James Shoegazer
500+ Head-Fier
I'd recommend just about any 'big name' mid to high end receiver from the late 70's. Many of the late 60's/early 70's receivers tend to be smoother with less treble...although they are a better fit for the HD600's.
I'm not familiar with the AU-907.
On the contrary the Yamaha CA1000ii which u characterised as neutral was a great match for the 300ohm HD650s, sounded way too off for the 150ohm HD600s
I’ve also been eyeing the Luxman L-550 and higher end candies for awhile now...hoping they’ll pop up in the Japanese classifieds
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