I've used the following each for a couple of months HiFace, Halide, AP2, AP2 + PurePower. AP2+PurePower is better than AP2 which was better than the Halide and HiFace.
@Devilboy yes, haven't updated my system for a very long time. A lot has changed - coincidentally the only constant has been my speakers and AP2, now with PP.
@devilboy, I tried a Vaunix USB hub with an AP2 which brought improvements to mostly bass and mids clarity. Adding the PP added more of the same but expanded the soundstage width, depth and made everything sound bigger. At that time I was using an Anedio D1 and later a Neko D100 DAC. AP2 can be upgraded to support PP.
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