JVC KD-SX990 no preamp audio

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i have hooked up my jvc kd-sx990 headunit to my car. i get audio out
of the amplified speaker wires coming off of the head unit but when i
hook up my 4 rca pre amp outs to the head unit i get no audio
whatsoever. the 4 rca's then go back to my sony amp in the trunk.
everything is fine with the amp because it was working with my other
head unit (and still does if i switch out and put my other head unit
on). but i want to use the jvc kd-sx990, do i have to tell the head
unit to send the audio out over the 4 rca's rather than the speaker
wires?

[BigBob]

http://www.jvc.ca/en/consumer/downloadmanual.asp?f=49781ien.pdf

I believe that you will have to "to tell the head unit to send the audio out
over the 4 rca's rather than the speaker wires"
But I can't find the right page in the manual to say how to do it.

> wrote in message
oups.com...
>i have hooked up my jvc kd-sx990 headunit to my car. i get audio out
> of the amplified speaker wires coming off of the head unit but when i
> hook up my 4 rca pre amp outs to the head unit i get no audio
> whatsoever. the 4 rca's then go back to my sony amp in the trunk.
> everything is fine with the amp because it was working with my other
> head unit (and still does if i switch out and put my other head unit
> on). but i want to use the jvc kd-sx990, do i have to tell the head
> unit to send the audio out over the 4 rca's rather than the speaker
> wires?
>