Phono-pre: subsonic filter on or off ?

Marakanaetz, I read that article and find nothing nothing in it that proves your contention that low frequency sound causes the heart to burst from 'sympathetic' beating with the low frequency and therefore bursting. That some people are susceptible to low frequency sound and become nauseated is well known, however.

Also, note that the low frequency sound is referred to as INFRA sound and never is the term SUBsonic used to describe low frequency sound below normal hearing capability.

Respectfully, Bob P.

I use the sub filter on my Cambridge 640P because it works really well by blocking speaker pumping with no difference I can hear...tried an experiment: I put my cat in front of a speaker and switched the filter off to see if it would kill him...he survived...damn.

51 beats per minute! What?!?! You a marathoner, Bob? ;-)

Does this mean I'm rolling off some bass and perhaps not getting the full bass slam I should ?

Maybe. However, you may also not be getting the full bass slam without using the filter. Many times there are sonic benefits to not feeding frequencies to an amp that it does not need to reproduce. In this case there is more of the power supply output available to reproducing the thwack of a kick drum rather than the rumble from the table. Only you and your ears can tell us which works better for your speakers.

I use both active and passive filtering when I find it beneficial. I have two, 18" drivers in my bass horns that handle from ~100Hz and down. I do not use a rumble filter with my horns because they roll off very quickly below 25Hz or so. I also have a pair of Aerial 10t's that get down about the same. These speakers are ported in order to get down there. As you can imagine they pump a bit when I move them into the system. If these were my main speakers I would most likely use such a filter, but it would be of a much higher quality than the KAB filter mentioned on this thread. Nothing wrong with the KAB, but it can be bettered.

No Dan_ed, I am not a marathoner, but, ironically, my breathing training for playing brass instruments (french horn and trumpet) has helped me in lowering my heart beat rate.

Salut, Bob P.