Anyone have suggestions on what would be a good match, sonically, to my Thiel's .... I have a Pass Labs X150 now, I wonder how a tube would sound, or maybe a D-class amp (as they probably sound the same as the volume goes up, unlike class A/B amps)..... The Theil's have a wonderful tone to the bass, the thought of a D-class amp seems like it would be great for the bass, but will the mids/highs be up to par, compared to my Pass? Thoughts? Suggestions? Thanks!