Anyone hear Dynaudio subwoofers

I'm using dual Sub 500 units in my stereo system. No HT here. They blend very well with my full range speakers, adding those trailing bass notes to kick drums. They make music 'fuller'.

Thanks Bigbucks. Which speakers? Can the internal crossover be bypassed to use an outboard bass management unit? HOw big is your room?

Evidence Temptations.
Yes.
15x18.

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