Headunit question

[Wiseguy109 10+ year member]

I have a Sony CDX-MP30 headunit and I want to install a amp and sub, will I be able to do this because I don't think the headunit has a sub preamp?

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[helotaxi 5,000+ posts]

You don't need a sub preout to add a sub. If you have a preout of any kind, you can plug it into the amp powering the sub and it will work. Most amps have a built in crossover these days, and a crossover is usually all that separates a sub preout from a regular one. If the amp has one already, you don't need another.

If you don't have any preouts, and I'm pretty sure that you do, use a line-out convertor and proceed as above.