The TOA AN-001T is a professional 2-channel ambient noise detection module engineered to provide automatic volume compensation in dynamic acoustic environments. Designed exclusively for TOA's 9000 Series mixer/amplifiers (A-9060DHM2, A-9120DHM2, and compatible models), the AN-001T continuously monitors environmental noise levels and intelligently adjusts audio output to maintain optimal speech intelligibility and listening comfort without manual intervention.
Ideal for installations in airports, transportation terminals, shopping centers, educational facilities, restaurants, manufacturing plants, and any environment subject to varying background noise levels, the AN-001T ensures paging announcements and background music remain clearly audible during noisy periods while preventing excessive volume during quieter times. This intelligent automation improves the user experience, reduces complaints, and eliminates the need for staff to constantly adjust volume levels throughout the day.
Each channel features versatile input configuration supporting both microphone (-60 dB) and line-level (-10 dB) sources with 9-step adjustable gain, plus switchable +24V phantom power for condenser microphones. The dual-channel design enables independent noise sensing in two separate zones or areas, providing precise localized control for complex multi-zone systems.
TOA AN-001T Key Features
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Dual-channel ambient noise detection – Independent sensing for two zones or areas
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Automatic volume compensation – Adjusts output based on real-time environmental noise
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9000 Series compatibility – Plug-in module for A-9060DHM2, A-9120DHM2, and compatible units
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Flexible input configuration – Switchable MIC (-60 dB) or LINE (-10 dB) per channel
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9-step adjustable gain – Fine-tune sensitivity for optimal performance
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Built-in phantom power – +24V per channel for condenser microphones
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Independent channel control – Configure each channel separately for different zones
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Real-time response – Immediate adjustment to changing noise conditions
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Maintains speech intelligibility – Ensures announcements cut through background noise
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Prevents over-amplification – Reduces volume during quiet periods
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Reduces listener fatigue – Maintains comfortable listening levels
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Eliminates manual adjustment – Set-and-forget automation
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Professional-grade components – TOA quality for reliable long-term operation
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Easy installation – Plug-in design simplifies integration
TOA AN-001T Specifications
General
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Type: 2-channel ambient noise sensor/input module
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Compatibility: TOA 9000 Series mixer/amplifiers (A-9060DHM2, A-9120DHM2, D-9 series)
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Channels: 2 independent channels
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Installation: Internal plug-in module (occupies 1 module slot)
Input Section (Per Channel)
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Input Types: Switchable MIC or LINE
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MIC Input:
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Connector: Phoenix/Euroblock or XLR (verify model)
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Sensitivity: -60 dBV (1 mV nominal)
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Impedance: 2kΩ balanced
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Max Input Level: -20 dBV
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Phantom Power: +24V DC (switchable per channel)
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LINE Input:
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Sensitivity: -10 dBV (316 mV nominal)
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Impedance: 10kΩ unbalanced
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Max Input Level: +10 dBV
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Gain Adjustment: 9 steps (adjustable via DIP switches or front panel)
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Frequency Response: 100 Hz – 10 kHz (optimized for speech/noise detection)
Ambient Noise Detection
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Detection Method: RMS (Root Mean Square) level monitoring
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Response Time: Adjustable (fast, medium, slow—verify exact options)
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Detection Range: Adjustable sensitivity threshold
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Control Range: Typically 0-20 dB volume adjustment (verify spec)
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Attack Time: Fast response to noise increases
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Release Time: Gradual return to baseline when noise decreases
Phantom Power
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Voltage: +24V DC per channel
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Current Capacity: 10 mA per channel (typical for condenser mics)
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Switching: Individual on/off per channel (DIP switch or jumper)
Configuration & Controls
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Gain Settings: 9-step adjustable (DIP switches on module)
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Input Select: MIC/LINE switch per channel
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Phantom Power: ON/OFF switch per channel
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Sensitivity Adjustment: Threshold control for noise detection
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Response Time: Adjustable attack/release characteristics (if available)
Physical
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Form Factor: Standard TOA plug-in module
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Dimensions: Approx. 5.9" × 4.3" × 1.2" (150 × 110 × 30 mm)
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Weight: Approx. 0.4 lbs (200 g)
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Connectors: Phoenix/Euroblock screw terminals or XLR (model-dependent)
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Module Slot: Occupies 1 slot in 9000 Series mixer/amplifier
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Installation: Hot-swappable: No (power off host unit before installation)
Power Requirements
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Power Source: Supplied by host 9000 Series mixer/amplifier
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Consumption: <5W per module (typical)
Operating Conditions
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Operating Temperature: 32°F – 104°F (0°C – 40°C)
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Storage Temperature: -4°F – 122°F (-20°C – 50°C)
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Humidity: 90% RH or less (non-condensing)
Certifications
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Compliance: Meets TOA 9000 Series module standards
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Safety: UL/cUL recognized component
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RoHS: Compliant
How Ambient Noise Compensation Works
The Problem: In dynamic environments, background noise levels fluctuate throughout the day:
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Airports: Quiet during off-hours, noisy during peak travel
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Shopping centers: Low ambient noise early morning, high during busy periods
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Schools: Quiet classrooms, noisy hallways during class changes
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Restaurants: Variable noise from customer traffic and kitchen activity
Traditional fixed-volume systems either:
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Play too loud during quiet periods (annoying, wastes energy)
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Play too soft during noisy periods (unintelligible announcements)
The Solution: The AN-001T continuously monitors ambient noise through dedicated microphone or line-level sensor inputs and automatically adjusts the system's output volume to maintain consistent audibility:
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Noise Detection: Module monitors environmental noise via microphone placed in representative location
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Level Analysis: DSP calculates real-time noise floor using RMS measurement
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Automatic Adjustment: System increases volume when noise rises, decreases when noise falls
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Intelligent Limiting: Prevents over-compensation to avoid excessive volume
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Smooth Transitions: Gradual volume changes prevent jarring shifts
Result: Speech and music remain clearly audible and comfortable regardless of environmental conditions.
Applications
Transportation:
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Airports and terminals (flight announcements, paging)
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Train and bus stations
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Subway platforms
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Parking structures
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Ferry terminals
Retail & Commercial:
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Shopping malls and centers
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Department stores
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Grocery stores
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Restaurants and food courts
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Casinos
Education:
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School hallways and corridors
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Cafeterias and gymnasiums
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Libraries (maintain quiet atmosphere)
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Campus outdoor areas
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Student centers
Industrial:
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Manufacturing facilities
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Warehouses and distribution centers
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Food processing plants
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Assembly lines
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Loading docks
Public Spaces:
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Government buildings
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Convention centers
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Museums and galleries
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Sports facilities
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Theme parks
Healthcare:
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Hospital corridors and waiting rooms
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Emergency rooms (variable noise)
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Cafeterias
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Parking structures
Frequently Asked Questions
Q: How many AN-001T modules can I install in one mixer/amplifier? A: Each AN-001T occupies one module slot. The A-9060DHM2 and A-9120DHM2 have 8 total slots, so theoretically you could install up to 8 modules for 16 independent ANC channels. Practical limits depend on your specific system configuration.
Q: What type of microphone should I use for noise sensing? A: We recommend omnidirectional condenser microphones with +24V phantom power capability. These provide accurate ambient noise detection across the frequency spectrum. Avoid highly directional mics which may miss representative noise levels.
Q: Can I use a line-level signal instead of a microphone? A: Yes, each channel can accept line-level input (-10 dB). This is useful if you already have ambient noise monitoring equipment or want to integrate with building management systems.
Q: How quickly does the system respond to noise changes? A: Response time is configurable. Fast attack ensures announcements are immediately audible when noise rises. Slower release prevents pumping effects when noise decreases. Typical attack: <1 second; release: 3-10 seconds (adjustable).
Q: Will this work with my existing TOA mixer/amplifier? A: The AN-001T is designed for 9000 Series mixer/amplifiers (A-9060DHM2, A-9120DHM2, and compatible models). Verify compatibility with your specific model before ordering.
Q: Does ambient noise control affect all zones equally? A: No—each channel of the AN-001T controls specific zones independently. You assign which zones each ANC channel affects through the host mixer/amplifier's routing configuration.
Q: Can I bypass the ANC function if needed? A: Yes, the host mixer/amplifier allows you to enable/disable ANC per zone or globally through front panel controls or RS-232C commands.
