I use C4 GRANITE 2 years, I replaced the 4 boomers of origin by the rcf LF15N401 (900wms and 1800w in Crete, the woofer is 3600wrms per box), I fed with bridged Crest CA 6 and I can say that it works very, very strong, sound and accurate with a nice roundness.
I just try different subwoofers, and I just tell you that this kind of lot ...
These boxes are the Special features of being compact enough for 4x15 inch per box.
Weakness:
- The weight
"He is no longer in the catalog in granite
With experience, I recommend these boxes.