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Well by improving the shielding on the power cord all the way to the plug and incorporating a metal foil tape over the remainder of the exposed wires. This was all encased in adhesive heat shrink tubing. Noise went down substantially. I also got a very high quality patch cord for the line out to the AUX in to the Panasonic Stereo.
I picked up a Creative USB Audio output port. I thought the line out direct sound was great (when no noise was present). Well I was wrong. It is hard to describe, but the sound has a lot more depth and almost all the noise was eliminated. It was worth the experiment. Output sound is now better than when sourced with CD's or XM.
It seems that most of the output lines will radiate a bit of noise from the P1900. So I will go back with some shielded wire we use in avionics installations to eliminate any possible remainder for the power button line.
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