D amps

+1 @atmasphere, I agree it is the overall design of the amp that makes it sound great.  

Hello bernal737  May I recommend the power ampss from Starke sound?  They make 4 channel and 8 channel amps. They make their own modules. I have six of their four channel models and they drive the Linkwitz 521-4 systems superbly. I also use them with Magnepan LRS, LRS+, and the Golden Ear BRS speakers. They have an iorn grip on the speakers they drive and give excellent results with everything I connect them to. Dayton Audio has a very tiny 2 way kit using passive radiators on each side and it sounds very well when the Starkes drive them. I also have two of the Purifi Audio EVAL-1 kits that sound very good also. But the Starkes are just a bit smoother and sweeter on the top end. Starke gives you a trial period also. Highly recommended. Happy Listening! 

Y'all haven't heard ClassDaudio.com amps yet looks like. I own two. Fits in your palm, 5 lbs, & are dazzling. Cheap too.