TOA L-11S T – 900 Series Line Matching Module

Product Overview

The TOA L-11S T is a 600-ohm transformer-balanced line matching module with a mute-receive function for the TOA 900 Series mixer-amplifiers. It interfaces 600-ohm balanced sources to a 900 Series chassis and lets the channel mute under priority paging. As a TOA 900 Series line matching module, the L-11S T suits telephone-paging interfaces and legacy balanced equipment that must duck for announcements. It wires through a removable terminal block for fast, serviceable field installation.

The L-11S T combines proper 600-ohm impedance matching with the priority muting that commercial paging systems depend on. Its line-matching transformer references 600 ohms, the standard impedance for telephone and broadcast-style interconnects, and provides galvanic isolation that breaks ground loops and rejects common-mode noise on long runs. The mute-receive function lets the channel be silenced automatically when a higher-priority source such as a paging microphone is keyed, so announcements are heard clearly over music or a remote feed. This is the behavior schools, retail, and transit facilities require for intelligible paging. The module installs into an open 900 Series slot, drawing power and routing from the host frame, and its removable terminal block speeds wiring and service. Typical sources include a telephone paging gateway, a 600-ohm feed from another zone, or a processor output that should duck under live pages. The result is a quiet, properly matched input that participates in the system's priority logic. For TOA-standardized installs, it is the matching module to choose when ducking matters.

Key Features

• 600-Ohm Line Matching — Interfaces classic 600-ohm balanced sources such as telephone-paging ports with correct impedance.
• Mute-Receive Function — Mutes the channel automatically when a higher-priority paging source is keyed for clear announcements.
• Transformer Isolation — Breaks ground loops and rejects common-mode noise for hum-free audio across long runs.
• 900 Series Plug-In Module — Installs into a TOA 900 Series mixer-amplifier slot and draws power and routing from the host frame.
• Removable Terminal Block — Speeds field wiring and lets technicians service the card without disturbing adjacent modules.