Originally Posted by richmond5
Bought a used SMS-1. I used to have a DD12, so I know pretty well how its work. The first thing I noticed by XLR( same with RCA) connection, there is a very weak rumbling noise coming out of my subwoofer even when SMS-1 volume is set at zero. Any suggestions?
The first thing to try would be to run a factory reset by pressing 1-2-3-4-5 from the main menu screen. Be sure to use the number keys and not the preset keys. After you have run the reset you will lose any settings you had established. Power cycle the unit and see if the rumble remains. If it does, power off the SMS-1, leaving all the connections in place and see if the problem stops.
Disclaimer: I am assuming....
1. That you have already tested the subwoofer with XLR connections direct from your pre-amp and the problem does not exist with the SMS-1 not connected.
2. That the input source to the SMS-1 is XLR to XLR, you are not using RCA to XLR adaptors.