Sonifex RB-BL4 Quick Start Guide

Redbox RB-BL4

August 2008

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AUDIO INTERFACES

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Redbox - Matching Converters

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.

MATCHING CONVERTERS

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.

Audio Specication For RB-BL4

Maximum +28dBu
Input Level:

Maximum +28dBu
Output Level:

Input >10kΩ unbalanced
Impedance (RCA):

Input >20kΩ balanced bridging
Impedance (XLR):

Output <50Ω
Impedance (RCA):

Output <50Ω
Impedance (XLR):

Distortion: 0.01% THD @ 1kHz, ref +8dBu output
Noise: -100dB, unity gain, ref +8dBu output
Common Mode >66dB typically

Rejection:
Frequency 20Hz to 20kHz ±0.1dB (600Ω load,

Response: 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 Specication

Dimensions 48cm (W ) x 10.8cm (D) x 4.2cm (H) (1U)
(Raw): 19” (W) x 4.3” (D) x 1.7” (H) (1U)

Dimensions 53cm (W ) x 20.5cm (D) x 6cm (H)
(Boxed) : 21” (W) x 8” (D) x 2.4” (H)

Weight: Nett: 1.3kg Gross: 1.9kg
Nett: 2.9lbs Gross: 4.2lbs

www.sonifex.co.uk

www.sonifex.co.uk

t:[phone]

t:[phone]
f:[phone]

f:[phone]
[e-mail]

[e-mail]

61 Station Road

61 Station Road
Irthlingborough

Irthlingborough
Northants NN9 5QE

Northants NN9 5QE
United Kingdom

United Kingdom