MVC 121 Plus

Three Input Stereo Mixer with DSP
Key Features
  • Mixes two microphone inputs and one stereo line input to two stereo outputs
  • DSP audio signal processing
  • 24-bit/48 kHz analog-to-digital and digital-to-analog converters
  • Fixed, low latency DSP processing
  • DSP Configurator™ Software
  • Intuitive Graphical User Environment
The Extron MVC 121 Plus
Model Version Description Part #
MVC 121 Plus Three Input Stereo Mixer with DSP 60-1096-01

The Extron MVC 121 Plus is a compact, three input stereo audio mixer featuring a digital signal processing platform for audio signal mixing and control. The MVC 121 Plus features a stereo line level input and two mic/line level inputs with 48 volt phantom power for condenser microphones, plus fixed and variable stereo line level outputs. It offers gain, filter, tone processing, and parametric EQ. Quick and intuitive configuration using the DSP Configurator™ Software allows the MVC 121 Plus to be installed in very little time. The MVC 121 Plus is ideal for presentation applications that require line and microphone audio mixing with DSP in a small form factor.


The DSP built into the MVC 121 Plus provides wide dynamic range and utilizes 24-bit audio converters with 48 kHz sampling to maintain audio signal transparency. Convenient, easy-to-configure tools are available to control level, high and low pass filters, and bass and treble shelving filters.

Easy-to-Use DSP Configurator Software

The DSP Configurator Software features an intuitive on-screen layout that offers fast access to digital audio signal processing tools as well as audio mixing. Designers can quickly get a snapshot view of the entire audio system, including processing blocks and mix points.

Flexible Mixer

The MVC 121 Plus features a stereo line level input and two mic/line level inputs, each of which are mixed into the fixed and variable stereo line level outputs. It provides a quick and effective solution for adding microphone capability to an existing system. The variable line level output can be sent to a PA system, while the fixed line level output can be routed to an assistive listening system.

Versatile Control Options

The MVC 121 Plus can conveniently be controlled and configured via RS-232 serial control or USB. It also includes digital input ports, which allow for muting.


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MVC 121 Plus
   Gain Unbalanced output: -6 dB; balanced output: 0 dB
   Frequency response 20 Hz to 20 kHz, ±0.3 dB
   THD + Noise <0.02% @ 1 kHz, at maximum output level
   S/N >100 dB, 20 Hz to 20 kHz, at maximum output, unweighted
   Crosstalk <-90 dB @ 1 kHz, fully loaded
   CMRR >60 dB @ 1 kHz
Audio input
   Number/signal type 
      Microphone inputs 2 mono, mic/line, balanced/unbalanced
      Line input 1 stereo, line, balanced/unbalanced
      Microphone inputs (1) 3.5 mm captive screw connector, 6 pole
      Line input (1) 3.5 mm captive screw connector, 5 pole
   Impedance >10k ohms, balanced/unbalanced, DC coupled
   Nominal level +4 dBu when level is set to 0 dB gain; adjustable from -60 dBu to +4 dBu (line input)
   Maximum level +21 dBu, balanced, when input gain is set to 0 dB
   Volume range 
      Line input -18 dB to +24 dB, adjustable per input
      Mic input -18 dB to +60 dB, adjustable per input
   Mic noise level <-120 dBV (1 µVrms) at 40 dB gain
   Mic phantom power +48 VDC, which can be switched on or off
    NOTE     0 dBu = 0.775 Vrms, 0 dBV = 1 Vrms, 0 dBV ≈ 2 dBu
Audio processing
   D/A conversion 24 bit, 48 kHz sampling
Audio output
   Number/signal type 2 stereo, line, balanced/unbalanced
   Connectors (2) 3.5 mm captive screw connector, 5 pole
   Impedance 50 ohms unbalanced, 100 ohms balanced
   Gain error ±0.2 dB channel to channel
   Maximum level (Hi-Z) >+21 dBu, balanced; >+15 dBu, unbalanced
Control/remote — mixer/volume controller
   Serial control port 1 bidirectional RS-232: 3.5 mm captive screw connector, 6 pole (uses 3 poles) (shared with digital input)
   Baud rate and protocol 9600 to 115200 baud, 38400 baud (default), 8 data bits, 1 stop bit, no parity, no flow control
   Serial control pin configuration 1 = Tx, 2 = Rx, 3 = GND
   USB control port 1 front panel female mini USB B
   USB standards USB 2.0, low speed
   Program control Extron control/configuration program for Windows®
Extron Simple Instruction Set (SIS)
Control — digital input ports
   Number/type 3 digital input (configurable)
   Connector (1) 3.5 mm captive screw connector, 6 pole (shared with RS-232 port, uses 4 poles)
   Pin configuration 3 = GND; 4, 5, 6 = digital inputs 1, 2, 3
   Digital inputs 
      Input voltage range 0-24 VDC
      Input impedance 10k ohms
      Threshold low to high >2.0 VDC
      Threshold high to low <0.8 VDC
   Power External
Input: 100-240 VAC, 50-60 Hz
Output: 12 VDC, 0.5 A
   Power consumption
      Device 3.5 watts
      Device and power supply 4.9 watts
   Thermal dissipation
      Device 9.4 BTU/hr
      Device and power supply 14.7 BTU/hr
   Temperature/humidity Storage -40° to +158°F (-40° to +70°C) / 10% to 90%, noncondensing
Operating +32° to +122°F (0° to +50°C) / 10% to 90%, noncondensing
   Cooling Convection, no vents
      Rack mount Yes, with optional 1U rack shelf
      Furniture mount Yes, with optional mini under-desk mounting kit
      Pole mount Yes, with mini pole mount kit
   Enclosure type Metal
   Enclosure dimensions 1.7" H x 4.3" W x 3.0" D (1U high, quarter rack wide)
(4.3 cm H x 10.9 cm W x 7.6 cm D)
(Depth excludes connectors and knobs.)
   Product weight 0.6 lbs (0.3 kg)
   Regulatory compliance CE, C-tick, c-UL, UL, FCC Class A, ICES, VCCI
   Product warranty 3 years parts and labor
   Everlast power supply warranty 7 years parts and labor
    NOTE     All nominal levels are at ±10%.
    NOTE     Specifications are subject to change without notice.
Shipping Dimensions and Weights
    Part # Height Width Depth Weight
    60-1096-01 2.75" (7.0 cm) 10.12" (25.7 cm) 7.43" (18.9 cm) 1.86 lbs (0.84 kg)


Application Diagram

Panel Drawing

Panel Drawing
© 2020 Extron. Specifications are subject to change without notice.