$300 · HHB Circle 1 Subwoofer

12" Studio subwoofer. This has 5 crossovers built in so you can run it in a variety of configurations including as an LFE channel, a stereo system with crossover, or a studio 5.1 mixing setup. They were made by the high-end audio company Harbeth and sold under the HHB name. Harbeth still carries parts for these, although it's built like a tank. Some scratches etc. A great sounding sub, but overkill for my current small space. $300 obo