The hum issue has nothing to do with XLR connections. If the Mini DSP is better in this regard, it’ll be because it doesn’t use grounded electrical power.
Well, the problem on the 1124 is solved by using balanced XLR signals the whole way. The XLR connections aren't causing the issue, per se, it is Behringer's design (with grounded chassis) being incompatible with most/many/some (???) AVRs that output unbalanced via typical RCA.Nothing to do with XLR? I read that on post #2 of the thread!
Several pages back (and years ago) Wayne provided some very good information on how I could make an adapter. It worked great and totally solved my hum problem (which was significant).I returned my BFD in favor of a MiniDSP because I couldn't deal with the hum issue. I tried everything I could think of at the time with no results. I just had another thought has anyone ever tried grounding the BFD to their AVR phono ground (assuming they have one)? Could this work?
Several pages back (and years ago) Wayne provided some very good information on how I could make an adapter. It worked great and totally solved my hum problem (which was significant).
3-pin XLR-F to RCA plug. Perfect for connecting a source with a balanced XLR output to a device with an unbalanced RCA input. Pins 1 and 3 are shorted with no connection to the shell. Note: This connector is not impedance matching.
In looking at the diagram I saved as a reference to what I had done, I have squiggly lines through the wire coming off of pin 1. I think that means I do not have it connected, but can't be sure. I also have written on the page "center pin 2, sleeve pin 3".Now have hum issues..not only on the sub.
I've disconnected pretty much everything in my system and it's still there. I'm wondering if it's my power conditioner, Belkin PF60. I just installed that a few weeks ago and that's basically when the hum started in my rear surrounds. It has a ground point on it but I don't know where I would ground it to other than running a very long cable from it to the basement grounding point for my plumbing/ direcTv.
Could I run grounds from each of my devices in my system to the ground terminal on the PV60 so they're all terminated to the same point?
I'll go ahead and modify my rca to xlr cable like you did lovingdvd to see if that at least makes the sub no longer have the hum. It's slight but there.
I re-read your previous post and had a question. Which one did you end up doing below?