Sonifex RB-UL4 Quad Stereo Unbalanced to Balanced Converter

The RB‑UL4 provides high-performance unbalanced-to-balanced conversion across four stereo channels. Each input is received via phono (RCA) connectors and routed to balanced XLR outputs. Rear-panel gain controls allow independent left/right level adjustment per stereo pair, enabling accurate gain alignment from –15 dBu to +15 dBu relative to a –15 dBu input. This flexibility makes the RB‑UL4 ideal for situations where consumer devices need to interface with professional audio infrastructure.

Engineered for clean and transparent signal handling, the unit offers a wide bandwidth of 20 Hz–20 kHz (±0.1 dB), low distortion, and excellent signal-to-noise performance. Its robust design includes an IEC mains power inlet with voltage selector switch and built-in fuse protection. Housed in a compact 1 U chassis, the RB‑UL4 is well suited to both fixed installations and portable racks, offering reliable operation and straightforward integration.