I bought my e30 back in April of last year and I've been using it with my PC and headphones, never had issues with popping, and was not aware of polarity issues then.
Now I just moved it to living room with e30 right into nc252mp to dbr62s, using e30 as a pre-amp. The pop when turning the unit on/off is fairly loud, is this something that was fixed with updates? My firmware is up to date. If not fixed, should I worry about it causing damage?
Additionally, now I'm using optical and coax inputs as well, should I be worried about the polarity issues?
Last, using in pre from -50 to -15, typically -30. Is that too much digital attenuation?
I know this stuff may have been answered I just don't have time to dig through 200 pages!