Sonifex RB-BL2 Unbalanced to Balanced Bi-Directional Converter

The RB-BL2 is a bi-directional stereo unit for interfacing domestic, or semi-pro unbalanced equipment to professional balanced line levels, and vice-versa.

All connections are on the rear panel. The two XLR-3 electronically balanced inputs have an impedance of 20k ohms bridging and are routed to two unbalanced RCA (phono) outputs with an output impedance of <50 ohms.

The two RCA unbalanced inputs have an impedance of 10k ohms and are routed to two balanced XLR-3 outputs with an output impedance of <50 ohms.

The output gain can be individually adjusted for left and right channels by using pre-set potentiometers accessible through the rear panel.

Audio Specification
Maximum Input Level	+28dBu
Maximum Output Level	+28dBu
Input Impedance (RCA)	>10kohms unbalanced
Input Impedance (XLR)	>20kohms balanced bridging
Output Impedance (RCA)	<50ohms
Output Impedance (XLR)	<50ohms
Distortion	0.01% THD @ 1kHz, ref +8dBu output
Noise	-100dB, unity gain, ref +8dBu output
Common Mode Rejection	>66dB typically
Frequency Response	20Hz to 20kHz +/- 0.1dB (600 ohm load, ref 1kHz)
Gain Range	Unbalanced output: -28dBu to +15dBu, ref -15dBu into balanced XLR input
Gain Range	Balanced output: -15dBu to +15dBu, ref -15dBu into unbalanced RCA input
Connections
Audio Inputs	2 x XLR 3 pin female (balanced), 2 x RCA phono (unbalanced)
Audio Outputs	2 x XLR 3 pin male (balanced), 2 x RCA phono (unbalanced)
Mains Input	Filtered IEC, switchable 110-120V, or 220-240V, fused, 6W max
Physical Specification
Weight	Nett: 1.0kg Gross: 1.4kg
Dimensions	Raw: 28cm (W) x 10.8cm (D) x 4.2cm (H) Boxed: 36cm (W) x 20.5cm (D) x 6cm (H)

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