VARIODYN ONE 585031 AMP 4XD250B 4x250W Amplifier EN 54-16

The Voice Alarm AMP 4XD250B (part number 585031) is a four-channel Class D direct-drive power amplifier designed for the VARIODYN ONE system within the V1 Voice Rack range. It delivers four independent 250 W output channels, with one channel configurable as a backup. Engineered for critical voice-alarm installations, it operates from a 230 V AC supply (±10% / -5%) or a 21.5–28.5 V DC emergency supply, drawing 2.2 A AC and 18.6 A DC under rated conditions. The unit is approved to EN 54-4 and EN 54-16 standards, helping to ensure compliance with fire detection and voice alarm system requirements.

It features a system input impedance of 20 kOhm, an input level of 0 dBu, and a distortion factor of ≤0.3% at 1 kHz, supporting reliable signal transmission across a 50 Hz to 60 Hz range. Accessory compatibility includes various amplifier output and backup cables (SKUs 585301–585307), with physical wiring details referenced in the installation manual. Efficiency is specified as less than 80%, and the amplifier can draw up to 53.5 A under 1 kHz sine wave conditions at 24 V DC for one minute. This model is defined by its multi-channel backup flexibility within the VARIODYN ONE ecosystem.