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Lots of other stuff, but in short creating stuff that demolish store bought equivalents by a huge margin. Latest was a sub built with Sundown driver. Built it by ordinary enclosure calculators and tested the enclosure with WinIsd. That port is 3" in diameter and 28" inches long. You just look at it and know its gonna rule.
After installation went to a Halfords branch and said I wanted to uprade my sub, with 2 of their guys to suggest the best upgrade, spent 3 hours testing their best and most expensive subs. Had my own decibel meter and test tracks consisting of 30 and 40 Hz tones. Their subs never stood a chance, while costing 4-5 times more than what I spent on mine. Unfortunately havent got the artsy pics on the phone, maybe later. My other stuff was an overpowered quadcopter made to be the fastest at my field, two flashlights with absolutely ridiculous outputs, of which one is UV, two CO2 guns Jericho 941 and Crosman 2240 that exceeded 850 fps, and other stuff like that.