Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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It's not that 2Hz is ever audible...

Posted by Lew (A) on May 17, 2016 at 07:49:03

In Reply to: coupling cap -3db point posted by Tweaker456 on May 16, 2016 at 15:24:04:

Nor can any system in any audiophile home reproduce 2Hz, which is a good thing, because it would make you sick. The issue is phase. The low pass filter effected by the coupling capacitor affects phase to some degree at frequencies 10X the -3db frequency. Thus, if your filter has a -3db point at 2Hz, the signal will achieve 0 phase shift at 20 Hz, a frequency at the low end of the audio spectrum. I think this is why most designers shoot for -3db at 2Hz. In a phono circuit, some would say that you want your -3db point to be higher in frequency so as to filter out turntable rumble and other extreme low frequency energy such as from LP warps. Furthermore, whether one can really hear phase shift is controversial.

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