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<blockquote data-quote="Mitchell Fosgate III" data-source="post: 8897931" data-attributes="member: 691623">Is that PAC like some kind of module? It’s a switching device.&nbsp; It switches signals between devices.&nbsp; Used in engineering purpose.&nbsp; The TR7 PAC is one of them.&nbsp; I’ll have to check again.&nbsp; But, the signals are not switched.&nbsp; And the factory head unit was kept.&nbsp; How much watts to the amp and how much watts to the loud speakers? It should be matched at 4 ohms.&nbsp; Otherwise at 2 ohms, the power looks like it’s doubled the power.&nbsp; Even though it’s not.&nbsp; One amplifier? Mono amp was used then.&nbsp; Did you take the specs into account first?

Okay, I saw the wiring harness and module that comes with it. $179 dollars from crutchfield.&nbsp; So just the amps and the loud speakers.&nbsp; It should be at 4 ohms.&nbsp; The factory door speakers may be lower than 4 ohms.&nbsp; Chevrolet makes or uses their own OEM module?&nbsp; Ford used Sony.&nbsp; You used GM.&nbsp; So not sure if that was the correct module to use on a Chevy.&nbsp; If in all likelihood your Chevrolet doesn’t have steering wheel controls, the module is not needed anyway.&nbsp; So take it out.&nbsp; LOC may be needed.&nbsp;&nbsp; There is a factory amp? One more harness to add.&nbsp; The signal wires from the factory amp connect to the speakers wires input of the power amp.&nbsp; + wires.&nbsp; Signal wires are the red, yellow, black, blue, blue-white, …</blockquote>

[QUOTE="Mitchell Fosgate III, post: 8897931, member: 691623"] [JUSTIFY]Is that PAC like some kind of module? It’s a switching device. It switches signals between devices. Used in engineering purpose. The TR7 PAC is one of them. I’ll have to check again. But, the signals are not switched. And the factory head unit was kept. How much watts to the amp and how much watts to the loud speakers? It should be matched at 4 ohms. Otherwise at 2 ohms, the power looks like it’s doubled the power. Even though it’s not. One amplifier? Mono amp was used then. Did you take the specs into account first? Okay, I saw the wiring harness and module that comes with it. $179 dollars from crutchfield. So just the amps and the loud speakers. It should be at 4 ohms. The factory door speakers may be lower than 4 ohms. Chevrolet makes or uses their own OEM module? Ford used Sony. You used GM. So not sure if that was the correct module to use on a Chevy. If in all likelihood your Chevrolet doesn’t have steering wheel controls, the module is not needed anyway. So take it out. LOC may be needed. There is a factory amp? One more harness to add. The signal wires from the factory amp connect to the speakers wires input of the power amp. + wires. Signal wires are the red, yellow, black, blue, blue-white, …[/JUSTIFY] [/QUOTE]

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