I will have to check, I think it is from the amps, but not totally sure. The only time I hear it is when the room is dead quiet, and I put my ear way down by the sub...


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