: Some hobbyists bypass the internal board entirely and use a high-quality Mean Well 48V supply
The standby LED on the subwoofer will not light up at all. This typically points to a failure on the AC input side of the board, such as a blown fuse, a dead bridge rectifier, or a failed primary switching transistor. hys3c210-cs power supply
The HYS3C210-CS is a specialized component, not commonly used as a generic, off-the-shelf power supply. Its design is tailored specifically to work with amplifier boards like the found in many Harman Kardon systems. : Some hobbyists bypass the internal board entirely