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[legacyboy 10+ year member]

how do you hook up a subwoofer amp to a head unit that only has front and rear prempouts

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[creater 10+ year member]

u hook it up to the rear pre out

 

[Jdizzle 10+ year member]

duh duh duhhhhhhhhh

 

[Prowler573 5,000+ posts]

how do you hook up a subwoofer amp to a head unit that only has front and rear prempouts

Some HUs with only two sets of preouts have an option where the rear set is switchable to a subwoofer out.

If this isn't the case with yours then you'll still want to hook your sub amp to the rear preout and (assuming your HU is lacking internal crossovers) you'll need to use either the LP crossover in the amp itself, if so equipped, or an outboard crossover so you're not sending a full-range signal to your subs.