Sonifex RB-BL2 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)