I recently purchased a pair of A2s with the silicone stands. Love the speakers, but I am not a big fan of their sound driven from the 3.5mm jack on my Macbook Air. I bought an Audioengine D1 and thought I could hear a noticeable increase in sound quality (all music FLAC), but am I imagining this? I have read mixed things on this site about whether the A2s actually benefit from a DAC.
Anyway, if I use the RCA outs on the D1, the instant I connect the USB cable to the Air there is feedback from the speakers. I tried 2 different RCA cables and an RCA to 3.5mm, and each time there was feedback. It doesn't happen when I use 3.5mm to 3.5mm, but I don't want to use that because it means I've got a cable running from the front rather than the back. It kind of upsets me that the D1 is doing this. I am probably going to return it. Any thoughts?