Sonifex RB-BL4 | Dual Stereo Bi-Directional Matching Converter

The 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.

Product Features

• Pre-set left and right gain controls
• 2x Stereo phono (10kΩ) inputs.
• 2x Stereo phono <50Ω outputs.
• 2x Stereo balanced Neutrik XLR 20kΩ inputs.
• 2x Stereo balanced Neutrik XLR <50Ω outputs.

Typical Applications

Providing bi-directional matching conversion between an unbalanced and balanced piece of equipment, typically between an unbalanced portable recorder & balanced USB or flashcard playback device.

Product Category

Signal Converters

Technical 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
• Gain Range: 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)
• Fuse Rating: Anti-surge fuse 250mA 20 x 5mm (115VAC)

Equipment Type

• RB-BL4: Dual stereo bi-directional matching converter

Physical Specification

• Dimensions (Raw): 48cm (W) x 10.8cm (D) x 4.2cm (H) (1U)
• Dimensions (Raw): 19” (W) x 4.3” (D) x 1.7” (H) (1U)
• Dimensions (Boxed): 58.5cm (W) x 22.5cm (D) x 7cm (H)
• Dimensions (Boxed): 23” (W) x 8.9” (D) x 2.8” (H)
• Weight: Nett: 1.3kg Gross: 1.9kg
• Weight: Nett: 2.9lbs Gross: 4.2lbs

Support and Downloads

Handbooks & Guides

• RB-BL4 Handbook

Brochures

• Click to visit the brochures page.

Declarations

• Click to visit the declarations page.

Related Products

• RB-ADDA Combined A/D and D/A Converter
• RB-ADDA2 Combined A/D and D/A Converter
• RB-BL2 Unbalanced to Balanced Bi-Directional Converter
• RB-DAC1 Digital to Analogue Converter
• RB-FR1 Front Panel Kits for Redboxes
• RB-LU4 Quad Stereo Balanced to Unbalanced Converter
• RB-RK3 Rear Panel Mounting
• RB-SC2 Dual Sample Rate Converter

Official Links

• Official Product Page