I have two SB Touch and two SB Radios. I read a lot about changing the PSUs. Any advice/experience on what this would cost, where to buy and any opinions on the range of result one might expect on a Marantz PM6004/MA BX2 system. The network is Asus Black Diamond router, Devolo powers LAN plugs, Netgear switch, Lynksys switch and WD Nas. All are plugged into off the shelf 6x sockets power cables straight into wall sockets. AtAt