I have a cheap Emerson radio/cd player that takes regular (no subwoofer) speakers, one red wire, one black wire clips into back of unit. I want to use my RCA Kevlar with built in subwoofer speakers. The RCA has 2 wires each having black/red (4 ends total). Can I twist these together and put into the clips? I mean, I tried it, and it works, but don't want to destroy the system or the speakers.