In reply to:

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Has anyone considered/started making a sucessor?

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Yes, and every one of them realised it would be nearly impossible to make anything other than a one-off at great personal expense. I don't think Sonic Blue would ever release the designs. Besides, unless you've some serious PCB/soldering/metal work/linux kernel hacking skills it's probably easier to build something based on an existing PC motherboard.

Selling the things is another problem, most people want something that doesn't require a PC to make use of it. You'd also have to have something that looks fancy, the number of people I have met who think my empeg is the ugliest car stereo they've ever seen is quite alarming. Once they find out what it's capable of, they change their minds. The problem is, when your stereo is one of a bunch on display at the car stereo dealer it's got to stick out as the one to get. The empeg in it's current form doesn't do that.

Good luck with your car stereo building...