Standard HiFi Output: Experience pure sound with our HiFi amplifier, which supports precise volume adjustment and delivers a standard HiFi output. Enjoy full lossless audio without any sound coloring, thanks to the -96 to 0db balance potentiometer mode that ensures clarity and fidelity in every note. Fully Distortion-Free: Maintain the integrity of your audio with our amplifier's 0db switch mode, which keeps the volume at zero for the original state of the input signal. This feature allows you to switch between four channel input signals without any distortion, preserving the purity of your music. 0-31.5dB Preamp Mode: Automatically activate the amplifier circuit when the volume exceeds 0db. Achieve up to 31.5db for a tenfold amplification, making it ideal for direct connection to a post amplifier for pre-stage use. This flexibility allows you to customize your audio setup to suit your needs. STC High-Speed Master Control CPU: Our 4 in 1 out switch amplifier is equipped with an STC high-speed main control CPU, ensuring that input channels and volume data are saved instantly. The memory function allows for seamless restarts, providing a user-friendly experience and reliable performance. Independent ST Regulator: The multi-channel input stereo amplifier features an onboard 3-way independent ST regulator. This design provides independent isolation to eliminate interference and crosstalk noise, ensuring a clean and immersive audio experience.