Phono-pre: subsonic filter on or off ?

Sorry Bob, but I think you're missing the point as you're getting too hung up on semantics rather than the design purpose. The point is that subsonic filters are designed to suppress low frequencies that are not audible to the human ear, and are not concerned with the speed of the sound waves, despite the arguably semantically incorrect nomenclature. So if you want to be the Thesaurus police (and as I explained in my previous post, an argument can be made you're wrong about that too), go ahead, but the Marakenetz's point is correct.
Btw, KAB does use the word "subsonic" when describing the filter. I took a quick look and saw the reference at least thrice on their website.

http://www.kabusa.com/rf1.htm

And who the hell is Will Rogers?

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.

Bob,
You're probably right. I did notice, however, that the use of the term "subsonic" is actually quite pervasive in audio nomenclature when discussing rumble-related issues (I did a search on the internet for "subsonic filter"). It often seems to be used interchangeably with "infrasonic," which I agree is a more correct term. I wonder if the use originated together with the term "sub"/"subwoofer" and then caught on.

2 beats per minute is the rough estimate of the heart beat.
4 beats per minute is 2x the heart beat that is blood circulating in/out...
anything that is the closest magnitude of that is dangerous if reaches certain SPL magnitude levels and considered to be a weapon.
4hz, 6hz, 8... 12 could resonance with heartbeat.
INSANE???
ANYONE WANTS TO AUDITION THIS MUSIC AND EXPERIENCE???
RAISE YOUR INSANE HAND...