That is what I'm experiencing, my 600 is all the way off, and I have to put my receiver at like -6to7dB's to bet it showing 75dB or so on the meter. The problem is that I have to really crank up the gain on the 350's because the receiver is so low.

Then when I turn them all on, my SPL goes through the roof. I would think you would want 75dB's with them all running, which will be impossible with the 600 the way it is.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85