The Luxman C-900u is a preamplifier designed to deliver high audio performance. It uses Luxman's ODNF (Only Distortion Negative Feedback) version 4.0, a feedback circuit aiming to maintain clarity by reducing distortion. It features a robust power supply and a high-quality build, ensuring stability and durability. Its control system allows users to delicately adjust the sound to their preferences, contributing to its precision and audio fidelity.