Audiophilepure

http://www.digitalaudioreview.net/2013/12/red-wine-audio-signature-57-integrated-amplifier-review/

“Red Wine Audio runs at you with difference. And the single most obvious differentiator is battery power. Power supply noise makes not a jot of difference to Red Wine Audio’s amplifiers; with the battery handling all the heavy lifting, wall socket additives don’t ever make the jump to the modules”