Interesting that you wired it directly to the oem wiring. Did you wire the speaker output wires from the Dynavin also? It looks like you used RCA cables from your install, but I was wondering what you did with the speaker output wires (e.g. the white/black, grey/black, purple/black, etc. wires for the speaker line outs...NOT the RCA output)

I was looking at the wiring diagram on top of the Dynavin head unit, and I have a crazy theory if these are interfering with sound somehow (since the Dynavin was originally intended for non DSP setup, so the audio output would have been run with these wires instead of going through the hassle of the RCA outputs)