BST UPX4120 - 5-channel mixer with integrated 4x120W amplifier, 4-zone matrix and USB/SD reader

BST UPX4120 – 5-channel mixer with integrated 4x120W amplifier, 4-zone matrix and USB/SD reader

The BST UPX4120 combines a 5-channel mixer with a powerful 4x120 W amplifier and a 4-zone matrix, ideal for PA, background music, and alarm system installations. It includes an MP3 player compatible with SD cards and USB drives up to 32 GB, three XLR/jack combo inputs for microphone or line with front priority and +48 V phantom power, two RCA auxiliary inputs, gain and bass and treble equalization controls per channel, and a 6-LED VU-meter level display per channel. The zone matrix has a front-mounted selector and independent level adjustment per zone, as well as a monitor channel with a 1 W amplifier. Its outputs accept 100 V, 70 V, or 4 Ω lines, and its progressive-speed fan ventilation guarantees stable operation. With a 19″ 3U rack format and dual 220–240 Vac / 24 Vdc power supply, it offers professional reliability in critical environments.

Main features

• 5-channel mixer with volume, gain, and bass/treble equalization per channel.
• 3 XLR/jack combo inputs (microphone/line) with +48 V phantom and front priority function.
• 2 RCA auxiliary inputs.
• Integrated MP3 player for SD and USB (up to 32 GB) with LCD screen.
• 4-zone matrix with front selector and independent level control.
• Integrated amplifier 4×120 W for larger area 1 W for monitor.
• Speaker outputs: 100V/70V/4Ω lines and balanced line outputs per zone.
• Front 6-LED VU meter for each channel.
• Priority input for telephone line or other signal with automatic mute.
• Short circuit and overheating protections.
• Variable speed cooling fan.
• 19″ 3U rack format with polished aluminum front and handle.
• Dual power supply: 220–240 Vac (50–60 Hz) and 24 Vdc.

Product benefits

• Versatile zonal distribution: Allows different content to be directed to four areas simultaneously.
• Priority and security: Urgent calls or announcements on the microphone or phone automatically prevail.
• Operational agility: Direct controls on the front for quick adjustments without resorting to external hardware.
• Audio Quality: Individual equalization and low distortion ensure clarity in music and voice.
• Continuous reliability: Progressive ventilation and dual power supplies prevent interruptions in critical environments.

Use cases

Public address systems in schools, hospitals, and shopping centers; background music distribution in restaurants and hotels; evacuation and alarm systems in airports and stations; and multi-zone management for conference rooms and auditoriums.

Frequently Asked Questions

• Can I use SD and USB simultaneously? Yes, the system automatically switches playback between both sources.
• How do you adjust the output level per zone? Each zone has a potentiometer on the front panel to adjust its volume.
• Is it possible to power only with 24 V DC? Yes, the 24 V DC input allows for emergency operation in the event of a power failure.

Description for projects

5-channel mixer with +48 V phantom power, equalization, and VU meter per channel; USB/SD MP3 player up to 32 GB; 4-zone matrix with selector and level control; integrated 4x120 W + 1 W monitor amplifier; 100 V/70 V/4 Ω and balanced line outputs; microphone and phone priority; progressive fan; protections; 19″ 3U rack; 220–240 Vac/24 Vdc power supply; dimensions 484 x 440 x 132 mm; weight 11.68 kg.