My 350's are calibrated to the rest of my speakers, around 75dB using the receivers test noise. I've played very very low subwoofer test tones from youtube at very loud levels, clear, low, and no pop.

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