If your sub is a long way away or has a potential ground loop (ie plugged into a different electrical circuit) you should would be best to use a transformer to convert from single ended to balaced. Then run an inexpesive balanced line to your sub. The transformer will balance your line and match the typical impedence of a balanced line. This will reduce potential ground loops and you will benefit from the common mode noise rejection provided by a balanced circuit. Blue Circle, Rane, and a bunch of companies that specialize in studio or professional audio make them. For a subwoofer appication you don't have to spend a lot.
rca to xlr - best way?
connecting a sub out from my receiver to a sub amp. receiver output is rca, but the inputs on the sub amp are xlr. what's the best way to convert? adapter? a cable? does anyone manufacture cables that convert rca to xlr and vice versa? really could use some advice, as well as an explanation as to the benefits of xlr connectors. thanks