erikweber321
Auditioning
- Joined
- Sep 1, 2014
- Messages
- 9
- Real Name
- erik
I inherited a home system with a Velodyne SPL1200 subwoofer and a DSP-A1 receiver. There was a monster cable that was frayed at both ends (indicative of shield dmg?) which was used as the mono sub-out connector from the receiver to the (powered) sub.The monster cable pulled out the female RCA jack metal piece from the receiver unit.Using the frayed cord, the sub produces a hum (that sounds like a ground loop issue). This happened at all times that the frayed cord was plugged into the sub, whether it also was plugged into the receiver, whether it was using a Y-connector on the sub (for the LFE + input) or not.I wiggled the connection of the frayed monster cable at the sub connection and at one point I got it to go away, but then it came back. Jiggling would lessen the intensity of the hum.My diagnosis is that the cord shield was broken and not allowing the sub's ground-claim to sync up with the sub's own ground. It wasn't due to units being plugged in wrong - the sub + receiver are 2-prong and in the same outlet (and tried others and combinations to no avail).I replaced the monster cable with a 13$ walmart subwoofer cable and the hum is gone (presumably from a cable with an unbroken shield that allows for a proper ground). The hum is gone.There was no sound before, but there is still no sound. This is my first home entertainment system I'm setting up, so I may have looked over something.Other speakers work fine.The sub is hooked up to the Mono rca out from the receiver, and the sub-end connection comes to a Y-connector with the original lead going to the "right-red" input, and the other end of the Y going into the "white-left" (or just plainly LFE) input.The connector at the receiver had pulled out at one point as I mentioned. I put the female part which had pulled out back inside the port. The female metal part which pulled out looks like a small metal sleeve with 2 flat rounded prongs with teeth sticking off of it, to be clear.I need advice on what to do. Why is there no sound to the sub?? Can I test the sub port with a multimeter to see if there's anything working or if it's a dead port? Can I fix the dead port myself with basic electronic soldering? I really need a miracle. I inherited a ~10 grand system with this ONE defect and I'm dead set on fixing it. What is it without a subwoofer right?