Gold Supporting Member
Haven't had a chance to read all the replies yet, so this may get edited, ha! The Zuma is a pretty sophisticated power supply, such that, when I had one of the channels go out on mine (caused by a loose screw inside the unit) XTS here in Nashville wouldn't fix it... lots of proprietary bits, and a unique design... all that to say I doubt it's the power supply.So I have a hum.
Last 2 times I played the sound guy told me I had a hum. And me looking perplexed, didn’t know why it was there and I couldn’t really hear it. And then today I had decided to try an iem wireless unit I just got in. What better way than to test it with my rig right? Set up my HX stomp with the volume fixed as I do for FOH and adjust the gain on the iem unit. And there. There is the hum.
Really apparent with gain but even somewhat on my clean sound. I touch the individual foot switches and the hum gets quieter. I touch the foot switches on the HX stomp and it gets louder/worse. I touch my furman powerstripand everything goes dead silent. And yes touching the bridge or the strings kill some of it as well.
- everything runs off my zuma
- I checked and unplugged power from every pedal one by one
- I checked the cable ends
- I ran the HX off a separate power supply and it was worse.
- I tried a different cable
- I tried a different power strip
- I was at home, at my desk
And very defeated. All I was able to do today was turn on a -48db noise gate on the input of the stomp to mitigate this ground loop hum. I don’t know if I’m going to be able to fix it, but man can a grounding/power issue sure make good gear sound like crap.
I tend to think "ground hum" is rarely a grounding issue (especially with a good power supply and discreet power for every pedal) and is typically an environmental issue, or combination of things.
Are you running a compressor after your gain pedals? If so, try running it before your drives. Depending on the compressor you'd be surprised at the noise they can drudge up from the pedals before them (another reason I run mine first in the chain). If that's not it, it may be environmental... dirty power, or local RF.
Try this... go to a different room on a different power circuit (check your breaker box... preferably one with no computers or ceiling fans - no electronics at all would be ideal) and try it in there. We have a small campus where the stage power is on the same circuit as the stage lights. It doesn't matter what I do, between the dirty power and the RF from the dimmer switches, I get some hum, even on my humbucker guitars. If it doesn't go away in a different room...
The next thing I'd try is a different power supply, meaning somewhere other than your house or church.