I had the C1's in an 11 x 13 room with both the boulder 800 and 1000 series amps. The 1000 series was able to control the low frequencies much better than the lower powered 865. Your problem is going to be in the low/mid bass overloading that room. I had tons of bass traps in there and it still was bloated and overloaded. IMO, the problem is the rear facing port in a small room. I now have a sealed speaker and my mid-bass problems have been solved while actually getting "deeper" extension. I used an RTA and if I remember correctly the hump was at about 65 htz. That being said, the C1's are still awesome and some days I regret selling them. I had mine about 3ft from the front wall, approx 6ft. apart with moderate toe in.
