I've heard the Ref. 3 and Ty's Linbrook, which resembles your Thor. I own the Ref. 1--which uses a single W17 like the Ref. 3. I haven't noticed greater orchestral density with the MTM arrangement. The Excel is a very expressive driver, and it's probably a challenge for some HF and LF drivers to match the level or the dynamics of even a single W17. Because the MTM can't go as deep as a well designed three-way, it isn't surprising that the balance on orchestral music isn't quite right. On the other hand, I heard serious orchestral confusion even with a woofer available on the original Gallo Ref. 3. In that case, it might be because of using lesser drivers or as an artifact of the MTM design.
I haven't seen professional reviews of the the Ref. 3, but Stereo Times has one of the Ref. 1.
I haven't seen professional reviews of the the Ref. 3, but Stereo Times has one of the Ref. 1.