HL-404A Bidirec onal 3.5mm Stereo Audio Fiber Extender

High-Density Simultaneous Two-Way Stereo Transport The HL-404A Bidirectional 3.5mm Stereo Audio Fiber Extender is a high-density, professional fiber optic transport system engineered for high-performance, two-way audio networking across extensive distances . The device accommodates 4 independent stereo pairs—totaling 8 mono channels—traveling concurrently in both directions simultaneously with zero signal degradation . Designed with an unbalanced, stereo single-ended input configuration, it features standard 3.5mm stereo jacks for quick, robust physical connectivity . This high-density bidirectional infrastructure makes it highly effective for complex applications, including high-density bidirectional multimedia education and intercoms, remote multi-channel audio feedback for large-scale events, stadium and campus-wide professional audio networking, and commercial interconnects with multiple return audio paths . Advanced FPGA Digital Processing and High Fidelity At the technical core of the HL-404A Bidirectional 3.5mm Stereo Audio Fiber Extender is an innovative processing engine built on high-integration FPGA digital encoding/decoding and clock recovery technology . This advanced architecture actively eliminates signal jitter, ensuring maximum timing and signal stability . Delivering studio-grade performance characterised by high linearity, wide dynamic range, and an exceptionally low-distortion 997 Hz sine wave output, the device generates up to a 24-bit resolution serial output stream . For flexible system integration, it maintains native protocol compatibility with professional I2S bus and MSB formats, and it supports a 48 kHz basic sampling rate alongside a 96 kHz high-rate audio processing mode . Universal Fiber Optimization and Zero-Configuration Deployment The HL-404A Bidirectional 3.5mm Stereo Audio Fiber Extender delivers universal optical flexibility, operating seamlessly over both single-mode and multi-mode fiber infrastructures via standard FC optical connectors, with optional support for LC or ST types . The system achieves an un-relayed transmission distance of up to 1 KM over multi-mode configurations and a standard default range of 20 KM over single-mode networks, with custom long-haul scaling options available up to 100 KM . This entirely hardware-based solution is purely plug-and-play, demanding zero software configuration, manual calibration, or technical adjustment . Used in matched transmitter and receiver pairs, the desktop and rackmount-ready hardware features high-visibility panel LEDs for real-time monitoring of device power, fiber link connectivity, and active audio status . Download the technical specification sheet here - LINK