What would happen if EQ them all to FLAT? 
HD490Pro HD560S HD600 HD650 HD660S2 HD800S
The headphones were EQ´d to make them sound neutral flat. The author did not mention the amp used.Lossless files
https://www.youtube.com/redirect?ev...lq21Ap3YGUg3CLhd9Tn?usp=sharing&v=tonSYezqHnw
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