I don't think I missed a thing. You just want me to judge the guy. Nope.If he likes more bass, he needs headphones with more pressure capacity. You can praise the HD560s if you want, whatever. If you convince him to give them another chance and live with them anyway it's fine, if not - that's fine too.

I was describing them in the context of his message, which is related to headroom. Headroom doesn't care how the bass is tuned. It can be 6db below baseline, as long as there's headroom, it'll deliver. HD560's are the same kind of driver-earcup-earpad combination as other Senns and it doesn't have any more headroom. It's tuned differently, but the displacement just isn't there for bassheads.

Refer to distortion plots to see how HD560s is more stressed than HD660 for example. If you tune the bass up, you get less headroom - as simple as that. If someone is a heavy listener, then no amount of petty remarks towards them will change the fact that there is no replacement for displacement.