Audible hiss from listening area 10 feet from main speakers (still did not read above 50db on the SPL meter but it is definitely more noticeable than the Yamaha was). The hiss was independent of source as well as volume level.
My hiss is like yours: independent of volume and source. 10 ft is pretty far away (mine is 2-4 ft). Can you hear it at your listening position?
Likewise
my hiss doesn't register above 50 dB on an SPL meter, even with the SPL meter shoved up against the speaker. But obviously, I can still hear it. Two conclusions:
1) People can hear sounds of less than 50 dB. (Duh!)
2) SPL measurements of hiss don't really mean anything unless they are *above* 50 dB, and hence, that is pretty bad hiss!
3) "Reference" level is 75 or 85 dB or something? So even a 50 dB measurement only gets you 25-35 dB of dynamic range, signal-to-noise. What is CD's theoretical limit... 96 dB or something?
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