BST UPA40 - 100V 40W Line Mixer Amplifier

BST UPA40 – 40W 100V Line Mixer Amplifier

The BST UPA40 is a 100V line mixer amplifier with 40W of power, specifically designed for PA systems in small spaces such as small shops, offices, and classrooms. Its compact 1.5U chassis features a 5mm brushed aluminum front panel and aluminum knobs for a professional finish and rugged durability. It features two microphone inputs, one with +48V phantom power and automatic priority on Mic 1 to ensure critical announcements prevail over other sources. It also adds an auxiliary input and a phone input (EMC) with line mute, a two-band EQ (100Hz low and 10kHz high) for adjusting the clarity of voice and background music, and multiple protection circuits against short circuit, overload, and overtemperature. Its low-impedance (4–16 Ω), 70 V, and 100 V active outputs facilitate the connection of speakers at different distances and power levels, while the 100 Hz to 16 kHz frequency response guarantees faithful reproduction of vocal and musical signals. Measuring 360 × 66 × 270 mm and weighing just 3 kg, it integrates easily into a standard rack without taking up unnecessary space or adding significant load to the installation.

Main features

• Output power: 40 W at 100 V line.
• Inputs: 2x microphone (XLR/jack) with priority on Mic 1 and +48 V phantom power; 1x auxiliary; 1x phone (EMC) with mute.
• Active outputs: 4–16 Ω / 70 V / 100 V.
• 2-band equalizer: bass (100 Hz) and treble (10 kHz) ±10 dB.
• Frequency response: 100 Hz – 16 kHz.
• Protection circuits: short circuit, overload and over temperature.
• 5mm brushed aluminum front panel and aluminum buttons.
• 19″ rack format, 1.5 U; dimensions 360 × 66 × 270 mm; weight 3 kg.

Product benefits

• Compact and robust design: Easy integration into standard racks with professional aluminum finish.
• Priority and Clarity: Automatic phantom power and mute on Mic 1 ensure important messages always get through.
• Versatility of connections: Supports microphones, auxiliary players and emergency phones.
• Advanced Protection: Multiple internal circuits protect your equipment and speakers from power failures.
• Audio Quality: Adjustable equalization and wide frequency response for clear vocals and soft ambient music.

Use cases

Ideal for PA systems in retail stores, cafes, small classrooms, and offices; background music playback in compact environments; alarm systems; and priority call customer service.

Frequently Asked Questions

• Which speakers are compatible? Any speaker with 100V, 70V, or impedances between 4 and 16 Ω, respecting the maximum power rating.
• How do I activate Mic 1 priority? It automatically attenuates the other channels when a signal is detected on the Mic 1 input.
• Can I adjust the bass and treble while on stage? Yes, using the front-facing knobs on the two-band EQ.

Description for projects

Mixer amplifier 100 V, 40 W; inputs 2 mic (phantom +48 V on Mic 1), 1 aux, 1 phono EMC; outputs 4–16 Ω, 70 V, 100 V; 2-band EQ; response 100 Hz–16 kHz; short-circuit, overload and heat protection; brushed aluminium panel; 19″ rack, 1.5 U; 360 × 66 × 270 mm; weight 3 kg.