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My K7XX are a good deal quieter than my HD600; is it the same for everyone else?
Hd600 is higher impedence, do you have a tube amp? They generally put more power into high impedence headphones.
At 300 ohms, it's more a matter of voltage than power. A solid-state amp running on 15 or 16 volts can drive an HD600, but an amp running on USB power can produce poor sound.