Howdy all,
I recently purchased the MD606T. Previously owned the Polk. Did not run it through a separate DAC.
Comparisons between the two units. They aren't even close.
The MD certainly shows the limited bandwidth / upper frequency response inherent to XM but on the stations I listen to, which are the Classical, VOX, Real Jazz, and the Beyond Jazz stations, the sound is engaging / dimensional with a liquidity that sounds quite analogue in nature. Can't provide input on the other stations because the quality you hear or won't hear is station / track dependant.
The mid bass, lower bass is fully fleshed out, voices are fluid, and overall musical presentation is suprisingly good.
FYI, my system consists of the Martin Logan Summits, Pass Labs 250.5 amp, Conrad Johnson Premier 18 LS preamp, the Esoteric SA60 CDP, and the Furman Elite 20Pfi PLC along with Mapleshade and Cardas wiring.
I really didn't expect much after my experience with the Polk unit so I purchased the MD through Audio Advisor, which offers a 30 day money back guarantee.
Units takes two to three days to burn in but once that's done, be prepared to be pleasantly surprised.
Highly recommended.
GG