The basement of my house had coax cables installed for 2 subs prior to me moving in. I recently bought 2 subs and I'm having trouble getting them to play. When i initially went to plug the pre-wired sub cables in to my receiver, the RCA plugs pulled right off the cable on both connections. So I bought new RCA crimp plugs and a crimp tool and crimped 2 new RCA plugs on (admittedly I didn't do an awesome job, but believe I got them crimped on well enough - so this could be a source of the issue). I also bought 2 coax to RCA converters that I connected at the wall outlets and then ran traditional sub cables to both the subs. Neither works though - one hums, the other has no sound at all. I haven't had a chance to actually test the coax cables, as I understand it I need specific equipment for that? I was wondering if anything I've done would jump out as a potential problem? How finnicky are the RCA connections? Would the coax to rca converter at the wall impact this?
I have connected both subs directly to the receiver and they work fine, so I can eliminate the sub cables, sub and receiver themselves. Thanks in advance for any advice.