Sonifex RB-SSML1 Details
The RB-SSML1 is a 1U rack-mountable source selector for compressing or
limiting an incoming microphone
or stereo line signal and mixing
this signal with a stereo monitor
input, which can then be metered and mixed to two headphone outputs. The
unit is mainly used in situations where
level control is required, for example in voiceover applications.
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.
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