Power amplifier Behringer KM400 stereo — compact stereo power amp

Behringer KM400 is a compact stereo power amplifier designed to drive passive loudspeakers in small installations. As a stereo power amp, it supplies two independent channels of amplification with a layout suited to background music, small PA systems, rehearsal rooms and club areas. The unit integrates with AV systems through standard balanced and unbalanced inputs and delivers reliable audio power to connected speakers while keeping a compact footprint for tight rack or shelf spaces.

Advantages

The amplifier offers a compact form factor that saves space in racks and on shelves while providing separate left and right channels for stereo playback. Its straightforward front- and rear-panel controls and connectors allow quick integration into existing setups. Built-in protection circuitry helps safeguard the amplifier and speakers from overload and thermal stress, maintaining stable operation during continuous use. The unit’s power and channel separation make it suitable for clear background music and small-scale public-address applications.

Suitable for

• Background music in cafes, shops and restaurants
• Small PA systems for events and presentations
• Rehearsal rooms and practice spaces
• Club areas and compact DJ setups
• AV systems in conference rooms and classrooms

Key specifications

• Configuration: stereo two-channel power amplifier
• Intended load: passive loudspeakers
• Inputs: balanced and unbalanced audio inputs (line level)
• Controls: front-panel level controls for each channel
• Protection: overload and thermal protection circuitry
• Form factor: compact chassis suitable for rack or shelf mounting
• Use case: designed for small installations and medium SPL requirements

How to use

Connect line-level sources to the amplifier’s inputs using appropriate balanced or unbalanced cables, then connect passive loudspeakers to the speaker outputs following correct polarity and impedance guidelines. Set the channel level controls to a low position before powering on, then gradually increase to the required level while monitoring speaker response. Ensure adequate ventilation around the unit and avoid obstructing cooling vents to maintain stable thermal performance.

Usage recommendations

For reliable operation, match speaker impedance and power handling to the amplifier’s capabilities, use proper cable types for balanced/unbalanced connections, and allow space for ventilation. During setup, start with conservative levels to prevent sudden overloads and verify speaker wiring and placement for even coverage.