My first issue is the requirement of a good knowledge of complex numbers. After an hour or so on YouTube I've come to realise that I must not have been in that day at school 20-odd years ago

So basically I'm looking for a good way of getting my head around this conundrum. I know if I persevere I'll get it eventually, but it would be good to find something that explains it all in a way that suits me.
But not just complex numbers. Any general content to do with room acoustics, electronics in music, microphone design...anything geeky like that. I know Google is my friend and all that, but specific recommendations are always good.