im bridging my 4 channel amp so i was wondering if i still need the 4 channel rca cables or if i can use the 2 channel ones

 

I bridged my 4 channel, to run my front components, I'm using a 2 channel RCA, with two "Y" connectors/splitters at the amp side. So one RCA plug feeds signal from headunit, with the left/right of the Y connector going into one channel on the amp, and right side with the other.