All the hoopla about FLAT for recording is probably true. I hated the HS8s and unloaded asap. I mix through the 650s entirely and would never use a monitor again.

And for anyone recording on the skinny - I use the Tascam DP-03 CD and the results are truly fantastic. I paid $99 and am blown away.
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Yamaha 920 / Yamaha DGX-670 / Maui 5 Go (2) / Senn e935 / Sony C80 / Tascam DP24sd / ATEM Mini Pro switcher (studio)