I just have this 1/4" plug that goes into the sub xlr/phone in(step 1)...the problem I have is that my coaxial cable don't seems to fit on the female end of this RCA plug...do you guys have to force the coaxial (male) cable in to that RCA plug female end....I never seem one that just doesn't slide in ...hmm its only one adaptor that come with this sub right??? I'm so frustrated I thinking of sending this sub back????

It's no use carrying an umbrella, if your shoes are leaking.