Just recently installed a new Onkyo receiver with class D3 amps. After a few weeks of use I can say that the sound quality of the D3 amps sound the same as my previous AB class receivers did. I know there is resistance from many old school users but is this justified? I've seen comments that class D frequency response can not go as low as A/B switching amps but if that was true then why have many high end sub manufacturers been using class D for some time now. I've also read some say class D is noisy but I can't hear a sound out of my speakers unless I crank the volume well past any reasonable levels and sound quality as I said earlier is as good as I've ever heard. Thoughts?