Sc 430 Audio Problems

[247jones]

i replaced all my factory speakers with after market speakers 6X9 ma audio in front 4" ma audio in side pack panels and 8" sub with jl audio

It sounds great but when i turn up the volume too much it will cut off and then cut back on you will have to turn the volume down and it will be ok

Is there any thing i can do about that cutting on and off

Also i left my factory lexus radio installed i really want to keep it installed