Will - When I increase and decrease the trim or calib, the hiss raises and lowers (in analog) At -15db in the trim or calib menu, it is REAL quiet, as quiet as it is in digital mode. The hiss is also volume control dependent. It seems to stay the same after I exit the menus. Since I thankfully don't have to run the trims above 0db, the hiss in my unit is acceptable, but not stellar. Generally, the hiss is only audible about 5 feet from the horns. I sit at 15 feet from the speakers. I have some analog preamps that are certainly quieter, even a couple that use vacuum tubes.