Need advice replacing my preamp

What about the Benckmark preamp? 

I was running 12 Meters of  Mogami XLR Cables from Atma-Sphere MP-1 to the mono-blocks. could not tell that between the Purist audio XLR Neptune which cost thousand of dollars.

However the above system was from Atma-Preamps to Atma-Poweramps.

When i tested Atma-Pre-amp to a SET amplifier Cables made a diffrent. So i dont know how this works on the AES ralph talks about but it seems other manufacture XLR balanced connection don't really seem fully balanced????

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!