Behringer Composer MDX 2100 Compressor / Gate 2 of 2

The Behringer MDX-2100 is a great all 'round compressor, expander and gate. Or, as their marketing people put it: "Audio Interactive Dynamics Processor". I first saw one of these units in the Studios 301 Mastering Suite (back when most of the top-40 albums went through them and EMI was selling out). They are very clean, quiet and reliable and I have not had any problems with them. They are working fine and every control works as expected and is noise-free.

This unit has had studio use only. There are some very small scratches around the rack mount holes and a couple of very minor scratches in the black paint on the top of the unit (nothing is visible when mounted in a rack). If it matters to you, I'll run a permanent marker over the top scratches. It is in excellent condition. Although I've only used this unit for recording, I've used others for live situations and permanent installations and they work well.

I don't have the original box or original manual. I'm happy to provide a copy of a manual for a related Behringer product with an explanation of the (minor) differences. I've shipped these sorts of things before without problems - if you want the unit posted it will be sent well packed and by registered parcel post.

I am selling two and they are in identical condition and separate lots.

Features - COMPRESSOR:

Stereo link - to allow for compression across a stereo signal without changing the spatial image.
Interactive Knee Adaptation - varies the knee shape of the compression curve
Peak Limiter that is independent of the compressor section (great for live sound and digital recording!)
Interactive Ratio Control circuit in the expander/gate
Extremely low noise, high-grade VCA's, quality potentiometers and switches
Side chain - for de-essing, special effects, linking, ...

Features - OTHER:

+4dBU or -10 dBV signal level
balance or unbalanced input (servo-balanced)
servo-balanced output
XLR or phono (tip-ring or tip-sleeve-ring) connections.
Power is by a mains IEC (kettle plug) lead - no plug packs.
Metal, solid, case.
Bypass and power fail-safe is relay operated (no-noise, no power on thump, signal passes if power lost)

SPECIFICATIONS
AUDIO INPUT

Connectors XLR and 1/4" jack
Type RF filtered, servo-balanced input
Impedance 50 kOhm balanced, 25 kOhm unbalanced
Nominal Operating Level +4 dBu/-10 dBV switchable
Max. Input Level +21 dBu balanced and unbalanced
CMRR typ. 40 dB, >55 dB @ 1 kHz

AUDIO OUTPUT

Connectors XLR and 1/4" jack
Type electronically servo-balanced output stage (optional transformerbalanced)
Impedance 60 Ohms balanced, 30 Ohm unbalanced
Max. Output Level +21 dBu, +20 dBm balanced and unbalanced

SC INPUT

Connector 1/4" jack
Max. Input Level +24 dBu

SC OUTPUT

Connector 1/4" jack
Type RF-rejecting, DC de-coupled, unbalanced output
Impedance 2 kOhm
Max. Output Level +21 dBu

SYSTEM SPECIFICATIONS

Bandwidth 20 Hz to 20 kHz, +0/-0.5 dB
Frequency Response 0.35 Hz to 200 kHz, +0/-3 dB
Noise > 95 dBu, unweighted, 22 Hz to 22 kHz
THD 0.008 % typ. @ +4 dBu, 1 kHz, Gain 1, 0.04 % typ. @ +20 dBu, 1 kHz, Gain 1
IMD 0.01 % typ. SMPTE
Crosstalk < -100 dB, 22 Hz to 22 kHz
Stereo Coupling true RMS detection

EXPANDER/GATE SECTION

Type IRC (Interactive Ratio Control) Expander
Threshold variable (OFF to +20 dB)
Attack <1 ms / 50 dB, program dependent
Release switchable (SLOW: 100 ms / 1 dB, FAST: 100 ms / 100 dB)

COMPRESSOR SECTION

Type IKA (Interactive Knee Adaption) Compressor
Threshold variable (-40 dB to +20 dB)
Ratio variable (1.2:1 to oo:1)
Auto characteristics Wave Adaptive Compressor
Manual Attack Time variable (0.5 ms / 20 dB to 100 ms / 20 dB)
Manual Release Time variable (0.05 s / 20 dB to 5 s / 20 dB)
Auto Attack Time typ. 15 ms at 10 dB, 5 ms at 20 dB, 3 ms at 30 dB
Auto Release Time program dependent, typ. 125 dB/s
Output variable (-20 to +20 dB)

PEAK LIMITER SECTION

Type IGC (Interactive Gain Control) Peak Limiter
Threshold variable (0 to OFF (+22 dBu))
Ratio oo:1
Stage 1 Limiter Type Clipper
Attack “zero”
Release “zero”

FUNCTION SWITCHES

KEY EXT switches the detector section to the external SC input
KEY LISTEN monitoring the external SC input, disengaging the normal audio
CONTOUR allows for frequency dependent detection
AUTO enables the automatic and program dependent setting of the Attack-/Release times, disengaging the manual Attack-/Release controls
IN/OUT METER switches between input and output for the level meter
IN/OUT relay controlled hard-bypass
OPERATING LEVEL changes the internal reference level from +4 dBu to -10 dBV
DUAL MONO / CH 1 MASTER linking both channels for stereo operation and channel 1 becomes master

INDICATORS

GAIN REDUCTION 12 element LED display: 1/2/4/6/9/12/15/18/21/24/27/30 dB
INPUT/OUTPUT LEVEL 12 element LED display: -30/-24/-18/-12/-6/0/+3/+6/+9/+12/+18 dB
Expander/Gate Threshold 2 LED for under “+” and above “-”
Compressor Threshold 3 LEDs for under “+”, Interactive “0” and above “+”
Peak Limiter Threshold 1 LED for Indication of Limiter function
Function switch LED indicator for each

OPTIONS

Output Transformer BEHRINGER transformer OT-1 refittable

POWER SUPPLY

Power Consumption max. 20 Watts
Mains Connection standard IEC receptacle

PHYSICAL

Dimension (H * W * D) app. 1 3/4" (44.5 mm) * 19" (482.6 mm) * 7 1/2" (190 mm)
Net Weight app. 2.2 kg
Shipping Weight app. 3.4 kg

Used

Below

Very Good

Compressor, Expander/Gate, Limiter