better than the gs-x mk2?
LCD-2 do not have bass impact, it's more of a bass tone in favor of not distracting you with one particular bit of the range. It's less fatiguing to listen to that way as well.
The magnetic field doesn't move air the same way to give you the bass impact that a driver does IMO. It's what gives orthos their clarity since there isn't any distortion due to driver speed/rigidity but it lacks some impact at times.
Schiit Mjolnir + Schiit Gungnir, and AudioGD NFB 10.32 balanced out. Both optical-in.
Punch being mid-bass impact, and slam being the lower sub-bass impact right? HD800, HD600, K550, and HD700 are some recent ones I've tried that have it. It's not a BAD thing, it's just something I feel the LCD-2 doesn't have. In exchange you get a perfectly clear mid-range free of distortion at any volume and a very soothing tonality. Pro900 is a fart cannon, they rumble across my desk if I set them down.
I've had the headphones since the Rev 2 came out, multiple times. It's just that other headphones do a couple things that 2's dont, and 2's do things that really no other headphone really can :)