I had already used my spl meter to estimate how big a difference there was between the Ultras and Phil 2s. It was about 2 or 3 clicks on my volume knob (the Phils being a bit less sensitive). I had the ability to switch between speaker A and B on my remote and then quickly increase or decrease the volume. When the other guys brought their sets over, I hooked up the Monoprice selector to speaker A, then we had the Phils, Empteks, and Gallos on that. But, we did not level match the EmpTeks or Gallos. So, we could set the selector on which of the three (Phil, Gallo, Emp) we wanted then use the remote to A/B with the SVS. If we wanted to A/B between 2 of the sets on the selector, one of us kneeled down and did the switching manually while the other guys listened.