Like I said, Thank you all very much for your input. I worked for NASA Jet Propulsion Laboratory for 30 years Building Test equipment. I built a Tube lab amp recently that I split the circuit Brd and built it as two units. Power supply in one box and the amp in another. Built speakers ( Madisound BK-16), and DAC, and had a custom Quasar CD transport built, two bucket subs and bought a Crown Amp for the subwoofers System sounds great, but my wife doesn't like my music. So, I only listen when she goes out.
She saw some headphones on a shopping channel and had to tell me about all the people calling in about how great they were. And I should get a pair so I can listen whenever I wanted to. So that got me looking into Headphones and head amps. Decided on the Mainline because all the great reviews and I can build it. I love building Stereo equipment. Thanks again. Can't wait to start this build with you guy .