Do I need a preamp for Joying head unit?

[chrismonsteve]

I installed a Joying head unit recently on my Nissan Altima with Bose option. It works great, but I chose to wire the pre-amp outs (RCA connectors) to the OEM Bose amp that sits in the trunk. There is too much hiss and not enough amplitude, as I presume that the preamp outs don't supply enough amplitude to properly drive that amp. I tried wiring the speaker outputs to the amp inputs, but they supply too *much* amplitude. Is there an inexpensive, 12V preamp out there that will boost the preamp outs to a level that the OEM amp likes? I like the OEM amp, and it drives six speakers, so I'd rather not wire around it.

Thanks!

Steven

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