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I had a similar unit in the back of my '90 Mercury Grand Marquis. It was for powering the stock speakers because the factory head unit doesn't have any amplifiers inside it- it's just a preamp. The likelihood is that this amp has proprietary jumpers on it which make it function only with the stock head unit that the donor '93 Eldo had. It may have been a Bose system, in which case the amp would be designed for the bose head unit and speakers.

I woudln't bother with it, they generally are not very powerful- no more than your Alpine head unit. Your Alpine doesn't mind driving 4 speakers, that's what it was designed to do. It may even have MORE power than the Cadillac amp.

Hope this helps you.

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