Compact CD2399 microphone amplifier and digital reverb board designed for KTV/Karaoke applications. This singlepiece module combines microphone amplification with digital reverb and delay effects to improve vocal clarity, presence, and ambience in small PA and karaoke systems. Dual power support and AC12V compatibility make it flexible for a range of setups. Key benefits Improve vocal performance: amplifies microphone signal while adding naturalsounding reverb and delay to give vocals depth and polish. Flexible power options: dual power design with AC12V compatibility adapts to different power sources commonly used in karaoke and DIY audio systems. Simple integration: board format designed to be added into existing microphone and audio chains for quick upgrades to sound quality. Main features and attributes Model/chip: CD2399 — digital processing designed for reverb and delay in vocal applications. Functionality: microphone preamplification combined with digital reverb and delay effects suitable for KTV and karaoke use. Power: Dual power support; compatible with AC12V power sources. Format: singleboard solution (1pc) intended for installation within audio equipment or DIY projects. Performance focus: enhances vocal presence and room ambience for clearer, more professionalsounding vocals. Typical applications Home and smallvenue karaoke: add reverb and delay to a microphone feed to make home karaoke sessions sound more immersive and lively. KTV and bar systems: upgrade or vocal processing chains in KTV cabins or small bars where compact, effectequipped mic preamps are needed. DIY audio projects and repairs: integrate into custom mic preamp builds, hobby mixers, or to an existing module that needs reverb/delay capability. Practical notes for users Intended as a boardlevel component for integration into audio devices or DIY enclosures. Designed to work as part of a microphone/amplifier/audio signal chain to provide both gain and digital effect processing. Use appropriate wiring and mounting practices for safe, reliable operation with AC12V power sources. Includes 1pc CD2399 dual power microphone amplifier digital reverb board for KTV/Karaoke with delay, AC12V compatible.