Since we're talking about "double bass", I actually have a slightly useful/slightly waaaay obtuse question:

The 80 Hz crossover on the 5.1 analog inputs puts the crossed over material to the sub 180 deg out of phase wrt the mains, vs the digital crossover (DD, PCM).

What if, I specifically went full range with the 5.1 inputs, to specifically get double bass, which would *perhaps* enable a person to not have to keep swapping the phase back and forth on the sub? (In other words, *use* the double bass to beef up the out of phase material?)

I do have that EFT software, just haven't tried it yet. This would be an interesting experiment I think...