Car Stereos: 1999pontiac grandprix, bose system, speaker wires

Question
my car has the bose system but no onstar iwant toput a pioneerin but there are four wires on the factory deck besides the main one what are these wires what do i do

Answer
Hi Tony,

The Bose system in your car likely uses a 'common ground' for its speakers, and carries the speaker signal on wires that look like regular amplified speaker wires, but are actually pre-amps.  You'll need a product like:

http://www.crutchfield.com/App/Product/Item/Main.aspx?i=127OEM2

to be able to hook your aftermarket deck up to the factory amplifiers.

Justin