A few days ago I got this on sale for $399.  What's Hi-Fi gave it 5 stars but the reviews on Amazon and other forums are terrible.  However, the sound from this huge black box is just amazing.  I've compared its built-in headphone amp with my Schiit Valhalla and Marantz is even a tad better...

Hi all!   I have recently got a fully assembled Bottlehead Crack w/ Speedball upgrade for my HD600s.  I am quite happy with the sound it delivers but there is very distracting background noise in the right channel.  It doesn't go away even if I unplug my interconnects.  It gets louder when I...