Overview: The JBL VMA2120 is a cost-effective and flexible commercial mixer/amplifier
for installed sound applications. Featuring 120 Watts of power per channel, it
has 8 input channels and 2
output channels, which can drive either 4 or 8 Ohm speakers or 70V/100V
speakers. It also includes VOX ducking
during announcements, independent bass and treble controls for each output
channel, remote capability with JBL's optional wired volume control, and MP3 file
the front panel USB input or a Bluetooth connection.
Inputs: The VMA2120's 8 inputs are as follows:
- Inputs 1 and 4: These are both unbalanced 1/4" TRS jacks located
on the front panel.
- Inputs 2 and 5: These inputs have both unbalanced 1/4" TRS jacks
and balanced 5-pin Euroblock connectors. The Euroblock connectors include
priority contacts that will duck other channels during an announcement when
the contacts are closed, such as when using a push-to-talk microphone.
- Inputs 3 and 6: Both of these inputs include a 3-pin Euroblock
connector and dual unbalanced RCA jacks. Stereo sources are summed into a
- Music1 and Music2: These inputs are both dual unbalanced RCA
jacks. Signals are summed into mono.
- USB: A front panel USB port is provided for MP3 file playback.
- Remote Inputs: The rear panel includes two RJ-45 style sockets to
use with JBL's optional
CSR-V remote volume control modules. One for each
output channel is provided.
Outputs: The VMA2120 utilizes two Barrier Strips for the output
channels. Each strip has set-screw connections that include + and - terminals
for a 4 or 8Ω connection as well as 70V, 100V, and
COM terminals for high impedance speakers. These can accept speaker wire up to
Front Panel: The VMA2120 controls include
a main power switch, Bluetooth pairing button, 2 rotary Master output level
controls (one per output channel), 8 rotary input level controls (one for each
input), Bass and Treble controls for each output channel with +/- 14dB
adjustment at 50Hz and 10kHz. The front panel also includes an LCD screen and
media playback controls for the USB and Bluetooth sources. Controls include:
Play/pause, Stop, Next, Previous, Loop, Record, and media Volume +/-.
Note: The front panel LCD is only
used for displaying media information. All configurations are done using the
DIP switch panels.
DIP Switch Configuration: The VMA2120 has
3 DIP switch panels used to configure the inputs and outputs, giving it a lot of
flexibility. By default, Input channels 1-3, Music 1, and Bluetooth/USB are sourced to
amplifier 1. Input channels 4-6 and Music 2 are routed to amplifier 2. The user
may take any input and have it routed to both outputs by selecting the
appropriate switch. Each of the output channels has its own DIP switch
configuration. The DIP switch Input/Output sections are as follows:
Channel 1 Output
Channel 2 Output
Input 1 to CH2
70V/100V - On/Off
70V/100V - On/Off
Input 2 to CH2
Chime - On/Off
Chime - On/Off
Input 3 to CH2
Input 1 Line/Mic - Line/Mic
Input 4 Line/Mic - Line/Mic
Music 1 to CH2
Input 2 Line/Mic - Line/Mic
Input 5 Line/Mic - Line/Mic
BT/USB to CH2
Input 2 Phantom - On/Off
Input 5 Phantom - On/Off
Input 4 to CH1
Input 3 Line/Mic - Line/Mic
Input 6 Line/Mic - Line/Mic
Input 5 to CH1
Input 3 Phantom - On/Off
Input 6 Phantom - On/Off
Input 6 to CH1
Music 2 to CH1
70V/100V Output Setting: This DIP switch determines whether the
amplifier is configured to drive low impedance speakers (4Ω/8Ω)
or 70V/100V speakers. When set for high impedance speakers, a 70Hz high-pass
filter is automatically applied.
Chime Function: This DIP switch setting
enables a chime sound at the onset of an announcement when priority muting is
Line/Mic Switch: This setting will be
determined by the strength of the input signal. Switching to Mic activates 48dB
of additional gain to the signal.
Phantom Power: The amplifier can apply
27V of phantom power to that input if the microphone requires it.
VOX Function: Voice activated ducking is
available for input channels 2 and 5. The audio input level required to activate
ducking is set using the two trim pots on the rear panel (one for each input).
Turning them counterclockwise will reduce the level while full clockwise will
disable the VOX function.
Priority Muting: Input channels 2 and 5
can mute all other channels if pins 4 and 5 are shorted together using a switch
such as a push-to-talk microphone. Input 2 can have priority over all inputs going to
amp CH1 and Input 5 can have priority over all inputs going to amp CH2. Input
2 will have priority over both amplifier output channels if input DIP switch #2
is set to On.
Media Playback: The JBL VMA2120 allows MP3
file playback from either the front panel USB input or a Bluetooth connected
device. A front panel button allows quick and easy pairing of Bluetooth devices.
Remote Volume Control: Each of the 2
output channels has an RJ45 connector on the back panel for using an optional
CSR-V wall-mounted, remote, volume control.
Rack Mounting: The VMA2120 includes
optional front and rear brackets allowing it to be mounted in a standard 19"
- Maximum Power: 120 Watts into 4Ω or
- Number of Input Channels: 8
- Number of Output Channels: 2
- Tone Controls:
- Bass +/- 14dB @ 50Hz
- Treble +/- 14dB @ 10kHz
- Input Sensitivity:
- Mic input: 5.5mV
- Line input: 1.3V
- RCA input: 130mV
- Frequency Response:
- 4/8Ω Output: 20Hz - 20kHz +/- 2dB
- 70V/100V Output: 80Hz - 15kHz +/- 3dB
- Total Harmonic Distortion (THD):
<0.5%, 20Hz - 20kHz
- Signal-to-Noise Ratio: >76dB
- Input Impedance (Nominal):
- Mic: 400Ω
- Line: 20kΩ (balanced)
- RCA: 50kΩ
- Phantom Power: 27 VDC
- Crosstalk: -70dB
- Width = 17.0"
- Height = 3.875"
- Depth = 18.0"
- Weight: 29.3 lbs.