I am of two minds when it comes to ESL. The Stax ESL SR-007 are arguably very good to excellent headphones. On a purely intellectual, reasoned, audiophile basis listening to them is a delight; but and that is the strange "but".. I listen to the HifiMan HE560 more than to the Stax. It could be that the Stax requires me to switch cables, etc... The HE6 doesn't lose anything to the Stax, save perhaps, for a kind of "purity", the Stax has in the mid to treble, I apologize for the audiophile terminology I am using... Overall the HE6 sounds better to
me than the Stax. More balanced, serious bass(one of the best in the biz), a weight/body in the sound, I find lacking in many ESL I heard in the past.
I played this
Basoonic cut on similar (high) volume the HE6, sickening sensation but no distortion, , on the Stax bass buct not much tactile impression, the HE560 clearly distorts at some point around the 20 Hz, on the left channel.. Amplifiers were a Yamaha in Class A (CA 2010A) and Stax. for the HE6, the Atom for the HE560 . The HE6 is one heck of a headphone... Nothing fazes it, from classical to dubsteps ... For me an endgame.
My ears are buzzing from the assault. It does seem to be loud but it damn was...