The BA-4120 DP is a fully monitored 4-channel 19˝ power amplifier, specifically engineered for use in professional PA (Public Address) systems operating with 100 V, 50 V, or 25 V distribution lines. Built for continuous operation, it offers outstanding reliability and performance in safety-critical environments.

With four powerful amplifier channels, the BA-4120 DP is suitable for a wide range of installations. Its electronically balanced inputs and outputs ensure interference-free signal transmission, effectively eliminating hum caused by ground loops. Four additional priority inputs are available for mandatory messages or emergency alerts.

Each channel can be equipped with an FD-20 pilot tone module for continuous function monitoring. The front panel features multi-color LED indicators that provide real-time information about system status and safety functions. A “Power Remote” function enables remote activation, and a soft-start circuit suppresses startup noise and protects connected equipment.

This amplifier is an ideal choice for high-reliability applications such as evacuation systems, transport terminals, shopping centers, or industrial buildings where consistent operation and audio clarity are essential.

Technical Data:

– Model: BA-4120 DP
– Output Power: 4 x 180 W (Program) / 4 x 120 W (RMS)
– Input Sensitivity: 0 dB (0.775 V), 66 kOhm, balanced
– Output Impedance: 25 V / 50 V / 100 V
– Frequency Response: 35 Hz – 20,000 Hz (better than –3 dB)
– Signal-to-Noise Ratio: >100 dB
– Total Harmonic Distortion (THD) @ 1 kHz: < 0.5%
– Input Filter: 400 Hz / –3 dB
– Power Consumption: 1300 W
– Current Draw at 230 V:
– At 1/8 load: 3 A
– At full load: 6.8 A
– AC Power Supply: 230 V, 50–60 Hz
– DC Backup Supply: 24 V
– Dimensions (W x H x D): 483 x 133 x 440 mm (3 RU)
– Weight: approx. 26.5 kg

Key Features:

– Four fully monitored amplifier channels
– Balanced inputs for program and priority audio
– Screw terminals for simplified wiring
– Front-panel LED indicators for status and fault monitoring
– Remote power-on capability via Power Remote contact
– Soft-start circuitry to suppress switch-on noise
– Designed for short-circuit and no-load resistance
– Compatible with FD-20 pilot tone monitoring module