Stringreen...You are correct about the speaker efficiency not being a factor IF you make the test with the volume turned up to equal levels with the two kinds of speakers. I was wrong, (but was led astray by Atmasphere).
But you are wrong to think that a tiny inaudible 60 Hz signal could adversely affect the music signal. IAP.
But you are wrong to think that a tiny inaudible 60 Hz signal could adversely affect the music signal. IAP.