The PSP is a premium analog preamplifier built for audiophiles who demand pure, noise-free sound. Fully isolated from digital circuitry, it features an all-analog volume control with optical separation from power sources to eliminate interference. Using LDR (light-dependent resistor) technology, it achieves precise, lossless volume adjustment via LED-controlled resistance. It offers channel balance, relay-free input switching, ramped mute, and a clear OLED display for an intuitive yet refined user experience. Powered by an “S” Rate Li-Po battery to reduce noise, and with swappable OPAMPs for easy tone tuning, the PSP delivers uncompromised analog clarity and detail.