Yes there is a couple possible ways. 1. Get 2 RCA Y adapters and split your Preamp Output you will not have any type of fader control this way because you are using a single output.
2. Run one amp from the radio with a set of RCA Cables. Hook up amp #2 using a Line converter connected to the output of your stereo which will convert you to RCA the just run a cable to the amp..
3. If one of the amps has a High Level Input Run a set of speaker wires from the stereo outputs to the High level Input. I personally prefer the above 2 methods I find Low Level input sounds better.
Answers & Comments
Yes there is a couple possible ways.
1. Get 2 RCA Y adapters and split your Preamp Output you will not have any type of fader control this way because you are using a single output.
2. Run one amp from the radio with a set of RCA Cables.
Hook up amp #2 using a Line converter connected to the output of your stereo which will convert you to RCA the just run a cable to the amp..
3. If one of the amps has a High Level Input Run a set of speaker wires from the stereo outputs to the High level Input.
I personally prefer the above 2 methods I find Low Level input sounds better.
Hope this gives you some Ideas and helps