Is the moscode 300 the Best $600 used amp?

Rrog, I'll tell you how. Because the OP's question was about sound not specs. And while an amp's sound is affected by the load, every amp, if operated within it's comfort zone, has an intrinsic character. Now, what can you tell us about these amps' sound? Am I the only one who has owned "wimpy" 25W amps that sound infinitely better than certain 300W monsters?

Frogman, The OP's question is about the Moscode 300. However, your response was about the Moscode 600 compared to B&K ST140. There is no comparison sonically or otherwise. Please try to stay on the subject here.

Rrgo, while I really have no interest in a pissing contest, it must be pointed out (since you apparently don't know the sound of these amps), that both BK amps, as well as both Moscodes, share a very strong family resemblance; so my comments are very applicable. I will endeavor to, in the future, be more clear for the sake of those less informed.My bad. BTW, I and many others feel that the 300 is the better sounding of the two Moscodes.

One 300 is better than 4 Moscodes, unless they are the original orignals. IMO

Frogman, Actually I do know the sound of these amps since I have owned them all. Regarding the the Moscode 300 sounding better than the 600, it is common within a design for the lowered powered amp to sound better, "less is more".