Everything in your studio, including the furniture and you, affects the sound. Amps, in particular, should add no "sound" to the sound. To do that, they should be more powerful than you'll ever need so they don't clip on transients/overloads, which not only sounds bad but can destroy tweeters by overheating the voice coil due to sustained DC levels and the resulting high current. An amp should be essentially a "straight wire with gain", meaning what goes in, comes out (only bigger)... Steve