I replaced the Pro iCan's stock power by newly purchased iPower Elite. Unfortunately, the iPower Elite introduced background noise. This was how I tested the background noise: used 18db gain in iCan and turned volume to max (DAC was off), I could hear lots of noise introduced (the higher volume, the higher noise floor). When I switch the Elite power adapter back to the stock one, my iCan became dead quite again. I think there are two possibilities here: Elite introduces noises due to Active noise cancelling mechanism (need to create negative phase noise to cancel positive phase noise) and/or due to that my power circuit does not have Ground. I don't have a ground from our power outlet: I use a 2-prong to 3-prong socket adapter to power my system. Anyway, Elite does not work in my case unfortunately.