Product type and configuration: This is a singlechannel power amplifier board. For stereo or dualchannel operation, two boards are required. Power and drive: Real power is 200W undistorted with up to 300W available, providing strong driving ability for large speakers. It is capable of pushing a 15inch loudspeaker with ample headroom and clean sound. Power supply and voltage range: Supports a dualsupply configuration with DC input from 20 to 90 V. The upgraded version features optimized circuit and components. For safety and reliability, it is recommended to stay at or below 90 V and do not exceed the voltage rating. Compatibility and performance: Designed to deliver clear, powerful output to large woofer systems. The board's performance is suited to applications that require substantial, distortion power into a single channel. Key benefits: power for demanding 15inch loudspeakers Clean, undistorted output with robust headroom Flexible voltage range with improved circuitry in the upgraded version Simple, compact singlechannel module that can be paired with another for stereo Use scenarios: Small to midsized live sound setups: power a single 15inch speaker in a mobile PA rig or DJ setup, delivering strong, reliable sound without distortion. Rehearsal rooms or practice spaces: provide ample power to drive a large bass/ fullrange cabinet for clear monitoring and rehearsal playback. Fixed installations: suitable for bars, cafes, or small performance venues where a compact, powerful mono amplifier is needed; two boards can be used to build a stereo system for broader coverage. Notes on installation and operation: This board is a mono amplifier module; for stereo systems, pair two boards. The upgraded version improves circuit and component quality; follow the 90 V maximum guideline to ensure safe operation.