Originally Posted by broke_ht_nut
Amps do have sonic signatures, largely because of their damping factors and also how they handle various loads across the frequency spectrum. It is physics something no on e can get away from.
Both posts are only accurate depending on the audibility of the specs that people love to quote. You are unlikely to hear the difference between an amp with a Damping Factor of 100, compared to one with a DF of 200. I offer the following since you mentioned that spec:
Furthermore, you are also unlikely to discern the difference between two systems playing at less than 0.1% distortion within their operating range, ditto for SN ratios above 75dB.
This said, comparing any of these amps by spec isn't going to tell you much. The psychological impact of a giant metal chassis that weighs 150 lbs will alter your opinion of the sound when it's sitting next to a small, 1U integrated amp (I guarantee many audiophiles will say silly things like "the bass is tighter from the larger amp") more than the electronics inside. Even physiological differences like the resonant frequency of your ear canal will change what you hear from your audiophile buddy.
Given that most modern amps fall within the critieria of producing output that does not influence the incoming signal (easily exceed the audible threshold of commonly published specs), I'd agree with the original poster that anything above a T-amp (highly lauded in the audio community) is probably inaudible on speakers with even a remotely friendly impedance curve.
So, I bet that the M2200 is fantastic, and I haven't even "heard" it...
I just wish companies could charge the same amount for such a simple device that is made in the USA.