I like using the "illumination wire" if I am going to be driving on the highway alot at night (like when I had to travel all over BC) -- the glare of a very bright deck will drive you batty at 3am. In the city it does not make a big difference as most streets are lit.

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12 Inches is useless..until you put it in the right sized box

Obcon..... the best slot you will ever have....