To start with thank you all, for any info you all can give. I am trying to find a free downloadable pdf schematic, for my MEI DA4450 600W 4 channel amp. I have done a complete search with lots of detail, and less detail when required. My results have been fruitless, the reason I need the schematic is I have lost the left side sound from my amp and I wish to repair it. I am not sure if the problem is on the input side or the out put side. So in short if anyone knows or has the schematic, please share info. And again thanks for any help........