Quietest amplifier you have ever owned.

Bobgates, first of all, I didn't say "all you have to do is start tweaking". I said that all tweaking is attempting to repair a perceived or real problem in your system. Noise in a properly set up system is not usually a problem - just because you hear some noise when you have your ear right up to the speakers doesn't mean that you have a problem. Some do think that this is a problem and they will start "tweaking away", cables, amps isolation platforms ad nauseum. If you hear noise using the method that I have described it is most probably due to a bad front end set-up or matching with the power amp, with the pre-amp not doing it share of the level gain and using the power amp to do the bulk of the gain. This is especially critical with high sensitivity speakers.

The key to quietness at the speakers is amplify the signal as much as possible, without distorting it of course, before the power amp. Therefore the amp increases the gain less for the same speaker output and therefore is not amplifying the noise that is being introduced to it by the upstream equipment. Obviously you need input attenuators on the amp to be able to accomplish this. Some will say that the attentuators will affect the sound, even if the attentuators are part of the amplifier design.
Most power amps are quiet enough if they are matched correctly i.e. proper impedence loading and in put sensitivity matching. The term quietest amp is irrelevant and meaningless - what you want is low system noise as perceived at the close to the listening station.
I am with Pbb, if you want quiet, go to the mountains and don't turn on your sound system!

How to determine if your system/component has sufficiently low noise? Simple. Play something at realistic (or desired volume) levels, then stop play and, at approximately half the distance that you normally listen to your system, listen and note if you hear any noise. Depending on your source, you might hear noise or not. If you don't hear any noise, great. If you do hear noise, also great, now you can start tweaking, which is what tweaking is all about, repairing an audible or perceived defect in the system.