I decided recently to return to my original 2 channel roots. No more surround sound, roomful of speakers, etc. After doing a little research I went back to two brands I had fond memories of, NAD and Bose. So I set up a NAD C 375BEE Integrated Amp and a new pair of the BOSE 901 Series VI, Version 2. What all this has to do with this thread is I'm listening to a favorite jazz piece on the K812 using the NAD headphone socket. This sounds so damn good I'm beginning to think I really don't need a headphone amp. On my previous setup, using a Sony 5800ES AV reciever, the headphone jack never sounded that good. This NAD is a whole different story. This is only my first cd played like this, so I'll have to give it more time. But out of the box, it sounds like a winner. ( Anyone in the SoCal area interested in a great deal on B&W CM series speakers, please PM me).