please take note of the suggestions I mentioned in the D9.2 run in thread.
however amplifiers and tubes (with tube amps) do also make a difference.
My D7s sounded excellent with a Rogue Audio Cronus Magnum II as well as a Rogue Audio RP-7 preamp and Stereo 100 amplifier. The RP-7 and Stereo 100 are very dark sounding pieces.