Aftermarket Head Unit wiring help

[eightsandaces]

I used to do some installations, I recall some amps were designed to take speaker level inputs. If that is the case with the Becker, you should be able to use the speaker outs on the JVC , unless the output numbers are crazy different. Can you trace back from the amp and verify the origin of the connections to the Becker H/U?

edit* stated more simply, if the only connections to speakers out of the Becker H/U are amplified then it would seem to indicate the under hood amp takes a pre amped signal.