TOPPING Pre900 Fully Balanced Preamplifier, True Differential Design, Relay Volume Control (0.1 dB Steps), Ultra-Low Noise Floor <0.3µVrms, 151dB DNR, XLR/TRS Inputs, Hi-End Audio Preamp

【True Fully Balanced Architecture】 Features a four-channel reference-grade design with end-to-end differential signal processing, ensuring ultra-pure signal transmission with maximum channel isolation and minimal interference. 【Independent Digital & Analog Power Supplies】 Separate power systems effectively eliminate internal crosstalk, maintaining a black background even under high dynamic range playback for exceptional clarity and detail retrieval. 【Ultra-Precision 0.1 dB Relay Volume Control】 High-precision resistor network with relay switching enables 1,000-step volume adjustment, maintaining perfect channel balance and consistent tonal character at every level. 【Flagship-Level Performance Metrics】 Delivers industry-leading 151dB DNR/SNR, ultra-low THD <0.00003% (20–20kHz), and transparent signal amplification that preserves original source integrity without coloration. 【Massive Dynamic Headroom -69 Vpp Output Swing】 High gain design up to 19.9 dB ensures effortless handling of transient peaks without clipping, delivering powerful, controlled, and highly dynamic audio performance. 【Multiple Professional Input Options】 Equipped with three sets of XLR/TRS balanced combo inputs using Neutrik connectors, offering robust compatibility and stable connections for professional audio systems. 【Safe Volume Protection System】 Built-in safe volume mode automatically limits output level on startup or input switching, preventing sudden loud bursts and protecting hearing and connected equipment. 【Flagship System Integration & Control】 Designed for seamless pairing with high-end setups, featuring a single XLR output stage, 12V trigger in/out for system sync, 2.0-inch color display, and aluminum CNC remote control.