Woofers Gone Wild

I understand the sentiment of the purist approach to this problem, but I wonder how many of the purists actually used the filter and can offer meaningful advice. Saying it filters ergo it wrongs the signal is, in my opinion, a simplistic theoretical approach that does little to shed any light on its actual real life effect. I've been using the filter for a few months now and don't look back. I have no doubt that the woofer fluttering caused more deterioration to the sound that removing frequencies from the signal that can't even be heard. And warps often have little to do with the fluttering; the worse woofer pumping I noticed happened with a perfectly flat 200 gr record. And yes, my cartridge/tonearm matching is spot on.

Actusreus, I'll put it to you this way- the phono preamp I use is good to 2Hz and the amp is good to 1 Hz. I have 2 15" woofers in each channel, and they go to 20Hz. They really don't move much unless there is a bass drum whack or the like. The trick was simply to get the relationship right between the arm and the cartridge.

If you install a rumble filter, you add phase shift components that rob the signal of impact, as a 20Hz cutoff will have audible artifacts up to 200Hz- lower midrange! That's why keeping filters out is so important if you can do it.

Ralph, just curious: are your speakers a sealed design or are they ported?

Ported.

Hi Ralph, You said you have two 15" woofers per side and that they go to 20 hz, but is not subsonic noise less than 20hz? If your speakers only go to 20 hz and fall off after that would I not be correct that you dont need a filter since there is nothing to filter?

Being a manufacturer I am sure you have the ability to do an in room freq response. I am sure that is the way you know if you speakers are responding down to 20hz. What system did you use for measuring that room response?

Also you said that a 20 hz filter would affect up as high as 200hz. Why would that be so when the filter is filtering from 20 hz down not 20 hz and up?

Bob