Factory Radio in 99' 528i

Does anyone by chance know what Pre-out's the Factory radio has in a 1999 528i? Its the 10 speaker setup with Factory Amp and 6 disk CD changer.

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Thank you,

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Branden Nelsen
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ASK ON www.roadfly.org E39 or auto/video forums. The experts there can help.
Branden Nelsen wrote:

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