Originally Posted by dbphd
Not sure I agree. I used Parasound A23 and A 21 amps to drive the LS50s; A21 sounds better. I used a Proceed Amp 2; sounds about as good as the A21. I'm using an Ayre VS-5 Twenty that sounds the best of all by a substantial margin. The LS50s seem revealing of the amplification that drives them. Not sure if that makes them demanding or disclosing.
Well subjective experience is certainly valid, but unless you are listening at ear splitting volumes or those amps are badly designed and/or broken, the output will be objectively the same within the limits of human observation.
Look at the Ayre VX5 Twenty vs the Parasound A23
Up to 100w the oscilloscope says the Parasound is the better amp, with 1/10th the distortion of the Ayre.
Additionally output s/n ratio of the Parasound is better than the Ayre as well:
Output noise (stereo mode), 8-ohm load, unbalanced inputs terminated with 1k ohms, Lch/Rch
- Wideband: 0.220mV/0.197mV, -82.2dBW/-83.1dBW
- A weighted: 0.069mV/0.060mV, -92.3dBW/-93.5dBW
Output noise, 8-ohm load, unbalanced inputs, termination 1k ohm, Lch/Rch
- Wideband: 0.58mV/0.58mV, -73.8 dBW/-73.8dBW
- A weighted: 0.085mV/0.084mV, -90.4dBW/-90.5dBW
I'd bet if you level matched the two amps and did an ABX test at reasonable listening volumes you would not be able to tell the difference between them reliably, or even a used Sony AVR from 2009.
Regardless of the above, subjective enjoyment is most important since you as the owner are the one that has to live with your setup. So don't take the above the wrong way