Axiom Home Page Forums General Discussion Technical Questions Connecting EP500 to line output of receiver.

The new subs with the combo XLR/RCA jacks don't use an XLR to RCA adapter anyway. There's just a 1/4" phono hole in the middle of the XLR where an RCA-female to phono-male adapter is inserted.

There's no way to adapt an unbalanced RCA (which is what receivers put out), into balanced XLR (which what the Axiom subs use) with just a cable. You need active electronics--the sub has those electronics inside when you use the RCA input.

If the RCA inputs are not working, there's a chance the sub is broken. You said you bought it used? While Axiom will more than likely provide some testing ideas on the phone, you won't have any warranty support.