DSPPA MP120B – 120W Mixer Amplifier with USB, 4 MIC Inputs & 100V Commercial Public Address System
The DSPPA MP120B is a professional rack-mounted mixer amplifier designed for commercial public address systems requiring multiple microphone inputs, stable performance, and reliable voice broadcasting. Featuring 120W output power, built-in USB player, 4 microphone inputs, and 100V speaker output, the MP120B is ideal for paging systems, announcements, and background music in medium-scale installations.
Technical Specifications:
Amplifier System:
- Type: Mixer Amplifier
- Model: MP120B
- Rated Output Power: 120W
- Output Mode: 100V constant voltage
Input Configuration:
Microphone Inputs:
- 4 × MIC inputs (unbalanced)
- Input Sensitivity: 3mV ±0.5mV
Line Inputs:
- 2 × AUX inputs
- Input Sensitivity: 200mV ±30mV
Line Output:
- 1 × AUX output (1V)
Audio Source:
- Built-in USB player (MP3 playback)
As shown on page 1, the amplifier integrates a USB player for direct audio playback without external devices.
Audio Performance:
- Frequency Response: 65Hz – 20kHz (±3dB)
- Distortion: <1%
- Signal-to-Noise Ratio: >80dB
- MP3 Input Sensitivity: 230–280mV
Control Features:
- Master volume control
- Individual volume control:
- MIC1 – MIC4
- LINE inputs
- Tone Control:
- Bass adjustment
- Treble adjustment
Priority Function:
- MIC1 priority override
- Attenuation: 0 to -30dB
This ensures announcements override background audio.
Monitoring & Indicators:
- 5-segment LED level meter for output monitoring
According to the front panel (page 2), the unit includes LED indicators, USB interface, and dedicated knobs for MIC, LINE, bass, and treble control.
Protection System:
- AC fuse protection
- DC voltage protection
- Overload protection
- Short-circuit protection
- Built-in alarm (siren trigger) on fault detection
Power & Electrical:
- Power Supply: AC 220–240V / 50–60Hz
- Power Consumption: 200W
Physical Specifications:
- Dimensions: 430 × 300 × 88 mm (2U rack)
- Net Weight: 7 kg
- Gross Weight: 10 kg
Key Features:
- 120W output power
- Built-in USB MP3 player
- 4 microphone inputs
- 2 AUX inputs + 1 AUX output
- MIC1 priority override
- Bass & treble control
- LED level meter monitoring
- Full protection system with alarm
- Rack-mount professional design
- Stable 100V PA output
Applications:
- Mosques
- Schools
- Offices
- Retail stores
- Factories
- Hospitals
- Paging systems
- Background music systems
- Medium commercial PA systems
Connect Gates Professional Opinion:
From Connect Gates’ perspective, the MP120B is a very reliable classic PA amplifier for projects that rely heavily on microphones and announcements. Compared to MP120UB, this model focuses more on microphone flexibility (4 MIC inputs instead of 2) but with fewer modern features like Bluetooth or FM. It is ideal for environments such as mosques, schools, and factories where voice clarity and multiple microphone inputs are more important than multimedia playback.