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OEM amp expects a balanced differential input. This isn't going to sound good if you wire it directly.

What are you TRYING to do? Why?

Just replace the OEM HU?
 

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Really all the parts mentioned, minus the LOC, are pretty typical for replacing an OEM HU. It also helped that all parts were recommended by Crutchfield for completing the job. The parts were only for supporting background information, my problem is that I do not have good sound levels. With the volume all the way up the sound remains low, WAY lower from the OEM HU.
That's because you've put a LOC, which is a high-low converter, onto a set of low level lines. Integrating an aftermarket deck to the OEM amp and speakers is challenging, and frankly self-defeating to do. Why are you bothering?

At this point, get a real amp and do the job right.
 
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