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?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.