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The KTP-445 is a unique product that connects to any 2008 Alpine head unit. Its narrow size and slim width allows it to fit behind the head unit in the dash cavity of most vehicles. The KTP-445 connects in-line with the head unit’s power harness without the need for additional wiring or special tuning. A high/low gain switch allows the Head Unit Power Pack to work with any Alpine head unit with a black wiring harness right out of the box yet it also has a built-in selectable HP crossover for system expansion.