I had an old accuphase E406 for more than a year, with ma4 from the dac, and the Dig3 from the link. It's sound was so smooth and detailed without any harshness in the highs at all. I had some listening sessions that lasted 4 to 5 hours and never felt fatigued. I had since sold it and still miss it till now. Wonder what other amps would you guys recommend? I have now the SP5 and it has improved my current set up a fair bit. I'm using the Marantz cd6004 and KI Pearl Lite amp.