Tbh I cant tell a difference at all in sq with any of my headphones except maybe my brainwavz m1s (sounds like soundstage widened a little, but that could just be all in my head). Right now its pretty much just a volume booster because my files are affected so much by replaygain 
Thanks, yeah ive seen the ones on ebay and im tempted to go back to oem f/w from rockbox for a while to try it out







































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