I am running the same combo as you in my A20. Your horns are going into protection mode. Mine have done the same. My head unit is a kicker media center with blue tooth, no EQ. I have my 600.2 crossover at 80 hrtz and the gain is 50% and set to stereo. I turn my head unit up to 37 and my ipod volume is at about 75%. Horns were going into protection mode until I went from 75% gain down to 50% gain on the amp. I am also running 4 gauge power and ground wires. I know you said your tuned at 75% volume on your head unit but what is the volume of the actual music source, ipod,phone.....etc? Also, make sure the Frequency Range button is not pushed in.
Last edited by stevev210; 06-11-2016 at 9:37 PM.