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Old 01-15-2013, 08:58 PM   #1
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EchoPark93's Avatar
Join Date: Aug 2012
Upto Whola lotta hum! Dual amp setup

Hello internet,
My amp done hum like ah bitch!
I play in a rock 2 piece, im running a dual amp setup and seem to have perpetual hum/noise which is cause by the amps fighting for earth (so im told)

I've check all my cables, power supplies, pedals but no dice.

I could really use some help eliminating the noise.
Can anyone recommend any pedals that would help?

A ABY style pedal would be no help as i use both amps for dirty or both for clean

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Old 01-15-2013, 09:22 PM   #2
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Join Date: Feb 2006
Location: Montreal
What do you mean, an ABY is out of the question? How the hell are you running your setup?
The way I do it is dirt pedal -> ABY so that the same distorted signal is sent to both amps.
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Old 01-15-2013, 09:52 PM   #3
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Join Date: Apr 2008
Location: Salisbury, Wiltshire
Getting a clearer idea of how you've got your rig set up certainly would help, but right off the bat, I'm thinking either you're cranking the gain around things which induce extra hum—neon lights, computer screens, mobile phones, TVs, radios, etc—or your power supply/wiring wherever you play is a bit dodgy. I've never heard of amps generating excessive noise because they're "fighting for earth".

Noise gates/suppressors certainly can help, if it's an interference or gain issue. I used to run two with my Marshall. A BOSS NS-2 sat before my amp, with my boosts, EQ, compressor and OD pedals in its loop; this minimised noise coming into the amp in the first place. I then ran an ISP Decimator pedal in the effects loop, to reduce the worst of the amp's own hum when the gain was cranked. If you decide to go for noise gates of any kind, that's how I'd suggest you run 'em.
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Old 01-15-2013, 10:13 PM   #4
"funny" but "unmemorable"
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Join Date: Apr 2006
Location: West Coast USA
Make sure they're plugged into the same outlet/powerstrip (so they share the same ground).

If that doesn't work you do need an isolation transformer for one of them. I know they make a handy pedal that does this (you plug your guitar in and it has 2 isolated buffered outputs) but I can't find it right now.

edit: here it is: http://www.tonebone.com/re-bigshot-aby.htm
Originally Posted by emad
Warned for trolling!


Last edited by jthm_guitarist : 01-15-2013 at 10:16 PM.
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Old 01-17-2013, 07:14 PM   #5
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Thanks for the response guy, really appreciate it.
I think my current power supply has a bust transformer.
An isolation transformer sounds perfect! Thinking of breaking out one of these in the rig,

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