wiring id an Alpine cassette unit - no ground?

[Goldenvoice]

The bowlplunkt in the ole' Benz took a dump, and I have an old Alpine 7162 dual-shaft cassette unit sitting here...

The question: the speaker wires are all marked (for the most part), and the red and yellow wires are no brainers. The only other wire is tan/brown, and is marked 'power amp'.

So, where's the ground? Do I just ground the frame?

? Joe

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