With the PS 130 1-channel Speaker Station, speech intelligibility is optimized though use of low-noise, high-speed op-amps, a speech presence filter, and a specially developed bridged headphone amplifier. The front panel incorporates a Volume (listen level) control; Talk and Call buttons; and trimmers for buzzer volume, speaker attenuation, and side tone. An input limiter allows close-up use of the microphone without overload and distortion. Loudspeaker dimming is automatic when the microphone is in use. A front-panel connector is provided for use of a handset or headset; microphone and speaker are disabled automatically. Communication is clear and comfortable even in high-noise environments. Intercom connector is on the side panel to accommodate surface mounting on a wall.