Tvad, I listen to everything from rock to jazz to full orchestral, mostly vinyl.
Although I don't listen very loud most of the time, (i.e. ~80-85db), my impressions of the Coincidents are based on hearing them at Trelja's home, at dealers and shows.
Trelja has tried them w/numerous amps including Atma-Sphere M-60s, Granite monoblocks and Jadis integrated. I suggest you email him for a very informed opionion on the Coincidents.
Low power and 30hz bass aren't mutally exclusive, but not all that common either. I agree w/the other posters that you might have to sacrifice something or adapt your parameters a bit to get what you're after. Cheers,
Spencer