Need advice replacing my preamp

OK so I changed out the cables, no difference. I found a lighting dimmer that adds some buzz but still need to get rid of more noise.

Nice preamp.  Wireworld has nice shielded cables and of course they mix and match RCA/XLR to fit your situation.  Without  purchasing, you could explore with The Cable Co. for a rental fee.  I run the Wireworld Silver Eclipse 8 with RCA at the preamp side and XLR at the powered speaker side.

One should also consider a quality power conditioner.  Cheers

When i tested Atma-Pre-amp to a SET amplifier Cables made a diffrent.

Balanced and single-ended operation are mutually incompatible- its either one or the other. Single-ended systems are sensitive to the cable- that's always going to happen!

OK, so today I did play with the RCA and notice it is micro phonic. I guess I have to move to a balanced set up? or place my equipment rack on the wall between the speakers thereby shortening the cable to 1.5 meter.