infinity system wiring question

[shadow1]

Why does the 2g Infinity headunit have both the standard receiver harness (power, illumination, 4 channel speakers) and a separate DIN cable going to the Infinity amp under the passenger seat????? I would think the DIN cable would cover the speaker output with subsequent speaker connections from the amp itself. Is this system redundantly wired? I noticed that Crutchfield sells their receivers with just the standard wiring harness. This makes me think that the factory amp is bypassed with their setup. I know their are aftermarket adapters that allow RCA connections from aftermarket headunits to the factory amp as well.

 

[Defiant]

Yeah. I don't know what the heck they're doing with the setup, but the dash tweeters are only powered out of the amp, too. If you're not running the amp, the door and rear speakers come straight out of the radio, using only the plug in the main harness, and the tweets aren't used. Aftermarket units don't bother with the factory amp at all, and you're right, it is bypassed- you probably don't use the DIN cable to it.