Anyone hear Dynaudio subwoofers

Have the Sub500 here mated with the Focus 220/140 for an HT setup. However, I also have the Confidence C1's and have tried it them as well with excellent results. I do have a treated room.

I find that it's very musical and very fast. The Sub300 is equally as good.

10 year thread bump Swampwalker 8^0

Found Two - New Old Stock BM12s in a Studio. never out of the boxes.

Specs

18hz - 250hz.

12" woofer
Phase adjustment in 0° / 90° / 180° / 270°
Remote Control, Subwoofer level control
Adjustment of crossover frequency ranges
Storing and recalling presets
Low frequency extension adjustment
250 W amp

I think the amp is class A/B by the size of the heat sinks. No info available on it.  They would only be used for 60hz and down 2 channel music in my second room. They are a good price; are they worth pursuing.. or should I move on? 

thanks in advance for any replies.
Cheers 

Thanks, CT for thinking of me.  As of now, I am running active bi-amplified OB speakers w 2, 10" woofers on each baffle, driven my 200 wpc crown class 2 amp.  Haven't cheked it out w pipe organ, but no sub needed for any other use, IMO.  But I appreciate the time you put in to your response. 

IMO your better off buying a JL audio or Rel having had all three

Another vote for REL. IME, these are the most musical and best "sub" in the market. Add easily integrates into any system.
Keep me posted and Happy Listening!