Before i go n dump more money maybe yall can help me out anyways this is my setup..alpine hu,audiocontrol preamp,two jl 500/1 amps feeding each 10 w7s in a ported box,running 4gauge streetwires from battery to a 150anl fuse down to a distubution block with two 60agu fuse to each amps with 4gauge as well,ground are also 4gauge to a distubution block n 4 gauge out to each amps,big3 upgrade with 4gauge on stock alt n battery.,gains on the amps are lil over half and all connection are tight..my problem is when i turn the volume up and the bass hit it will cut out then comes back on but if i play it at low volume it is fine also when its cutting out i look at the lights on both amps n it stay green no blink or off and if i unplug one sub itll play as loud as i want just cutting when both subs are hookup.two guys from diffrent shop say i need 0gauge are they telling the truth or just want me to buy their wires? Please let me know what i can do or did wrong cause im stuck..thks