My Pioneer MCACC eq is always on the setting that (supposedly) optimizes frequency response. However, I tune to ear the volumes and crossover settings of my 3 subwoofers, turning them down until I stop hearing low frequency booms.

Greg
VP180, M80s, M22s, QS8(4), CSW S305s, EP500, Pioneer VSX-90
M2i, M3(2), Pio vsx-1020