So as many of you probably know i managed to score a great deal on the 540a a few days ago, including a 15 day try at home period.
Now i am completely satisfied with the performance of this amp, but i could return it and get the 640a from the same place for only 30€ more.
Now my question is, is there a difference in sound quality in the two to justify the trip and teh extra money?
aside from the power rating, are there any other diffs between these two?
Cheers