How to improve XM Radio audio quality?

Without being propelled up to XM's satalite with a bagfull of audiophile jewlery and a digital geek or two, the most cost effective way to de-grundge, re-liquify and bore a hole in the soundstage is a "tube buffer" added at the outputs of XM's digit flatulator. If ever there was a calling for the old Musical Fidelity "X" Can's, Satalite radio is it. It is amazing what a couple of small tubes in a beer can will do for modern technology.

Acually, just about any outboard (audiophile type) device will help the sound of the (self proclaimed) "new standard in Radio". If you have "Direct TV" (not sure about "Cerious") and also own a "Tivo" unit, there is one of those slimy little "optical" outputs that will interface with some Dac's. I happen to have one of the worlds cheapest, oldest and (arguably) worst Dac's around that is fitted with with an "opt. in." (quesses anyone ?), and it still improves the sound of the Satallite radio.