Sonifex Redbox RB-SM2 Dual Stereo to Mono Converter

Sonifex Redbox RB-SM2 Dual Stereo to Mono Converter

The RB-SM2 is a dual version of the RB-SM1, consisting of two independent converters which will produce two fully buffered and balanced mono line outputs from two stereo inputs.

All connections are on the rear panel. The XLR-3 inputs are electronically balanced with an impedance of 20kΩ bridging. These can be wired unbalanced to accept an output from domestic equipment.

The XLR-3 line outputs are electronically balanced with an output impedance of <50Ω. The outputs can be wired unbalanced by grounding the non-phase signal, allowing you to feed both balanced and unbalanced equipment. Output gain adjustment using pre-set potentiometers for both converters allows a normalised mono output from domestic stereo equipment. The potentiometers are accessible through the rear panel.

Audio Specification

Maximum Input Level: +28dBu Maximum Output Level: +28dBu Input Impedance: >20kΩ balanced bridging
Output Impedance: <50Ω balanced Frequency Response: 20Hz to 20kHz ±0.1dB (600Ω load, ref 1kHz) Gain Range: Adjust -8dB to +18dB gain, ref. 0dB input on L and R Common Mode Rejection: >66dB typically
Distortion: 0.01% THD @ 1kHz, ref +8dBu output
Noise: -100dB, unity gain, ref +8dBu output

Connections

Inputs: 4 x XLR 3 pin female (Balanced, can be unbalanced)
Outputs: 2 x XLR 3 pin male (Balanced, can be unbalanced)
Mains Input: Filtered IEC, switchable 110-120V, or 220-240V, fused, 6W max
Fuse Rating: Anti-surge fuse 100mA 20 x 5mm (230VAC)
Anti-surge fuse : 250mA 20 x 5mm (115VAC)