Excellent advice Sugarbrie. I would advise heading over to Head-Fi.com, regerstring and posting there this same OP!
I know many of my fellow Headfiers match the DAC1 to many different types of head amps then driving the HD-650s sucessfully. The DAC1 is a fairly aggressive source which does mate well with the warm 650s , although the DAC1s headphone jack is usually found to be only fair and is easily bettered by many popular mid level headamps. One of the better headamps, which I own is the Meier Audio Corda Opera, with crossfeed, which also is offered without its DAC section sold as the Opera Analogue @ $700. Highly recommended! The Blue circle is heard to be a notch better @ about 35% higher $.$$ invested...
Good luck and happy listening~
I know many of my fellow Headfiers match the DAC1 to many different types of head amps then driving the HD-650s sucessfully. The DAC1 is a fairly aggressive source which does mate well with the warm 650s , although the DAC1s headphone jack is usually found to be only fair and is easily bettered by many popular mid level headamps. One of the better headamps, which I own is the Meier Audio Corda Opera, with crossfeed, which also is offered without its DAC section sold as the Opera Analogue @ $700. Highly recommended! The Blue circle is heard to be a notch better @ about 35% higher $.$$ invested...
Good luck and happy listening~