Monitor output cable type

I have been using my KPA for a while and have a basic question that I can't seem to find a definitive answer for.

I have the two main XLR outputs going to FOH and monitor out to my DXR10. When playing solo and duo gigs, I have only monitor out to my DXR10.

My DXR10 is quite noisy. I replaced my DXR10 recently as the LED wasn't working (I know you can turn it off) and it let me down at a gig when it suddenly started to hum very loudly. Even with the new DXR10, it is much noisier when using the monitor out compared to main out XLR. It also picks up electrical noise such as pops when somebody plugs in gear, the coffee machine at the venue is being used, etc.

And to my basic question...

Do I use a regular guitar cable from monitor out on the KPA to channel two on the DXR10 or will I have better results with a different cable? Not sure if TRS or anything else would be better so any help would be greatly appreciated!

I use the same as you - input 2 and input level around the -8 setting. Anyone I know using DXR10s for FOH set the level to 0 (straight up) and adjust the volume via the input feed. If I set the DXR10 level that high, it is extremely noisy. I just wondered if using something like a TRS cable would provide shielding, although I am probably talking nonsense!

Thanks @paults. I did learn something quite important last night regarding noise. I have been putting my DXR10 on an Auralex GRAMMA and putting my KPA in front of it on the GRAMMA too. There were strange electrical swirling noises coming from my KPA last night. I moved the KPA away from the DXR10 and the noises stopped. Don't know why I didn't think of this simple solution before!