Thanks Dave.
kalali, every dc power supply I have tried sounds different. So make sure the voltage and power rating is correct for the unit and then listen. I have tried three different supplies to the Lumin D1 player, the Sbooster was the best out of those three (12v supply). That's not to say that is the best because I haven't tried the Uptone LPS1 or Paul Haynes power supplies yet.
With regard to the Aqvox switch it comes with a wall mart type ps which Aqvox say has been optimised for the job. However, I'm finding a sound quality improvement with an alternative ( and more expensive) King Rex ps (5v). I am going to test the Uptone next week. There is currently a thread devoted to this switch on Devialet Chat but perhaps I should start one here? An Aqvox customer in Spain has tested the switch with the very expensive Kenneth Lieu ps, which according to his view improved dynamics but he found the standard ps to have a better and more natural balance (discussion over on Audio Shark).
I am currently using a 12v Sbooster to the IP hub, which has again improved SQ.
A number of people say that Paul Haynes makes some of the best dc power supplies.