I agree there should be a little more room between the RCA connection points. They certainly dedicated plenty of room between the XLR connections. As you said using the outlaw PCA cables which have a larger circumference than a standard RCA makes it even tighter. I noticed things were cramped when I first hooked up. However it wasn’t until I went to unhook the L/F main, to test a two channel amp, when I really noticed the problem. There was not enough room to really get my fingers in there so I could loosen the connection, I had to(delicately) use a pair of needle nose plyers to loosen. Not the best scenario.