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h3 Contributor - Level 1
Contributor - Level 1

XR18 channel hum when instrument plugged in

On my new XR18 I get a channel input level visible when I plug an intrument in which increases when the gain is turned up and produces a low hum audiable through the speakers on live use. This is when the intrument isnt being played. This doesnt happen when a mic is plugged into a channel. This happens on all channels.. Hi-Z or not. Have done a firmware update but with no effect. Has anyone had this problem? 

h3 Contributor - Level 1 3 weeks ago

3 weeks ago

XR18 channel hum when instrument plugged in

On my new XR18 I get a channel input level visible when I plug an intrument in which increases when the gain is turned up and produces a low hum audiable through the speakers on live use. This is when the intrument isnt being played. This doesnt happen when a mic is plugged into a channel. This happens on all channels.. Hi-Z or not. Have done a firmware update but with no effect. Has anyone had this problem? 

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Trusted Contributor - Level 3

Re: XR18 channel hum when instrument plugged in

@h3  Hi.

What kind of instrument? 

If it's a powered instrument (like a keyboard), it could be a ground loop. Try plugging into the same outlet as the mixer.

If it's an like an electric guitar, it could be hum induced by lights, neon signs, computers, etc. Try moving to a different spot or try another instrument.

 

h3 Contributor - Level 1
Contributor - Level 1

Re: XR18 channel hum when instrument plugged in

Hi Dave. Thanks for the reply. Have tried two different acoustic guitars and an electric bass. Tried different instrument cables also and its the same result either through PA speakes or headphones. Chris..

Trusted Contributor - Level 3

Re: XR18 channel hum when instrument plugged in

@h3 Hmm??  When you plug them into a different amp/mixer in the same location, are you getting any hum?

If you turn on the Low Cut filter for that channel (set at about 120 Hz), how much hum does that reduce?

The big question is: Is it the mixer? or something else?