Sonifex RB-BL4 - Dual Stereo Bi-Directional Matching Converter (1U)

Sonifex RB-BL4

The Sonifex RB-BL4 is a dual bi-directional stereo unit for interfacing domestic or semi-pro unbalanced equipment to professional balanced line levels, and vice versa. The four XLR-3 electronically balanced inputs have an impedance of 20kΩ bridging and are routed to four unbalanced RCA (phono) outputs with an output impedance of <50Ω.

The four RCA unbalanced inputs have an impedance of 20kΩ and are routed to four balanced XLR-3 outputs with an output impedance of <50Ω. All connections are on the rear panel.

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

Sonifex RB-BL4 Specifications

Audio Specification

• Maximum Input Level: +28dBu
• Maximum Output Level: +28dBu
• Input Impedance (RCA): >10kΩ unbalanced
• Input Impedance (XLR): >20kΩ balanced bridging
• Output Impedance (RCA): <50Ω
• Output Impedance (XLR): <50Ω
• 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 (600Ω load, ref 1kHz)
• Gain Range: Unbalanced Output : -28dBu to 0dBu, ref 0dBu into balanced XLR input
• Balanced Output : -15dBu to +15dBu, ref -15dBu into unbalanced RCA input   

Connections

• Inputs: 4 x RCA phono (Unbal), 4 x XLR 3 pin female (Bal)
• Outputs: 4 x XLR 3 pin male (Bal), 4 x RCA phono (Unbal)
• 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)      

Physical Specification

• Dimensions:
  
  • 48cm (W) x 10.8cm (D) x 4.2cm (H) (1U)
  • 19” (W) x 4.3” (D) x 1.7” (H) (1U)
• Weight:
  
  • Nett: 1.3kg Gross: 1.9kg
  • Nett: 2.9lbs Gross: 4.2lbs