Gotham
Audio

RB-BL4 Dual Stereo Bi-Directional Matching Amplifier


RB-BL4 Dual Stereo Bi-Directional Matching Amplifier

A/D Audio specification
Maximum Input Level

+28 dBu
Maximum Output Level +28 dBu
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 out -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, 110-120V, or 220-240V, fused, 6W max.

Audio Interfaces - Redbox - Matching Converters

 

RB-BL4
RB-BL4 ISO
RB-BL4 FRONT
RB-BL4 REAR
Iso View
Front View
Rear View

RM-RK3 logo  RM-FR1 logo

The RB-BL4 Dual Stereo Bi-Directional Matching Converter.

RB-BL4 Dual Stereo Bi-Directional Matching Converter

The 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.

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.

RB-BL4 Diagram

RB-BL4 Block Diagram.

See larger image >

Technical Specification For RB-BL4

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)
   

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