Car computer volume control?
#1
NB: Rpi newbie, but experienced software developer.

I'm putting together a Raspbmc car computer. My goal is to have a full car stereo replacement on the cheap, complete with fm tuner, hd radio tuner, and hands-free bluetooth capability. I will not have the Rpi in addition to my car stereo; it will be in place of my car stereo.

I've got a working raspbmc-based rpi working fine so far (hooked up to my home a/v receiver via HDMI for testing), and I've got an HDMI splitter with separate audio (see http://www.amazon.com/gp/product/B00KHGK29Q) on the way. My plan is to run the RCA out of the splitter to a conventional car amplifier, which will drive my speakers, of course.

How will I control the volume? At home, I obviously use my A/V receiver's volume control. What will I use in the car?

Thanks,
Matthew
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#2
Answered my own question (with some help from crutchfield.com). Preamps like http://www.amazon.com/gp/product/B00EUF4YNK will do the job.
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