Hosa Y-Adapter Cable
Crutchfield Customer Review (What's this?)
Works great. Only 2 problems: It's only 3 feet long. Too short. Many folks will use this adapter from the sub out on the amp to the subwoofer. Try to find at least a 6 footer. Unless your amp is sitting on top of your subwoofer. Problem 2: too loose when pushed into the rca port. I had to use needle nose pliers to squeeze the "fingers" closer together. It made the connection tighter, but not tight enough. So Crutchfield, please try to address these 2 issues listed above as most folks will experience the same. There has to be a better cable out there, even if it's a few bux more.