I have the highest standards in audio quality. I am fanatical. I have dedicated thousands of hours to the study and experimentation of loudspeaker design as it related to human perception. I use pro amps in both my main 2 channel system and my computer sound monitor system. Keep in mind, I used to use McIntosh amplifiers in my main system along with various other audiophile hardware. Today, Yamaha pro amps adorn my main stereo, and a couple of Crowns and a Behringer are on my computer monitor sound system. The only thing these amps do is amplify the signal. No distortion. No noise, etc.. Keep in mind you do have to change out the fan in some of them to a quiet model. Now, 10 years ago or more, it was not all that uncommon for pro amps to have a rather mediocre noise floor. Today's good examples are superb in every aspect, including the noise floor.
People claiming some kind of coloration from modern high quality pro amps are imagining things; it's common for people to listen to something without any bias controls, thus resulting in a skewed perspective dominated by psychological reasons, not ones due to actual audible phenomena. I have no reason to waste me time concerning things that are just all in the head; others have no choice - as they are too lazy, mentally, to realize that they approached the subject with a highly flawed method/perspective in the first place. You can thank sites like Audio Asylum, Head-Fi.org and magazines like Stereophile for helping to continue this tradition of this audio foolery.
BTW, I would be surprised if even 2% of the audiophiles that have 20K dollars or more invested in their fancy 2 channel system have a system that can even come close to matching(much less actually match or exceed) my meager computer monitor speaker system in fidelity/sound quality......

This is my secondary system. I make this statement from an objective basis of measured performance vs. the common products chosen/used by audiophiles above this price range. Yet, I chose to use 'crappy' pro amps. Because they are transparent, at least the ones I chose fit this description. They have lots of power. They are priced at a point that I like. I would much rather have lots of dynamic headroom which is actually useful sometimes as compared to a pointless pretty looking faceplate and far lower actual power/capability. My computer monitor system was designed as an extreme neutral playback monitor system and it features extraordinary linearity and an incredibly low level of colorations/resonances matched by very few at any price. Of course, the environment is fully acoustically treated.
-Chris