So I'm new to audio and I have all klipsch speakers ran to an onkyo tx nr797 receiver everything works great no issues I also bought a dayton um18 subwoofer in the sealed build yourself box and here lies my problem lol. I got a rockville rpa16 amp and built my box and wired the sub in series I think its called where I connected negative and positive from opposite sides the the other 2 neg/pos to my terminal. No clue if that was right or not but that's how I did it. I bought a cord that was an xlr to rca connector because the amp took xlr and the receiver seemed to only have rca sub output. So I hooked it up fired it up and it was working I guess but just barely and when I tried turning the dB up and volume it was clipping like crazy and shut off.. I just quit Messing with it out of fear of blowing something so I figured I'd ask here for someone with actual knowledge willing to guide me a bit. Appreciate any help and im dying to get this baby going and hear it!! Thanks