noise in my system

By: SCStreetRacer

i just finished wiring my dad's car (95 SHO) with a separate amp for speakers, and subwoofer......for the speakers i used a Boss Riot 1000W peak (100x4 RMS) amp....i used the factory wiring that went from the factory amp in the back. and i used a sony 400W for his JL 8in........is sounded great until i started the engine. I heard a buzz/hum/high pitched annoying ass sound that gets higher and lower with engine speed. I rechecked all of my grounds.....sanded the points and changed locations......but it's still there......i even pulled out the HU and grounded that again........I used a 4gauge from the battery and used a splitter to 2 8gauge wires to power each amp.....also i used 8 gauge wire to ground....i just don't get it.......what could be the problem?

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