TOA TS-690 Conference Central Unit

TOA TS-690 Conference Central Unit — The Brain Behind Every Professional Conference System

A conference microphone system without a reliable central unit is like a boardroom without a chairperson — individual parts exist, but nothing coordinates them into a coherent whole. Every professional wired conference installation needs one piece of hardware that ties everything together: powers the microphones, manages the floor, controls who speaks, and captures the audio for the record. For small-to-medium scale conference environments across Bangladesh, that piece of hardware has a very clear name — the TOA TS-690 Conference Central Unit.

The TS-690 is the Central Unit for TOA’s TS-690 Series Conference System. Through its line connection terminals, it connects directly to the TS-691L Chairman Unit and TS-692L Delegate Units, forming a complete, fully operational wired conference system tailored precisely for corporate boardrooms, government meeting rooms, university senate halls, NGO conference facilities, and hotel seminar rooms throughout Bangladesh.

What makes the TS-690 particularly well-suited for the Bangladeshi professional environment is its combination of technical capability and operational simplicity. This central unit can connect up to 24 conference units, making it the most ideal conference setup for small to medium scale applications — which describes the overwhelming majority of conference room installations in Dhaka, Chittagong, Sylhet, and beyond. It’s not over-engineered for spaces that don’t need it, and it’s not underpowered for rooms that do.

The central unit features a built-in test function that enables easy confirmation of the connection status of all connected units by simultaneously activating all microphones — a practical convenience during system commissioning and pre-meeting checks that saves considerable time for AV installers and IT administrators. Add a recording output for archiving meeting proceedings, selectable MIC or AUX external input, and adjustable simultaneous delegate speaker restriction, and the TS-690 covers every operational scenario a professional conference environment is likely to encounter.

With the use of an optional rack mounting bracket, the TS-690 can be mounted in an EIA Standard equipment rack, occupying 2 unit size — a clean, professional installation option for dedicated AV racks in permanent conference room setups and integrated control rooms.

TOA TS-690 Specifications

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Why You Buy TOA TS-690 Conference Central Unit

• Single Hub That Powers, Controls, and Coordinates Up to 24 Conference Units — No Separate Amplifier Needed — For organizations in Bangladesh building or upgrading a conference room audio system, the total system cost and component count matters. The TS-690 eliminates the need for a separate power supply, separate microphone controller, and separate mixer for the conference chain — its rated output of 36V DC at 480mA powers all connected TS-691L and TS-692L units simultaneously through the loop cabling, while the MIC/AUX input and recording output handle external audio integration in the same unit. One device, one installation, one point of management — that simplicity directly reduces both procurement cost and long-term maintenance complexity for boardrooms, government offices, and institutional meeting halls across Bangladesh.
• Intelligent Floor Management Controls — Speaker Restriction and Auto Mic-Off Maintain Meeting Discipline Automatically — Uncontrolled conference audio — multiple delegates speaking simultaneously, microphones left open after participants finish speaking, or prolonged silence holding the floor open — is one of the most common complaints from conference room users in Bangladesh. The TS-690 addresses this through two key control mechanisms: a speaker restriction setting that limits simultaneously active delegate microphones to 0, 1, 2, or 3 at any given time, and an automatic mic-off function that can be set to deactivate an open microphone after 30 seconds of inactivity. Together, these features enforce procedural discipline on the audio layer itself — even before the chairperson needs to press the priority button — keeping proceedings structured and recordings clean.
• Built-In Recording Output + Test Function — Professional Accountability Built Into the Hardware — For government institutions, legal chambers, corporate boards, and academic bodies in Bangladesh where meeting minutes and audio records carry procedural or legal significance, the TS-690’s recording output is not a luxury feature — it’s a necessity. The unbalanced RCA recording output delivers clean, mixed conference audio to any external recording device, while the test function allows the entire connected system to be verified in minutes before any meeting begins. No surprises mid-session, no scrambling to fix a dead microphone position in front of a room full of delegates — just confirmed, reliable operation from the moment the first participant sits down.

FAQ

Q1: Can the TOA TS-690 Central Unit be expanded beyond 24 conference positions for larger venues in Bangladesh?

Single TS-690 Central Unit supports a maximum of 24 chairman and delegate units combined per installation. For conference halls in Bangladesh requiring more than 24 speaking positions — such as large assembly rooms, parliamentary chambers, or multi-table seminar setups — the system is expandable by connecting multiple central units together, with the broader TOA conference platform supporting up to 192 units by linking 3 central units in a coordinated configuration. For venues with 24 or fewer positions, a single TS-690 handles everything without any expansion hardware — making it the right-sized, cost-efficient solution for the vast majority of conference room installations across Bangladesh.

Q2: What external devices can be connected to the TOA TS-690 recording output?

Recording output on the TS-690 is a -20dB, 10kΩ unbalanced RCA jack that delivers a clean mix of all active conference microphone audio to any compatible recording device. In practical terms for Bangladesh conference room installations, this means the output can feed directly into a digital audio recorder, a laptop running recording software, a mixing console for simultaneous PA reinforcement, or a video conferencing system’s audio input for hybrid meeting setups. The signal level and impedance are standard enough to interface with virtually any consumer or professional recording device without additional preamps or adapters in most configurations.

Q3: Does the TOA TS-690 require any software or configuration interface to operate?

No — the TS-690 is entirely hardware-controlled with no software dependency, computer interface, or network connectivity required. The system operates as a true plug-and-play conference platform where the central unit manages all connected chairman and delegate units through physical controls on the front panel, including the input selector switch, speaker restriction dial, and automatic mic-off toggle. This hardware-only operation is a meaningful advantage for conference rooms in Bangladesh where dedicated IT support may not always be available during meetings — system administrators and even non-technical venue staff can verify connections using the test function and manage the session confidently without any technical training beyond initial setup.