Technical data
Outputs, speakers	100 V or 70 V and low-impedance 4 Ohm
Frequency range	45 - 20.000 Hz (-3dB)
Total harmonic distortion	better than 0.3% at 1 kHz
Power supplies	230 V mains power (50/60 Hz) and 24 V DC (emergency power supply)
Power consumption	1317 W – 1/8: 3.28 A – rated: 7.16 A
Outputs	REC OUT: 0 dBu (775 mV), 3 kOhm, unbalanced; MONITOR: 0 dBu (775 mV), 200 Ohm, unbalanced; FAULT: Relay with changeover contact, 24 V max. 500 mA 24 V; EMER. OUT: 24 V DC 200 mA for mandatory reception relay
Noise level	MIC: better than 75dB; LINE: better than 90dB
Inputs	MIC/LINE 1-3: -50 dBu (2.45 mV), 5 kOhm, symmetrical; MIC/LINE 1-3: -10 dBu (245 mV), 15 kOhm, symmetrical; LINE 4-5: -10 dBu (245 mV), 15 kOhm, symmetrical; PAGING: -10 dBu (245 mV), 10 kOhm, symmetrical
Dimensions (W x H x D)	483 x 88 x 352 mm; 2 HE
Output power	4x 120 W RMS (max. 4x 180W)

The MXA-4120A from RCS Audio-Systems is a 4-channel mixing amplifier designed for professional sound reinforcement in buildings, facilities, or installations. It features an integrated 5-in-4 matrix, enabling up to five different input signals to be distributed flexibly to four separate speaker zones. Each zone is powered by its own integrated 100-V power amplifier, with a rated output power of 120 W RMS per channel (maximum 180 W). The amplifiers are designed for operation with 100 V or 70 V high-voltage lines as well as for low-impedance speakers at 4 Ohm. The frequency response is 45 Hz to 20,000 Hz (-3 dB), ensuring clear and detailed sound across the entire audible range. The total harmonic distortion is better than 0.3 % at 1 kHz, indicating high signal purity. The noise level is better than 75 dB for microphone inputs and better than 90 dB for line inputs, ensuring good signal-to-noise ratio quality.

Applications
This amplifier is suitable for applications in multi-zone buildings such as schools, hospitals, office complexes, or industrial facilities, where central, zone-specific sound reinforcement is required. The integrated matrix enables flexible signal distribution, allowing different sources such as microphones, music signals, or emergency systems to be directed independently to different zones. Support for backup power supply via 24 V DC makes it suitable for critical applications where interruption of sound reinforcement is not acceptable.

Functions and Equipment in Detail
Inputs 1 to 3 are switchable between MIC and LINE signals and feature a gain control as well as switchable phantom power. These inputs always have priority over inputs 4 and 5. Inputs 1–3 are equipped with combo jacks, while inputs 4 and 5 use RCA jacks. Each of the five inputs has separate volume, treble, and bass controls. A PAGING input on screw terminals allows connection to telephone paging systems with highest priority. Additionally, there are contacts for remote control of an integrated gong (2- or 4-tone) before announcements, as well as for triggering a siren (all-call). An integrated control speaker with zone selection and volume control enables on-site function testing.

Technology Explained Simply
The matrix function allows five different signal sources (e.g. microphone, music, emergency) to be distributed to four different speaker zones, with each zone being independently controllable. The outputs are designed for 100 V and 70 V high-voltage lines as well as for 4-Ohm low-impedance amplification, enabling flexible connection to existing speaker systems. Power supply is via 230 V mains (50/60 Hz) or 24 V DC (backup power supply), ensuring continuous operation even during power failure. Power consumption during operation is 1317 W, with a rated current of 7.16 A.

Compatibility and Accessories
The MXA-4120A is specifically designed for use with the call stations VLM-100A, MXM-104, and MXE-400W. Up to four wall-mounted call stations MXE-400W can be connected, with one call station assigned per zone. The MXE-400W call station features an integrated text memory with a maximum recording duration of 60 seconds. The MXM-104 call station enables remote control of the four speaker zones and triggering of an all-call signal. The VLM-100A call station offers digital control with zone selection and status indication via LEDs.

Mounting and Installation
The amplifier has dimensions of 483 x 88 x 352 mm (W x H x D) and is built in a 2 U format, making it suitable for installation in standard 19-inch racks. Installation requires connection to a 230 V mains power supply as well as wiring of the speaker zones and input signals. The connections are clearly labeled and include, among others, speaker outputs, inputs for microphones and line signals, the PAGING input, the control speaker, and the fault alarm output.

Advantages in Operation
The MXA-4120A offers high flexibility through the integrated matrix, clear signal processing with low distortion and high noise level, as well as the possibility of backup power supply. The separate control of volume, treble, and bass per input enables precise tone adjustment. Integrated control functions such as the control speaker and fault alarm output (changeover contact) facilitate maintenance and monitoring. Compatibility with various call stations expands the range of applications in complex sound reinforcement systems.

Functions and Equipment in Detail
Inputs 1–3 are switchable between MIC and LINE signals and feature a gain control as well as switchable phantom power. These inputs always have priority over inputs 4 and 5. Inputs 1–3 are equipped with combo jacks, while inputs 4 and 5 use RCA jacks. Each of the five inputs has separate volume, treble, and bass controls. A PAGING input on screw terminals allows connection to telephone paging systems with highest priority. Additionally, there are contacts for remote control of an integrated gong (2- or 4-tone) before announcements, as well as for triggering a siren (all-call). An integrated control speaker with zone selection and volume control enables on-site function testing.

Technology Explained Simply
The matrix function allows five different signal sources (e.g. microphone, music, emergency) to be distributed to four different speaker zones, with each zone being independently controllable. The outputs are designed for 100 V and 70 V high-voltage lines as well as for 4-Ohm low-impedance amplification, enabling flexible connection to existing speaker systems. Power supply is via 230 V mains (50/60 Hz) or 24 V DC (backup power supply), ensuring continuous operation even during power failure. Power consumption during operation is 1317 W, with a rated current of 7.16 A.

Compatibility and Accessories
The MXA-4120A is specifically designed for use with the call stations VLM-100A, MXM-104, and MXE-400W. Up to four wall-mounted call stations MXE-400W can be connected, with one call station assigned per zone. The MXE-400W call station features an integrated text memory with a maximum recording duration of 60 seconds. The MXM-104 call station enables remote control of the four speaker zones and triggering of an all-call signal. The VLM-100A call station offers digital control with zone selection and status indication via LEDs.

Mounting and Installation
The amplifier has dimensions of 483 x 88 x 352 mm (W x H x D) and is built in a 2 U format, making it suitable for installation in standard 19-inch racks. Installation requires connection to a 230 V mains power supply as well as wiring of the speaker zones and input signals. The connections are clearly labeled and include, among others, speaker outputs, inputs for microphones and line signals, the PAGING input, the control speaker, and the fault alarm output.

Advantages in Operation
The MXA-4120A offers high flexibility through the integrated matrix, clear signal processing with low distortion and high noise level, as well as the possibility of backup power supply. The separate control of volume, treble, and bass per input enables precise tone adjustment. Integrated control functions such as the control speaker and fault alarm output (changeover contact) facilitate maintenance and monitoring. Compatibility with various call stations expands the range of applications in complex sound reinforcement systems.