I have a pair of HD598s and have decided to start using them more. Sadly, the headphone section of my Pioneer Elite VSX-21TXH cannot drive them to a loud volume level without distorting badly. Even my 5th generation iPod Touch sounds much better, so I know the phones are good. I ordered a Schiit...

I know they're rated for 70 dB SNR, but are they really supposed to have so much hiss? Even at the lowest headset volume, it's loud; it reminds me of a non-Dolby cassette from the 70s turned up pretty loud. It's easily audible over pure dialogue and low level background noise. Turning the...