
AMX-20CX4
The preamp mixer AMX-20CX4 is a professional digital automatic preamplifier with 5" front display, DSP digital signal processor and excellent sound qualities.
The digital automatic preamplifier is equipped with 20 inputs and 4 outputs, phantom power, 10 input and 5 output PEQ, HPF filter (100Hz), MIC./LINE, digital automatic system DIGITAL SIGNAL DELAY FIELD with BARRIER GATE, GATE OPEN & GAIN CONTROL, 3 x digital frequency shifter with output select, 3 PRESETS, SD / USB player with BT receiver (for direct connection with Bluetooth-enabled devices), audio matrix and more.
The AMX-20CX4 pre-amp comes with further most modern technologies such as a built-in digital de-esser for dynamic attenuation of unwanted "ess" and sibilant sounds and a compressor / expander / limiter function for dynamic processing of audio signals and recordings.
NEW! AMX-"CX" series now with large 5" front display and innovative technical features:
By redesigning the front panel, Phoenix Professional Audio's AMX digital automatic preamplifiers have not only received a "face lift" – the new models now enable direct programming on the large 5" front display using the SETTINGS ENTER button. This makes setting the numerous parameters even more intuitive and easier.
The AMX-CX series is also full of technical innovations:
The new automatic pre-amps are equipped with three digital frequency shifters as a feedback lock with output select for outputs 1, 2 and 3. If necessary, three outputs can now be programmed with digital frequency shifters at the same time. The new series also has a digital de-esser with BYPASS function.
The integrated BT system (connection via Bluetooth-enabled devices) has been supplemented with a powerful external antenna and a security function, which now enables BT Pair with password protection.
Other new features include the SD / USB player with title display and three PRESETS P1 / P2 / P3 with a selection button on the front.
The AMX-20CX4 automatic preamplifier is designed for professional PA applications in acoustically challenging rooms (building acoustics), such as churches and cathedrals, and is used where most other devices do not produce a positive outcome or an entire rack of system components would have to be built to provide a reasonable acoustical result.
The 16 universal inputs can be switched by DIP switches between MIC and LINE sensitivity. Each of the 16 universal inputs has switchable phantom power and a HPF filter (100 Hz).
The universal inputs are equipped with a switchable automatic microphone system - DIGITAL SIGNAL DELAY FIELD system (DSDF). Only microphones being addressed are automatically activated and are controlled and monitored by the processor system (DSDF). Unnecessary open microphone channels are closed.
The input matrix (DIP switches) can be used to assign the input channels 1-16 to the outputs MAINSUM-2 and / or the output MAINSUM-3.
The built-in MP3 player module with BT receiver (including IR remote control) has inputs for USB sticks and a SD memory card and will perfectly accompany you during the operation. The integrated BT receiver supports all common Bluetooth-enabled devices and allows you to wirelessly transfer music or pre-made texts from your mobile phone, computer or MP3 player to the amplifier and play it.

Specials
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NEW: Direct programming on large 5" LC front display
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NEW: Digitale de-esser with BYPASS function
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NEW: 3 x digital frequency shifter as feedback lock with output select for outputs 1, 2 and 3
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NEW: BT system with powerful external antenna + BT pair with password protection
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NEW: SD / USB player with title display
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NEW: Three PRESETS P1 / P2 / P3 can be saved (with plain text and calendar function)
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Remote control PV-CX-PRESET (for PRESETS P1 / P2 / P3) - optionally available
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16 inputs on XLR (MIC.-LINE), 4 LINE inputs (LINE 17-18), on RCA (LINE 19-20), on XLR
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16 x inputs with automatic microphone system DIGITAL SIGNAL DELAY FIELD (DSDF)
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1 x de-esser with FULL / SPLIT and AIR function (master)
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Compressor / expander / limiter
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10 input parametric EQ
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4 x 5 output parametric EQ, 4 delays, 4 volume controls & automatic feedback limiter
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4 DSP MASTER outputs 1 to 4; configuration of output no. 4 as x-over SUB output possible
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MP3 player with USB port, SD card reader and BT receiver
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Digital input NOISE-GATE & signal limiter (software)
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Two input groups IN-1 (inputs 1-20 with ROUTING to outputs 1-3) and IN-2 (inputs 17-20 with ROUTING on output 4, (SWITCHING MATRIX)
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Freely programmable calendar function
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INFO-OUT (PRESETS-2) potential-free relay. Additional speaker lines can i.e. be connected to presets 2
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PRE-MASTER & EQ output (signal output before MASTER and audio DSP)
Product safety information
Manufacturer information:
PHOENIX Professional Audio GmbH
Hermann-Oberth-Str. 12
Bayern
Bruckmühl, Deutschland, 83052
info@phoenix-pa.com
https://www.phoenix-pa.com

Technical Details
10-point parametric EQ at DSP input |
± 12 dB, 0.05 3oct; 20Hz 21.2kHz |
5-point parametric EQ on 4 outputs |
± 12 dB, 0.05 3oct; 20Hz 21.2kHz |
Accessories |
19" mounting angles integrated |
Audio input |
16 x MIC.-LINE + 2 x RCA + 2 x XLR |
Audio output |
6 x process audio out |
Automatic mixer |
DIGITAL SIGNAL DELAY FIELD |
Automatic MODES |
yes, automatic activation through presets P1, P2, P3, day / week / month / year programs |
Automatic NOISE GATE |
Yes |
BT / Bluetooth |
BT receiver on board (direct connection via Bluetooth-enabled devices); BT device pairing with password protection; BT system with powerful external antenna |
Colour |
graphite |
Conference configuration / priority |
Yes |
Control LEDs |
Yes |
DeEsser |
Digital DeEsser with BYPASS function; FULL, SPLIT and AIR function; 800Hz - 8kHz; 0dB - -20dB |
Delay on 4 outputs |
0 - 85 m |
Dimensions W / H / D [mm] |
483 x 270 x 340 |
Display |
Yes |
Display LEDs |
Yes |
EQ |
Yes |
Equalization Parametric EQ |
Yes |
Expander Compressor Limiter |
Yes |
Feedback limiter |
Adaptive or phase shift |
Frequency response |
40 Hz to 22,000 Hz @ -3dB |
Frequency shifter |
3 x digital frequency shifters as feedback lock with output select for outputs 1, 2 and 3 |
Gain (entrance) |
Yes |
Gain (system) |
Yes |
Gain / filter |
Yes |
Gain control |
For all MIC.-LINE inputs, analogue on the back of the device, digital in the device configurator |
Gate Attack |
Yes |
Gate level |
Yes |
Gate release |
Yes |
Line inputs |
Yes |
Line outputs |
Yes |
Weight |
12.5 kg |
MIC inputs |
Yes |
MP3 player |
MP3 player with title display; with USB / SD ports; with BT receiver (direct connection via all Bluetooth enabled devices) |
Output PRO-OUT |
Yes |
PEQ (system) |
Yes |
Phantom power |
switchable 48VDC (DIP-switch) |
Power supply |
230 VAC - 50/60 Hz |
Presets |
Three PRESETS P1, P2, P3 with selection button on the front, with plain text |
Priority input (LINE) |
yes (conference configuration) |
Programmed balanced microphone / line inputs |
Input XLR: 1-16 |
- Switch MIC / LINE |
Yes |
- Sensitivity MIC |
-40dB -15dB |
- Sensitivity LINE |
-15dB + 5dB |
- Impedance |
1.6 kΩ |
- HPF filter |
100 Hz, 6dB / oct. |
- Regulation: bass, soprano |
± 12dB, 100 Hz, 10 kHz, shelving filter |
- Signaling LED |
green LED channel active, red LED overload |
Protection circuits |
Limiter, short circuit, overheating, overload, softstart, subsonic |
REC OUT |
Yes |
Remote Control |
Option: PV-CX-PRESET Presets remote activation |
Settings |
SETTINGS ENTER control for direct programming; with all associated information visible on the 5" front display |
Signal to Noise Ratio |
Can be set in the device configurator @ NOISE GATE / ON |
Subwoofer output |
Assigned channel 16 as well as universal inputs 17-20 |
System software |
Yes |
THD |
<0.08% |
Universal input (mono) |
Input RCA: 17 u. 18; XLR: 19,20 |
- input sensitivity |
-10dB + 12dB |
- Impedance |
10 kΩ |
- Regulation: bass, soprano |
± 12dB, 100 Hz, 10 kHz, shelving filter |
Working temperature |
from -5° C to + 40° C |

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