I know but that's not really the amps fault. It is fully DC coupled, very fast and with more then enough power to never be bothered by the load presented by the panels (short of trying to drive the Jecklin Floats which it probably could do though) so pretty much straight wire with gain. The Stax Omegas, 4070, Sigma's, the better Lambdas (pretty much every Stax headphone then) and the HE60 welcome this but the HE90 needs a more sympathetic match to "polish" the sound a bit. Choice of music and the volume level are also crucial factors here.