TOA U-11S T – Unbalanced Line Input Module

Product Overview

The TOA U-11S T is a plug-in unbalanced line input module that adds a line-level source to TOA 900 Series mixer-amplifiers and compatible chassis. It accepts tuners, media players, and mixers through a removable terminal block, making it a clean choice for fixed-install background music and paging systems. Built-in mute-receive lets the channel duck automatically under live announcements, while a front gain control matches level to the rest of the system. It is a core building block for commercial distributed audio.

Product Description

The U-11S T installs into an open module slot on a TOA 900 Series host and draws its 24 V DC power from the main frame. It is designed for adjacent line-level sources located within roughly 15 feet of the host unit, where an unbalanced connection is practical. The removable 3-pole terminal block makes field wiring straightforward and lets integrators pre-terminate cable on the bench. With a 220 kΩ input impedance, the module bridges most consumer and prosumer line outputs without loading them. The mute-receive function responds to the host mute bus, ducking background music under live pages so announcements stay intelligible. Adjustable mute depth allows partial ducking rather than a full cut, which suits retail and hospitality background-music systems. Gain is adjustable from -30 dB to 0 dB so the source matches microphone and other inputs in the same chassis. Frequency response runs 20 Hz to 20 kHz, keeping music playback full-range across the distributed audio system.

Key Features

• Removable terminal block — The 3-pole pluggable connector lets installers terminate and swap wiring quickly during commissioning and service.
• Mute-receive ducking — The module lowers its level on the host mute bus so live pages take priority over program audio.
• Adjustable mute depth — Integrators can set partial ducking instead of full muting to keep music present beneath announcements.
• 220 kΩ unbalanced input — The high input impedance bridges consumer and prosumer line sources without loading their outputs.
• Front-panel gain control — A -30 dB to 0 dB range matches the source level to other inputs in the same 900 Series chassis.
• Frame-powered design — The module draws 24 V DC from the host unit, so no separate power supply is required.

Technical Specifications

Specifications per the TOA datasheet.