better phase match to the midrange driver in the crossover region, but it would degrade the advertised square wave performance too. I'm not sure why that's considered a matter of preference. It's an objective change to the system design.

Anyways, your solution only works for those that are bi-amping.
Fashioning a simple trap into the stock woofer filter could easily address a cone resonance issue. Why has Bruce not implemented that?

Always there are trade-offs with speakers. :)

Dave.


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