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I owned the BM15p and TB2+ at the same time, and compared lots of material on them.
Dynaudio bass is good, but so is the PMC. I preferred the smooth transmission line bass sound from the TB2+ over the ported "whoofy/thumpy" sound from the BM15p.
The Dynaudio do not have anywhere near the midrange resolution of the PMC. There is an audible hole in low mids in the BM15p when comparing directly to TB2+. And the purity of the PMC midrange just has to be heard to understand it, it's quite a three dimensional projection.
Treble is cleaner and less fatiguing on the PMC.
I don't agree with the comment about needing larger size for more bass -- I've measured the TB2+, they will produce audio to 30 Hz, although of course at reduced output. Basically flat down to 40-50 Hz, depending on your room modes. But of course if you need 40 Hz at 110 dB you need some supplement.
PMC was more sensitive to amp and cables. I chose McIntosh MC225 and Tara Labs Prism (the old ones). Kubala-Sosna also makes great cables that work for a little brighter sound on this setup.
Carver m1.5t is my second choice in good sounding amps with these speakers. Those are the old Stereophile challenge amps that Bob Carver built to run against some Levinson monos. They sound great for my needs, but do have the (very low level) standard "t" series transformer hum, may not work for the quietest of studios.
I tried some older MOSFET Haflers, did not care for them, too soft. Don't know about the newer ones. Tried a few transistor amps but didn't like that too much either.
Steve
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