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How to control long decay of B&W woofers ?

I have B&W Matrix 800 speakers (3-way system) with two 12" woofers per side. Currently the speakers are actively bi-amped between the woofers and the midrange modules using active crossover. A pair of KRELL FPB 350MC are directly connected to the woofers without the passive filters. The bass output is extremely good, deep and very tight. But some times I notice that on some drum beats the woofers don't stop as it should be, instead the woofers continue to make sound till the next drum beat. The long decay time of the woofers (some times) makes a kind of continuous background sound from the woofers and the sound becomes muddy. On many other recordings, the drum beats stop and start very accurately and the sound is very clean and crispy.

I am wondering what is the reason of this long woofer decay time (with some recordings) and how can I achieve a clean sound from the woofers ? I have tried the amps with damping factor upto 10,000, and the result is the same. Any suggestions from experienced inmates ?
Best regards,
Sunny
topmostaudio

Showing 2 responses by drrdiamond

drrdiamond
671 posts
 
My set up is the same as yours, I think. I do use the Krell KBX that was set up by Krell especially for the 800's and includes the bass alignment filter. Unfortunately, they no longer make the unit and I don't think they will make the board (but you can ask them, if you find a used unit).

I have had no such problem.

Fell free to contact me directly if you have any further questions.

Richard
RxDentist@aol.com
drrdiamond
671 posts
 
2nd thought:

Did you change the polarity of the woofers when you removed the low pass filters? You should have.

Richard
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