I have had no issues when I owned a 350, 500, or now 600. Many times people have their receiver dB level set to low, so the voltage is not telling the sub to stay awake. I would call Axiom if you want an accurate answer.

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