Phono-pre: subsonic filter on or off ?

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.

Actually, subsonic means 'under the speed of sound'. The proper term is Infrasonic. We don't say sub-red for infra red do we?

Also, Carver produced an infrasonic filter that automatically adjusted its cutoff properties to the low frequency content of the recording and the turntable's inherent rumble or lack of.
Salut, Bob P.

Marakanetz, Infra and Sub are NOT synonymous. neither are Ultra and Super.

Ever heard of super violet? SUB-Sonic has always been used for the speed of an object being lower than the speed of sound and never for UNDER-AUDIABLE, whatever that is. If you meant audio or audible, then that is not synonymous with sonic either. Sonic has to do with sound, not audibility.

Infra and ultra have always been associated with frequency, low and high, of vibration, sound and light, among others.

Perhaps this is a second language thing.

respectfully, Bob p.

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.

Actusreus, you are missing my point. It is Marakanetz who is saying to use the term Subsonic (or at least that it is synonymous to Infrasonic) for the Rumble filter. I am saying that the proper term is Infrasonic. Note that KAB avoids either term in all its literature.

You know what Will Rogers said about 'common sense', don't you? Or was that Mark Twain?
salut, Bob P.

Actusreus, I guess its the engineer in me that prefers to use the correct terms to express ideas or concepts, notwithstanding KAB's incorrect use of the term SubSonic. KAB is probably using that term because they know that the 'layman' would not understand their descriptions if they did use the correct term - infrasonic.

With respect, Bob P.

Marakanetz, and the normal heartbeat is closer to 1 beat per second ( mine is about 51 beats per minute, when I don't get upset over utter nonesense such as this).
Although the literature does show that there are health issues associated with continuous exposure to ultra low frequency vibrations, including sound, there is nothing that indicates that there is any immediate effect on the heart. It can make one nauseous, however. Believe me, I have taken many vibration readings on industrial machinery where I was surrounded by loud low frequency vibrations and sound, it wasn't pleasant, but I never suffered any heart problems.
Salut, Bob p.