TOA U-12S – 900 Series Line Input Module

Product Overview

The TOA U-12S line input module brings an unbalanced, line-level source into a 900 Series mixer/amplifier, making it a flexible choice for background music and paging systems that combine program audio with announcements. This 900 Series plug-in module connects tuners, media players, CD players, and computer sound cards through a removable terminal block, and its variable mute-receive depth lets program audio duck under priority pages rather than cut out entirely. As an unbalanced line input module with adjustable ducking, it supports distributed audio designs where music must yield smoothly to voice. Gain control lets an installer set a consistent level across mixed sources.

Product Description

The U-12S installs in a 900 Series module slot and is powered by the host frame's 24 V DC supply, so no external power is needed. Its 220 kohm unbalanced input is designed for adjacent line-level sources within roughly 15 feet of the host unit, which suits equipment-rack and credenza installations. The module responds to the mixer's mute bus, triggered by a mute-send module or a simple switch closure, allowing paging and emergency messages to take priority. Because the mute-receive depth is adjustable from 0 to 60 dB, an integrator can choose between gentle ducking for background music or full attenuation for clear announcements. A gain range of -30 to 0 dB lets the input be matched to consumer and professional source levels alike. Connection is through a removable 3-pole terminal block for fast wiring and service. The module shares the 900 Series format, so it can sit alongside microphone, telephone paging, and processing modules in the same frame. This makes the U-12S a dependable building block for retail, hospitality, and office distributed audio systems.

Key Features

• Unbalanced Line Input — A 220 kohm input accepts line-level sources such as tuners, media players, and computer audio outputs.
• Variable Mute-Receive Depth — Adjustable 0 to 60 dB attenuation lets program audio duck smoothly under priority pages instead of muting fully.
• Mute Bus Response — The module reacts to a mute-send module or switch closure so announcements automatically take priority over music.
• Adjustable Gain — A -30 to 0 dB gain range matches consumer and professional source levels for consistent system balance.
• Removable Terminal Block — The pluggable 3-pole connector simplifies installation and field service in equipment racks.
• 900 Series Compatibility — The standard module format installs in compatible TOA 900 Series mixer/amplifiers for scalable system design.

Technical Specifications