System and Amp installation help

[nattheman]

I have 2 amps one sony 4 channel amp to power the 4 speakers and a monoblock memphis amp to power my 2 subs.

I have a new sony stereo that has outputs that say front, rear, bus in. My question is how would i connect the rca cables to the sub amp, and to the 4 channel amp. I need 3 rca cables correct? Since i need one to go to the sub amp for the signal, one for the rear speakers and one for the front. But how can i do this if my brand new stereo says only front and rear. I dont want to split the rca cables since I dont want to lose power. But how would I get the signal to the rear speakers? I am very confused. Any help would be greatly appreciated. Thank you!

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[PJK485 10+ year member]

What model sony is it? Did you check to see if there is a black rca labeled "sub" pigtailed out of the back of the radio?