In Car Entertainment & Security
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By PandaHatch
#143654 very good info here:
http://www.crutchfield.com/App/Tab/Learn.aspx
will give you diagrams and all kinds of usefull shit. :thumb:

This is a more specific spot for you to look at. pick one link and read.
http://www.crutchfield.com/App/Learn/Ar ... 42&tp=1053