I have no idea what ohm does, but with 598 the distortions start at 35-40% volume when there is heavy bass. But they are also twice as loud, if not more than twice as loud as the HD6xx, but only with sxfi. With ZXR and GSX they are about equally loud, and free of distortion.
I guess something is not matching on the ohm rating that causes the 598 to rattle with the sxfi.
I guess something is not matching on the ohm rating that causes the 598 to rattle with the sxfi.