Redbox RB-SM2 - Audio Equipment Sonifex - Free user manual and instructions
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| Type | Audio Interface / Stereo Microphone Preamplifier |
| Model | Redbox RB-SM2 |
| Brand | Sonifex |
| Form Factor | 1U Rackmount |
| Dimensions (W x H x D) | 19 x 1.75 x 6 inches (approx. 483 x 44 x 152 mm) |
| Weight | 5.5 lbs (approx. 2.5 kg) |
| Power Supply | Internal, 100-240V AC, 50/60 Hz |
| Power Consumption | 15 Watts max |
| Number of Channels | 2 (Stereo) |
| Inputs | XLR female (balanced) for microphones, line inputs (balanced TRS) |
| Outputs | XLR male (balanced) line outputs, RCA unbalanced outputs |
| Phantom Power | +48V switchable per channel |
| Gain Range | 0 to 60 dB |
| Frequency Response | 20 Hz - 20 kHz ±0.5 dB |
| Total Harmonic Distortion + Noise (THD+N) | < 0.01% at 1 kHz, +4 dBu output |
| Signal-to-Noise Ratio (SNR) | > 105 dB (A-weighted) |
| Maximum Input Level | +22 dBu (balanced) |
| Maximum Output Level | +28 dBu (balanced) |
| Controls | Gain knobs, phantom power switches, output level control |
| Indicators | Power LED, signal presence LEDs (green), peak LEDs (red) |
| Cleaning Instructions | Disconnect power before cleaning; use a dry, lint-free cloth; do not use solvents. |
| Safety | Class I equipment; ensure grounding; do not block ventilation slots. |
| Spare Parts / Repairability | Contact authorized Sonifex service centers; internal components not user-serviceable. |
| General Information | Professional-grade stereo mic preamp with low-noise design and robust build. |
Frequently Asked Questions - Redbox RB-SM2 Sonifex
How do I connect the Redbox RB-SM2 to my mixer?
Connect the balanced XLR outputs to your mixer's line inputs using XLR cables. Ensure both devices are powered off during connection.
Can I use dynamic and condenser microphones with the RB-SM2?
Yes. For condenser microphones, switch on the +48V phantom power for the corresponding channel. Dynamic microphones do not require phantom power.
What is the maximum input level for line inputs?
The maximum input level before clipping is +22 dBu on the balanced TRS line inputs.
How do I adjust the gain on the RB-SM2?
Turn the Gain knob clockwise to increase sensitivity. Use the signal presence and peak LEDs to optimize level without clipping.
Does the unit come with rackmount ears?
Yes, the 1U rackmount ears are attached. They can be removed for standalone use.
What is the frequency response of the RB-SM2?
The frequency response is 20 Hz to 20 kHz ±0.5 dB, ensuring accurate sound reproduction.
How do I clean the front panel?
Disconnect power. Wipe gently with a dry, lint-free cloth. Avoid using any liquids or abrasive cleaners.
Is the power supply universal voltage?
Yes, the internal power supply accepts 100-240V AC, 50/60 Hz, suitable for worldwide use.
What should I do if the red clip LED lights up?
Reduce the Gain knob or the output level to prevent distortion. The clipped audio may cause damage to downstream equipment.
Can I use the RCA outputs simultaneously with the XLR outputs?
Yes, both output types are active simultaneously. However, note that the RCA outputs are unbalanced and may have lower output level.
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USER MANUAL Redbox RB-SM2 Sonifex
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Product information
Brand : Sonifex
Model : Redbox RB-SM2
Category : Audio Equipment