So, i just received my used pioneer premier deh-680mp from AJČ06 a few days ago. The HU was nicely packaged and arrived the day he said it would. In his for sale thread he mentioned the HU had alt whine but had fixed it by grounding the RCA's. When i recieved it the grounds were still on the RCA's and upon installation there was no whine whatsoever.
overal i am pleased with my purchase from AJČ06. GOOD SELLER!