I’ve been searching for information for a long time but neither found in the web nor directly here in the forum. it’s high input level inputs of a Mac Audio Mac Attack 600 amplifier. after 2 moves I can’t find the DBA anymore. Now I’ve changed the car and would like to use this from BMW original radio. As this doesn’t have a low level out I want to use the high level input of my end stage. The amplifier has 6 ch. each for low and high input. For high input there are 3 books I can’t see which pin + and which one is. I’ve already written to Mac Audio but they can’t help me, because it’s an older end stage that won’t be supported after taking over the company… Now I’m standing on the hose. Maybe someone has a similar end stage, e.g. Mac Attac 200 or 400, or just know how the pins can be used. I have opened the case to see if there is a name on the board but unfortunately only ch1+2 … 🙁 Thank you for any information in advance. Rob. PS. the sockets look like this from the ° ° ° ° , so with 4pins each. I have seen with a newer power stage name like: +–+ but again with other +-+- now I don’t want to break anything and just connect to pi-mal-daumen. PPS. Can unfortunately not take a photo today… if I want to do it tomorrow and 😉