Product Overview
The TOA M-01ST microphone input module adds a transformer-balanced microphone input to any 900 Series mixer-amplifier or modular preamplifier. Built around a screw-terminal connector, this 900 series microphone input module suits permanent commercial installations where a paging mic, gooseneck, or other balanced source must be wired directly into the chassis. Switchable phantom power lets the module drive condenser microphones, while onboard gain and tone controls match levels to the rest of the system.
Product Description

The M-01ST plugs into a single module slot on a TOA 900 Series host such as the A-900 series mixer-amplifiers or M-900 modular preamplifier. Its transformer-balanced input rejects common-mode noise across long microphone cable runs, which makes it well suited to distributed audio and paging systems in larger buildings. The screw-terminal connector lets integrators terminate field wiring cleanly without soldering connectors, a practical advantage during rack assembly and service. Selectable phantom power supports both dynamic and condenser microphones from the same slot, and the gain trim plus tone control allow each input to be balanced against music and other program sources feeding the host. Because the module conditions the signal before it reaches the amplifier stage, it helps maintain consistent speech intelligibility in constant-voltage 70/100 V distribution systems. The M-01ST is a direct-fit upgrade or spare for systems already standardized on the 900 Series platform.
Key Features
- Transformer-Balanced Input — A balanced microphone input with transformer isolation rejects hum and ground-loop noise on the long cable runs typical of commercial paging systems.
- Screw-Terminal Connector — The terminal-block connector lets integrators land field microphone wiring directly and securely without additional adapters.
- Switchable Phantom Power — Onboard phantom power allows the module to drive condenser microphones as well as dynamic models from a single slot.
- Gain and Tone Controls — Front-accessible level and tone adjustment let the input be matched precisely to other sources in the host chassis.
- 900 Series Compatibility — The module installs in any standard 900 Series module slot for a clean, factory-supported integration.
Technical Specifications
| Module type | Microphone input module (900 Series) |
| Input | Transformer-balanced microphone input |
| Connector | Screw terminal (terminal block) |
| Phantom power | Provided (switchable) for condenser microphones |
| Controls | Gain and tone |
Specifications per the TOA M-01S datasheet.
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- Most in-stock orders placed Monday-Friday ship within 24-48 hours. General restrictions apply; please see our full shipping policy here.
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