How about moving the switching supply about 10 feet away? I could then run a lead from the DC output to the connections for the devices. Isn't the noise radiating from the supply? If so, moving it should help, right?
These wallwarts are still a bit of a mystery to me in how they provide their power. The FM Transmitter had a 12V .5A wall wart, but setting the switching supply to 12V created a problem with the transmitter locking on the frequency. I had to bump up the output to 13.8V to make it work properly.
I'd like to keep away from the wallwarts as they take up way too much space and create a wiring nightmare. I'm back to them, temporarily and now have 4 of them and three standard AC plugs. It looks just like the electrical octopus the fireman told me never to create back in elementary school. 
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Pioneer SX-1080, Pioneer PL-115D, Pioneer CT-F9191, Pioneer RG-1, Wollensak 8050A, Akai 4000DS MkII, Pioneer CS-05 & Polk 1.2TL
Denon 5803A, Pioneer DVL-700, Pioneer CT-W603RS, Toshiba HD-A3, D-Link DSM-520, Dish VIP-722, Polk 1.2TL, CSi5, LS/fx, RT-800 and PSW-650
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