For what its worth, I always thought the X350 sounded much better than ML's 336. (I used to own the X350 & X600s.)
The 350.5 has been improved, while IMO the ML has slipped. Further, the Pass has better extention (top and bottom) and is more true to your source. I always felt the ML 300/400 series were a bit rolled off in the highs. Cabling is going to play a big part.
The Pass - Theta synergy should be great and your Dynos are going to convey whatever goes into them exceptionally well. Good Luck.
The 350.5 has been improved, while IMO the ML has slipped. Further, the Pass has better extention (top and bottom) and is more true to your source. I always felt the ML 300/400 series were a bit rolled off in the highs. Cabling is going to play a big part.
The Pass - Theta synergy should be great and your Dynos are going to convey whatever goes into them exceptionally well. Good Luck.