This is the back panel and a trial fit of the fused IEC socket, the RCA sockets and the label I made to help identify the inputs/outputs. I went for a traffic light system, Red for Tweeters normally at the top, Amber for Mids and Green for Bass normally at the bottom. These all have Left and Right channel variants which are indicated by Red and White RCA sockets/plugs as normal. I will colour code the leads and amp channel inputs, also the speaker outputs to make it all fairly idiot proof. I don't want to accidentally plug a channel with power and frequency tailored for a bass driver into a tweeter, not if I can help it, so the clearer the better.