Just borrowed the Nuforce SE's for the 30 day trial. Currently comparing them to my McIntosh mc501 mono's(500 watts/channel). The first thing I noticed, and I have only run them for about 1 hour is that I get about a 3db volume increase above the Macs at the same volume setting. The second thing I noticed is that if there are many instruments in the recording I can more easily hear them individually. The soundstage depth is startling. I keep looking at these little guys at a third of the power of my macs and wondering how could this be. The walls are easily shaken with bass as, same as the Macs, but the purity and clarity of the Nuforce SE's is like I have never heard before. I am currently using a Pass Labs X2.5 preamp and today will run the Nuforce's through my McIntosh c2200 tube preamp. They are driving Von Schweikert VR$ SR's. I was watching the woofers displacement and I can see more fine and rapid oscillations using the Nuforce compared to the Macs. The Macs are 110lbs each so at this point my only reservation in selling them is that I have to lift them!