BST UPA120 - 40W 100V Line Mixer Amplifier

BST UPA120 – 120W 100V Line Mixer Amplifier

The BST UPA120 is a 100V, 120W line mixer amplifier designed for PA systems in small and medium-sized installations such as retail stores, restaurants, classrooms, and offices. Its 19" (2U) rack-mount chassis features a 5mm brushed aluminum front panel and aluminum knobs for a professional finish and high durability. It features three microphone inputs (one priority and one +48V phantom power), two line inputs, two auxiliary inputs, and two emergency (EMC) inputs, as well as a telephone input. The line output is complemented by constant voltage (100V/70V) and low impedance (4–16Ω) terminal block outputs. A two-band equalizer and 100Hz–18kHz frequency response guarantee clear voice and background music playback, while multiple protection circuits against short circuit, overload, and overtemperature ensure continuous, safe operation.

Main features

• Output power: 120 W on 100 V line.
• Tickets:
  • 3× microphone (XLR/jack) — Mic 1 with priority and phantom +48 V
  • 2x line (RCA/jack)
  • 2× auxiliary (RCA)
  • 2× EMC (jack) — priority and automatic mute
  • 1× telephone (jack) with adjustable level
• Line output: 1× jack/terminals.
• Speaker outputs: 100 V / 70 V / 4–16 Ω (terminal blocks).
• 2-band equalizer: bass (100 Hz) and treble (10 kHz) ±10 dB.
• Frequency response: 100 Hz – 18 kHz.
• Protection circuits: short circuit, overload and over temperature.
• 5mm brushed aluminum front and aluminum buttons.
• 19″ rack format, 2 U (482 × 88 × 345 mm); net weight 9.58 kg.
• Power supply: 230 V AC / 50 Hz.

Product benefits

• Professional reliability: Advanced protection and rugged design for continuous use.
• Connection flexibility: Universal inputs and outputs adaptable to multiple sources and speakers.
• Clarity and control: Precise equalization and emergency priority ensure maximum intelligibility.
• Easy installation: Standard rack and easy-to-wire terminals reduce assembly times.

Use cases

Recommended for PA systems in retail stores, cafes, small classrooms, and offices; background music in offices and reception areas; and emergency announcements and customer service with microphone priority.

Frequently Asked Questions

• How does priority work on Mic 1 and EMC? When Mic 1 or an EMC input is activated, the amplifier automatically attenuates other sources and mutes them according to the configured level.
• What speakers can I connect? 100V, 70V, or low-impedance speakers between 4 and 16 Ω, without exceeding the maximum power rating.
• Can I adjust the bass and treble while on stage? Yes, using the front-facing knobs on the two-band EQ.

Description for projects

100 V, 120 W line mixer amplifier; 3 mic inputs with +48 V phantom power on mic 1 and priority, 2 liner, 2 aux, 2 EMC, 1 phono input; 100 V/70 V/4–16 Ω line output and output; 2-band EQ 100 Hz/10 kHz; short-circuit, overload, and heat protection; brushed aluminum front panel; 19″, 2 U rack; 482 × 88 × 345 mm; 9.58 kg; 230 V AC power supply.