I decided to pair the Canadian Funk with the Brit Diamond.
This is truly high quality bass. Just accurate, tight, deep, powerful, forceful, bone-crunching, gut-felt bass.
But I have to confess. I did not use the dual Crown XLS2500. I used the 2 channels from the AT2004.
For an SPL level of 75dB @ 3m distance in my room, the Denon 3310 speaker channel level for the Funk subs was -10.0. That's MINUS 10.0.
As a comparison, the dual RBH SX-1010N was set to -12.0 for the same SPL on the AT2004 & Denon 3310. So I guess the RBH subs are a little more sensitive. On the single Crown XLS2500, Stereo Bypass mode, at 100% gain level, the Denon 5308 channel level for the dual RBH subs are @ -12.0 for the 75dB SPL.
Anyway, the dual Funk 18.0 TSAD are fantastic. Truly high end caliber subs.