Phono-pre: subsonic filter on or off ?

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.

03-26-11: Marakanetz
Check that out...

And you think your puny system is capable of this? Even if this is true....which sounds like the crap that you are espousing (2. To give one's loyalty or support to (a cause, for example); adopt.) Why didnt millions die in the Japan earthquake?

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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.