All HU in the market used unbalanced outputs.

You probably mean balanced outputs instead?

These outputs are really rare on a deck but I know two that have them.

1- Eclipse CD8053 (this is my current deck, simply awesome SQ unit) can provide up to 16 volts balanced and 8 volts unbalanced of output.

2- Rockford Fosgate 8250 (AKA Denonford because they are made by Denon) can provide up to 8 volts balanced and 5 volts unbalanced of output.

The only problem is that these deck are now discontinued and been replaced by unbalanced version.

The only way to get one is on the used market (buy the way, psx2000 had a 8250 for sale a couple days ago. Maybe he still have it?).

I tried my deck with both configuration. The balanced technology provided an extremely high level of noise rejection. But in all honesty, my deck is now running unbalanced at 8 volts and wired to JL Audio amps and I am now experimenting the exact noise free environment than with the balanced configuration. The sound is absolutely free of any unwanted noise.

My guess is on any good installation with proper gain setting, noise should not be a factor. Even you use balanced, unbalanced, 16, 8 or 4 volts.

lappy