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RE: been there

Posted by triamp on May 22, 2011 at 03:36:57:
Well, how many dB down was the response in the lower mids than at 1 kHz? If you can hear frequency response differences, you can measure them. Some things that are audible are hard / not yet possible to measure, but frequency response is not one of these. There is no magic, no juju here. If the signal coming out of one setup has lower levels in some part of the spectrum than the signal coming out of another setup, you can measure this. You can use actual music, generated tones or noise to make the measurement, whichever you like. Measurements to fractions of a dB are easily carried out, which far exceeds the ear's ability to discriminate in terms of loudness differences.

My guess is that if this is not some impedance related issue, or a preamp that is not flat across the audio spectrum, then it is placebo effect and would vanish in blind testing. The speakers don't know that the sound is coming through an active preamp - but the listener DOES.