To respond to something that Megasam stated, Bi-polar amps are typically known for having better bass response than Mosfets when properly designed. As such, one would think that they would sound "warmer" but that is typically not the case. Mosfets are typically "softer" sounding to start off with and, as is the case in most "mass produced" electronics, the lack of gain matching in Bi-polar output devices can tend to make them sound hard or bright. Lack of "gain matching" in bi-polar based amps is why most of the SS "muscle amps" of the 1970's and early 80's sounded so "transistor" even though many of them were capable of excellent bass response. Sean
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