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 with no sound coloring, thanks to the -96 to 0db balance potentiometer mode. Fully Distortion-Free: Maintain the integrity of your audio with our amplifier's distortion-free design. The 0db setting ensures that the input signal remains in its original state, allowing you to switch between 4 channel inputs without any distortion. 0-31.5dB Preamp Mode: Enhance your audio experience with the preamp mode, which automatically activates the amplifier circuit at more than 0db. Achieve up to 10 times amplification with a maximum of 31.5db, making it perfect for connecting directly to a post amplifier for pre-stage use. STC High-Speed Master Control CPU: Our 4 in 1 out switch amplifier features an STC high-speed main control CPU, ensuring that input channels and volume data are saved instantly. Benefit from the convenient memory function that restarts seamlessly. Independent ST Regulator: The multi-channel input stereo amplifier is equipped with an onboard 3-way independent ST regulator. This design provides independent isolation to eliminate interference and crosstalk noise, ensuring a clean and clear audio output.