The TOA A-824D Digital Mixer Amplifier is a professional 240-watt Class D mixer amplifier designed for commercial paging, background music, and public address systems. Combining flexible audio inputs, built-in digital signal processing (DSP), and network-based configuration, the A-824D provides reliable sound reinforcement for schools, offices, retail stores, restaurants, and other commercial facilities.
Part of TOA's 800D Series, the A-824D features six built-in audio inputs and two expansion slots for compatible TOA 900 Series modules. Its integrated DSP includes automatic gain control, dynamic feedback filtering, speaker equalization, and input tone adjustment, helping installers optimize speech clarity and music reproduction.
The amplifier supports both 70V distributed speaker systems and 4–16-ohm low-impedance speaker connections, making it suitable for a variety of commercial audio installations. Priority paging, adjustable background music ducking, and selectable announcement chimes provide additional flexibility for facilities requiring clear communication alongside everyday music playback.
With browser-based configuration, remote volume control capabilities, and a compact rack-mountable design, the TOA A-824D offers an integrated solution for commercial sound systems that need dependable amplification and straightforward management.
Advanced DSP for Clear Paging and Background Music
The A-824D incorporates digital signal processing to help installers achieve consistent audio performance without requiring a separate external processor for basic system adjustments.
Its onboard processing includes dynamic feedback filters, three bands of parametric speaker equalization, input tone controls, and automatic gain control for microphone inputs.
These features are particularly valuable in facilities where paging microphones and background music sources share the same speaker system.
For example, a retail store can play background music throughout the day while allowing authorized paging announcements to take priority when needed.
Flexible Inputs and TOA 900 Series Expansion
The TOA A-824D accommodates microphones, line-level audio sources, and optional expansion modules.
Its input configuration includes:
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Inputs 1–2: Selectable microphone or line-level inputs.
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Inputs 3–4: Dedicated balanced microphone inputs.
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Inputs 5–6: Selectable microphone inputs or auxiliary line inputs using RCA connections.
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Two module slots: Support compatible TOA 900 Series expansion modules.
Inputs 1–4 provide switchable 24V phantom power for compatible microphones.
This arrangement allows installers to connect paging microphones, music players, and other audio equipment while retaining expansion flexibility for future requirements.
Priority Paging and Automatic Music Ducking
The A-824D is designed for applications where announcements must remain intelligible over background music.
Its configurable priority functions allow designated audio sources to take precedence over lower-priority sources.
When properly configured, the amplifier can automatically reduce background music levels during paging announcements and restore normal playback afterward.
A built-in announcement chime offers selectable one-note, two-note, and ascending four-note patterns. The chime can also be disabled when not required.
These capabilities make the amplifier well suited for schools, offices, supermarkets, and other facilities combining paging and music.
Network Configuration and Remote Control
The TOA A-824D includes network connectivity for browser-based configuration and system management.
Authorized personnel can use a connected computer and web browser to access supported settings, including input priorities, audio adjustments, network configuration, and system status.
Remote volume control connections provide additional installation flexibility when volume adjustments are needed away from the amplifier.
This approach simplifies system setup and allows installers to adjust supported parameters without relying exclusively on front-panel controls.
TOA A-824D Key Features
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240W rated output: Class D amplification for commercial paging and background music.
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70V or low-impedance operation: Selectable 70V distributed audio or 4–16-ohm speaker output.
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Six built-in audio inputs: Flexible microphone and auxiliary source connections.
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Two TOA 900 Series module slots: Expand input capabilities using compatible optional modules.
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Built-in DSP: Dynamic feedback filtering, three-band parametric speaker EQ, and input tone adjustment.
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Automatic gain control: Helps manage microphone input levels.
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Assignable input priorities: Supports paging and background music applications.
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Music ducking: Reduces lower-priority audio during announcements.
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Selectable announcement chime: One-note, two-note, or ascending four-note options.
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Browser-based configuration: Network access to supported settings and status information.
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24V phantom power: Switchable on microphone inputs 1–4.
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Remote volume control connections: Supports compatible external volume control arrangements.
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Rack-mountable construction: Rack-mounting brackets are included.
TOA A-824D Technical Specifications
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Specification
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TOA A-824D
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Product Type
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Digital Mixer Amplifier
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Series
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TOA 800D
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Amplifier Technology
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Class D
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Rated Output Power
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240W
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Speaker Output
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70V line / 21 ohms or 4–16 ohms
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Built-in Audio Inputs
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6
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Expansion Slots
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2 TOA 900 Series module slots
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Microphone Phantom Power
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24V DC, switchable on inputs 1–4
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Frequency Response
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50 Hz–20 kHz ±3 dB
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Distortion
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1% or less at 1 kHz, rated output
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Bass Control
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±10 dB at 100 Hz
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Treble Control
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±10 dB at 10 kHz
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DSP
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Dynamic feedback filters, speaker EQ, input tone controls
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Speaker Equalization
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3-band parametric EQ
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Automatic Gain Control
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Microphone inputs
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Paging Priority
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Assignable
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Announcement Chime
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1-note, 2-note, ascending 4-note, or off
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Recording Output
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RCA
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Preamp Output
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RCA
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Power Amplifier Input
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RCA
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Network Control
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Browser-based configuration
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AC Power
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120V AC, 60 Hz
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Power Consumption
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317W at rated output
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Dimensions
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16.54" W × 3.78" H × 12.33" D
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Weight
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11.46 lb (5.2 kg)
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Operating Temperature
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14°F–104°F
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Finish
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Black
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Rack Mounting
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Brackets included
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Specifications are based on TOA's published A-824D 3CU documentation.
Typical Applications
Schools and Educational Facilities
The A-824D supports classroom announcements, administrative paging, and background music in cafeterias, libraries, and common areas.
Its priority controls help ensure that designated announcements can override lower-priority audio sources.
Retail Stores and Supermarkets
Commercial facilities can use the amplifier to distribute background music while maintaining paging capabilities for customer assistance and staff announcements.
Automatic ducking helps keep announcements intelligible.
Offices and Corporate Facilities
The A-824D is suitable for reception areas, offices, meeting facilities, and shared commercial spaces requiring integrated music and paging.
Restaurants and Hospitality
Restaurants, hotels, and hospitality venues can use the amplifier for background music and general announcements through compatible commercial speaker systems.
Houses of Worship and Community Facilities
The amplifier can support speech reinforcement, background music, and announcements in meeting rooms, fellowship areas, and other shared spaces.
Installation and System Compatibility
The TOA A-824D can operate with compatible 70V commercial speakers or low-impedance speakers within its specified 4–16-ohm operating range.
For 70V installations, the combined speaker transformer tap settings must remain within the amplifier's available power capacity.
The amplifier also provides recording and preamplifier outputs for integration with compatible external audio equipment.
Optional TOA 900 Series modules allow installers to expand the system according to application requirements.
Important: The A-824D provides a selectable speaker output configuration; it is not an independently controlled multizone amplifier.
Why Buy the TOA A-824D from Audio Supply?
At Audio Supply, we understand that selecting the right commercial amplifier involves more than comparing wattage ratings.
The TOA A-824D combines 240 watts of amplification, built-in DSP, priority paging, and flexible input options in a single unit designed for professional audio installations.
Whether you're replacing an existing paging amplifier or planning a new commercial background music system, Audio Supply can help you identify compatible equipment and determine which products best fit your application.
Need a Compatible Commercial Speaker System?
The TOA A-824D supports 70V distributed speaker systems as well as compatible low-impedance speakers.
Audio Supply carries professional audio equipment for paging, background music, and commercial sound installations.
Contact Audio Supply for assistance selecting compatible speakers, microphones, and other system components for your project.
