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[Paul G. OBrien]

According to the owners manual the 1/4 inputs are TS unbalanced.

No that's not correct they are TRS balanced.. these two connectors are just wired in parallel with each other. So the OP just needs a couple short TRS to TRS (3 conductor) cables commonly referred to as a stereo or balanced patch or a TRS to XLR-male cable.

[Tim McCulloch]

According to the owners manual the 1/4 inputs are TS unbalanced. 

The ground Loop problem can be fixed using the Behringer hd400 or the better hum blocker  ebtech   hum eliminator 

https://www.amazon.com/Ebtech-HE-2-XLR-Eliminator-2-Channel-Jacks/dp/B00101WA4C/ref=sr_1_2?ie=UTF8&qid=1474895853&sr=8-2&keywords=ebtech+hum

On some amps there is a switch for the ground lift.  Because these amps do not have the ground lift on the inputs you can not stop this with the XLR Y cable.  You will have to use something like the ebtech to fix the ground problem.

The manual clearly states the 1/4" connectors are TRS and a look at the block diagram shows this, too.

[Scott Olewiler]

No that's not correct they are TRS balanced.. these two connectors are just wired in parallel with each other. So the OP just needs a couple short TRS to TRS (3 conductor) cables commonly referred to as a stereo or balanced patch or a TRS to XLR-male cable.

So Buy this:

https://www.amazon.com/GLS-Audio-Patch-Cable-Cords/dp/B000SKUBAG/ref=sr_1_41?ie=UTF8&qid=1474908756&sr=8-41&keywords=1%2F4%22+TRS+To+1%2F4%22+TRS&refinements=p_89%3AGLS+Audio

or this:

https://www.amazon.com/GLS-Audio-Patch-Cable-Cords/dp/B000SKS2NY/ref=sr_1_7?ie=UTF8&qid=1474908882&sr=8-7&keywords=1%2F4%22+TRS+To+1%2F4%22+TRS&refinements=p_89%3AWhirlwind%7CGLS+Audio

[David Allred]

According to the owners manual the 1/4 inputs are TS unbalanced. 


 

From the spec sheet.

I/O Connectors

Line input / output ports
2x XLR-3-31, 2x 1/4"TRS phone jack

[Steve M Smith]

The ground Loop problem can be fixed using the Behringer hd400 or the better hum blocker  ebtech   hum eliminator

Or by just removing the ground loop.  Use a TRS to TRS lead with the shield connected at one end only.




Steve.

[JonDunlap]

Thanks for all the replies and help. Today I bought 2 XLR splitters and the buzz is gone. However, the buzz is present when you turn on the amps, but I soon as a fire up the mixer it goes away. Is this normal?

[Will Padgett]

Thanks for all the replies and help. Today I bought 2 XLR splitters and the buzz is gone. However, the buzz is present when you turn on the amps, but I soon as a fire up the mixer it goes away. Is this normal?

Best practice is to power on the amps last, so your speakers don't get damaged by the signal spikes created from other equipment. The buzz is due to poor grounding scheme. Once your mixer is on the noise is given a clean path to ground. Always be cautious when lifting grounds.

Will

[JonDunlap]

When you say poor grounding scheme are you referring to the electrical service of the venue?

[Jean-Pierre Coetzee]

When you say poor grounding scheme are you referring to the electrical service of the venue?

If the buzz goes away when the desk is on there is no problem. Just follow the startup procedure that Will recommended. Turn on the desk first and then the amps(make sure all the inputs on the desk are muted before you turn on any instruments or plug any cable in/out while your busy learning things)

[Will Padgett]

When you say poor grounding scheme are you referring to the electrical service of the venue?

Yes I am talking about the venues electrical service.  There's a good article in the study hall about electrical grounds, link below.  Jean-Pierre is correct that if the buzz goes away I wouldn't be to concerned.  By the way when turning off your system turn your amps off first.
http://www.prosoundweb.com/article/shocking_situations/studyhall

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