I have found an improvement in SQ between my two digital music sources

Thoughts on the OPA627 pair on riser boards?
Some say that's the best of the TI op amps. I'd still rather go with discrete FETs from companies like Burson (tall red modules). The Music Hall still can't match the Audio Research DAC8, but it is closer.

burson2.jpg
 
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Some say that's the best of the TI op amps. I'd still rather go with discrete FETs from companies like Burson (tall red modules). The Music Hall still can't match the Audio Research DAC8, but it is closer.

burson2.jpg

Nice! I personally think that the biggest gains to be had in a DAC are actually in what you're doing with the signal AFTER it's been converted to analog, hence my interest in the opamp choices. My natural skepticism leads me to believe that any DAC chip with sufficient SN ratios and dynamic range capability, referenced by a sufficiently stable Vref system and sufficiently buffered inputs/outputs will have similar performance to any other. Conversely, it is quite possible to screw up an analog signal with poor quality components/bad buffering/poor impedance matching/etc.
 
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