Hi folks, this weekend I'm going to try recording live drums. All the other tracks are already laid down, and there's a drum machine track, so basically the drummer will need to monitor the existing stuff with a pair of headphones ('cause the drums will be mic'd). My monitoring board (a Mackie CR1604-VLZ) has a headphone output, but it's not very loud, and I also don't want to destroy my studio 'phones by driving them too hard. The question is, what's a good set of headphones that I can drive "loud", that will suffice for the drummer to get whatever volume he needs for monitoring? I can provide an external headphone amp, no problem there. The headphones should have good acoustic isolation so I don't pick up unwanted signal through the drum mics.