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I purchased a Matrix Audio Mini-i DACV/preamp/headphone amp about 18 months ago from Tam Audio and have enjoyed it until recently. The headphone amp seems to be shot - it is absolutely unlistenable although the unit continues to function just fine as a DAC and preamp. This makes it unusable for me and I have already replaced it. Anyone of you DIY types who are interested in trying to repair this unit or if you're in need of a decent DAC, please send me a message here.