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In Reply to: RE: It's not that 2Hz is ever audible... posted by Lew on May 17, 2016 at 07:49:03
What I wanted to know was if people can really hear it. One argument againt going so low is the excursion from a greater amount of low frequencies that cannot be heard. Some pretty smart folks like the 2hz number.
Follow Ups:
I thought I answered that question; you cannot hear it, partly because it is not there in any feasible audio system, and partly because you could not hear it if it WERE there, in which case you would FEEL it but not really hear it. OK?
If anyone told you that he or she can hear 2 Hz, either he was pulling your leg or you misunderstood the comment. Possibly the person could have meant that he or she can hear the effect (at 20Hz, for example) of having the -3db point at 2 Hz vs, for example, 4 Hz.
You are misunderstanding the question. It's the consequences of phase shift I'm talking about, phase shift that can be at 10 times the -3db point. Of course you can't hear 2hz.
I did offer that as an alternative interpretation of your question. And my additional comment is that if someone says they can hear something (anything), there is really no way to argue the point so long as we are talking about frequencies within the range of human hearing. So, if you're worried about phase shift at 20Hz, then make your -3db point as low as possible. That's the best anyone can do. However, the possible downside of that has to do with phono, mostly. Very low frequencies are spuriously generated in creating LPs (from the cutter head, or so I am told) and in playing them back (warps, turntable rumble, etc). If these spurious signals are sent to the line stage and downstream, they can sap amplifier power uselessly or muddy the speaker sound, or both.
I recently installed an output coupling capacitor on my phono section that probably creates a 2 Hz, or even lower, -3db point. I used that particular capacitor because it sounds so good at mid and upper frequencies, and I don't have a similar type in lower value so as to effect a higher bass cut-off. The result is that I think I am hearing some extreme low frequency junk with phono that is polluting the sound a bit. I am still trying to decide how to deal with that without spending more bucks on smaller value but equally good sounding output coupling capacitors.
Lew, Your comment about having to do mostly with phono make a lot of sense. The dac came with a unnecessarily high output cap that and I was wondering why even go to 2 hz if it was risky in terms of woofer excursion. Good explanation. Thanks, Tweaker
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