TOA AT-4120B-EB 120W 8-Step Attenuation 24V Override Volume Attenuator

PRODUCT OVERVIEW 

High-Power Volume Control Solution

The TOA AT-4120B-EB is a professional wall-mounted attenuator designed for precise volume control in 100V line public address and commercial audio systems. With a 120W power handling capacity, it is ideal for schools, offices, shopping centers, hotels, and other large-scale installations. The unit enables users to adjust speaker volume conveniently while maintaining consistent audio performance throughout the system.

Precise 8-Step Attenuation Control

Featuring an 8-step attenuation mechanism, the AT-4120B-EB delivers accurate volume adjustment with 3 dB increments between levels. This allows users to fine-tune audio output according to room requirements and listening preferences. The ergonomic control knob provides a comfortable grip, ensuring smooth operation and reliable performance during everyday use.

Emergency Override Function

A key feature of the AT-4120B-EB is its built-in 24V DC override relay, which ensures that emergency announcements are broadcast even when the volume control is turned down or switched off. The integrated red LED indicator clearly shows when the override function is active, making it a dependable solution for safety-critical public address systems.

Durable and Installation-Friendly Design

Constructed with a robust ABS resin control knob and cover panel, along with a surface-treated steel front plate, the attenuator is built for long-term reliability. The screw-type terminal block supports thicker cables ranging from 22 to 14 AWG, simplifying installation and ensuring secure connections. Its clip-on faceplate further enhances maintenance and installation convenience.Capacity