The BX5 series from M-Audio are active (powered) near-field studio monitors with a 5-inch woofer. They’re designed for music production, mixing and monitoring in small to medium studio environments.
The series includes several iterations: the original BX5, the BX5 D2, the BX5 D3 and also Carbon/Graphite variants.
They’re meant as a reference monitor: you plug in line-level audio and they amplify internally, so you don’t need a separate power amp. For example: the original BX5 was described as “a two-way, compact active monitor ... built around a one-inch silk-domed tweeter and a 5.25-inch polypropylene-cone bass/mid-range driver.”