Hi there, I want to make a strange amp/project… but I need some information which I don’t find easily. Thinking at the idea I have into my mind, it will be very small and the problem is the space behind the woofer, how many centimeters should I leave if I "close" the amp, like some small ones (for example Blackstar id core stereo 20, which I own one)? And how many centimeters should I leave behind it if I put a grate? I probably use woofer with 10 cm of diameter. I know that it won't sound as good as a real amp and to make one you need to know lots of technical things... but I want to try. Thank you.