Quick backstory: I was expecting to have a big subwoofer build thread by right now, but that project is mostly put on hold for a couple of months. It's pretty close to complete, but this project got ...

I've got a new flat with a large, high-ceilinged and somewhat echo-y living space. It's about 10 meters (30 feet) long and maybe 6 meters (18-20 feet) wide. I have two rafters running across the space ...