February 25, 2020
February 25, 2020
Show all



The mic input consists of an independent low-noise microphone pre-amplifier for converting microphone level signals to a line level. There are independent switches to control a high pass filter (low frequency roll-off at 125Hz) and to provide phantom power at +48V to the connected microphone. A preset pot on the rear panel allows adjustment of the mic gain from 36dB to 75dB.

A front panel switch selects between mic and line inputs. Both mic and line inputs have fully adjustable volume control via front panel pots, with the line input having an additional 10dB gain increase via a switch on the rear panel for use with unbalanced equipment. The mono mic input is converted to a stereo signal before being passed to the compressor/limiter.

The XLR-3 stereo monitor input has an adjustable volume control via a back panel recessed pot, and has an additional 10dB gain increase via a switch on the rear panel, for use with unbalanced equipment. The audio on this input is only present on the headphone outputs, and is therefore suitable as a return feed from a codec, a PC audio output, or similar equipment.

The compression ratio and threshold limits of the compressor/limiter section are fully adjustable via linear pots situated on the front panel. The threshold can be set between -30dBu and +20dBu. When the input signal rises above the threshold level a soft-knee compression is applied at the selected ratio. The compressor has an attack time of approximately 20ms and a release time of approx 400ms, and can operate at ratios of 1:1 (no compression) to :1 (limiting). A front panel BYPASS button can be used, where no compression is applied. A rear-panel DIPswitch allows compression only to be applied to the mic input and not the stereo line input.

The metering is carried out after the compressor/limiter section and consists of two rows of 12 round LEDs showing levels between -17dB and +11dB. An internal jumper allows the metering to follow either the stereo output, or the headphone monitor outputs and a rear panel DIPswitch can disable the peak hold display.
The XLR-3 stereo line output can be fed from either the mic or line input, but not the stereo monitor input. The line output is electronically balanced and can be wired unbalanced by grounding the non-phase signal, allowing you to feed both balanced and unbalanced equipment. A pushbutton switch is provided to reduce the output by 10dB for this purpose. An LED power indicator on the front panel displays the power supply connection.

RB-SSML1 Diagram RB-SSML1 Diagram.

See larger image >

Technical Specification For RB-SSML1

Audio Specification

Maximum Input Level:-10dBu (mic), +28dBu (line), electronically balanced
Input Impedance:20kΩ nominal balanced
Maximum Output Level:+28dBu
Output Impedance:<50Ω
Low Frequency Roll-Off:125Hz @ 6dB/octave
Gain Range (mic):Adjustable 36dB to 75dB gain (-80dB volume min.)
Volume Control (line):-80dB to +6dB gain (-70dB +16dB with additional input gain)
Distortion:<0.02% THD @ 1kHz, ref +8dBu output
Common Mode Rejection:>66dB typically
Phantom Power:48V
Frequency Response:20Hz to 20kHz ±0.3dB (600Ω load, ref 1kHz)


Mic Input:1 x XLR 3 pin female (Balanced)
Line Input:2 x XLR 3 pin female (Balanced)
Monitor Input:2 x XLR 3 pin female (Balanced)
Output:2 x XLR 3 pin male (Balanced, can be unbalanced)
Headphone Outputs:2 x ¼” (6.35mm) A-gauge 3-pole stereo jack sockets
Mains Input:Filtered IEC, 110V-120V, or 220-240V switchable, fused, 9W maximum
Fuse Rating:Anti-surge fuse 100mA 20 x 5mm (230VAC)
Anti-surge fuse 250mA 20 x 5mm (115VAC)

Equipment Type

RB-SSML1:Mic/Line source selector with compressor/limiter

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: 2.0kg
Nett: 2.9lbs Gross: 4.4lbs
Reviews 0


There are no reviews yet.

Be the first to review “SONIFEX RB-SSML1”

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.


Lost your password?


Your cart is currently empty.