With the introduction of transports like the Allo DigiOne and USBridge, single board computers requiring power supplies able to deliver about 3A at 5VDC or less are becoming increasingly popular as stand-alone music server or as S/PDIF and USB network renderers. Some contributors to these forums have argued that improvements in sound quality that can be achieved by powering single board computers with high quality power supplies. What are suitable high quality power supply for single board computers? Has anybody compared UpTone Audio's JS-2, Custom HiFi Cables' DC3, Paul Hynes power supplies, etc. to less expensive wall wart power supplies like the ifi iPower and the Allo 5V/3A? If so, please, report your findings!