I've been using a Proceed Amp 2 to drive my LS50s with an Oppo 95 as source. I substituted a used Parasound A23 to check it out in this simple setup. The LS50s sound very good with either amp, but I think I prefer the sound with the Amp 2, a bit more presence and a bit less warmth. I think a used Amp 2 is just a few hundred dollars more than an A23, but they are older amps and don't have the neat audio trigger of the A23, a nice feature given neither an Oppo 95 nor 105 supplies a 12 v trigger for the Amp 2.
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