TOA A-824D Digital Mixer Amplifier - 240W

TOA A-824D Specifications

Here's a polished rewrite:

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TOA A-824D Digital Mixer Amplifier – 240W, 8 Inputs, DSP & Network Control

The TOA A-824D is a professional 240-watt digital mixer amplifier engineered for demanding commercial audio installations requiring powerful output, advanced processing, and flexible remote management. Designed for corporate facilities, educational institutions, retail environments, hospitality venues, and multi-zone sound systems, the A-824D delivers twice the power of the A-812D while maintaining the same sophisticated feature set and intuitive network control.

Featuring eight flexible inputs with independent DSP processing, the A-824D excels in background music distribution, foreground audio reinforcement, multi-zone paging, and sound masking applications. Browser-based configuration enables complete remote system management from any networked device, eliminating costly service calls and enabling real-time adjustments from anywhere on your network. Two expansion module slots accommodate TOA's 900 Series modules for enhanced functionality, while dedicated Music On Hold (MOH) output ensures seamless telephone system integration.

Built on TOA's legacy of professional-grade reliability and backed by industry-leading support, the A-824D provides the processing power, connectivity, and control flexibility required for modern commercial audio systems—all in an elegant, rack-mountable chassis.

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Key Features

• 240W digital power amplification – High-efficiency Class D design delivers clean, powerful output
• 8 versatile inputs – Flexible MIC/LINE inputs with individual DSP processing per channel
• Advanced built-in DSP – Comprehensive EQ, dynamics, crossover, delay, and routing control
• Browser-based remote control – Configure and monitor via web interface from any device
• Network management ready – Adjust settings and monitor system status from anywhere
• Two 900 Series module slots – Expandable with optional TOA input/output and networking modules
• Music On Hold (MOH) output – Direct telephone system integration
• Multi-zone audio distribution – Independent routing and processing for multiple areas
• Dante network audio ready – Optional module enables low-latency digital audio networking
• Scene memory and recall – Store and instantly switch between custom configurations
• Scheduled automation – Program time-based volume changes, source selection, and events
• Priority paging with ducking – Automatic override for emergency announcements
• Intelligent feedback suppression – Eliminates feedback without affecting audio quality
• Real-time monitoring – Visual metering and status indicators via web interface
• Professional I/O options – Multiple input and output configurations for system flexibility
• Standard rack mounting – EIA-compliant 3U design for professional installations
• Enterprise-grade reliability – Built for 24/7 continuous operation in commercial environments

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Specifications

Power Output

• Rated Power: 240W total
• Amplifier Type: Class D digital switching amplifier
• THD+N: <0.1% at rated output (1 kHz)
• Frequency Response: 20 Hz – 20 kHz (±0.5 dB)
• S/N Ratio: >90 dB (A-weighted)
• Dynamic Range: >100 dB

Inputs (8 Total)

• Input Configuration: Switchable MIC/LINE per channel
• MIC Input:
  • Connector: Phoenix/Euroblock or XLR (model-dependent)
  • Sensitivity: -60 dBV to -20 dBV (adjustable)
  • Impedance: 2kΩ balanced
  • Phantom Power: 24V DC (switchable per input)
  • Max Input Level: -20 dBV
• LINE Input:
  • Sensitivity: -20 dBV to +10 dBV (adjustable)
  • Impedance: 10kΩ balanced/unbalanced
  • Max Input Level: +10 dBV
• Input Processing: Independent DSP per channel (EQ, compression, gate, delay)

Outputs

• Speaker Outputs:
  • Configurations: 100V/70V constant voltage or 4-8Ω low impedance
  • Connector: Phoenix/Euroblock screw terminals
  • Multiple zone outputs supported
• Line Outputs:
  • Type: Balanced line-level (XLR or Phoenix)
  • Level: Adjustable output level
  • Impedance: 600Ω balanced
• MOH (Music On Hold) Output:
  • Connector: RCA or Phoenix
  • Level: -10 dBV nominal
  • Impedance: 600Ω
• Zone Outputs: Configurable multi-zone routing with independent control

Digital Signal Processing (DSP)

• Parametric EQ:
  • Multi-band per input and output
  • Adjustable frequency, gain, and Q
• Dynamics Processing:
  • Compressor/limiter per input channel
  • Adjustable threshold, ratio, attack, release
  • Noise gate per input with adjustable threshold
• Crossover:
  • High-pass and low-pass filters
  • Butterworth, Linkwitz-Riley, Bessel filter types
  • Adjustable slope (6-48 dB/octave)
• Delay:
  • Up to 500ms per channel
  • For speaker alignment and zone synchronization
• Feedback Suppression:
  • Automatic notch filtering (up to 12 notches)
  • Fixed and dynamic modes
• Auto Gain Control (AGC): Maintains consistent output levels
• Ducking/Priority:
  • Automatic level reduction for paging
  • Adjustable depth and release time
• Mixing Matrix: Flexible signal routing and mixing

Network & Control

• Ethernet: 10/100 Mbps RJ-45 connection
• Control Interface: Browser-based HTML5 GUI
• System Requirements: Any modern web browser (Chrome, Firefox, Safari, Edge)
• Remote Access: Control from PC, tablet, or smartphone
• Network Configuration: DHCP or static IP assignment
• Monitoring Features:
  • Real-time input/output metering
  • System status and diagnostics
  • Temperature monitoring
  • Network status
• Automation:
  • Time-based scheduling (daily, weekly)
  • Event programming and triggers
• Scene Memory: Store and recall 100+ custom presets
• Security: Password protection with multiple user permission levels

Expansion & Integration

• Module Slots: 2 × 900 Series expansion slots
• Compatible TOA 900 Series Modules:
  • D-001T: Dante network audio module
  • D-002T: Additional analog input module
  • D-003T: Digital input/output module
  • D-004T: Contact closure/GPIO module
  • Additional I/O expansion modules
• External Control:
  • RS-232 serial control (optional)
  • GPIO contact closure inputs (with module)
  • Third-party control system integration
• Protocol Support: AMX, Crestron, Extron compatible (verify specific model)

Front Panel

• Backlit LCD display (system status, metering, menu navigation)
• Rotary encoder and navigation buttons
• Input level controls (optional, model-dependent)
• Source selection buttons
• Power ON/OFF switch
• LED indicators:
  • Power
  • Signal presence (per input)
  • Clip/overload warning
  • Network status
  • Module status

Protection Features

• Output short circuit protection with auto recovery
• Overload protection per channel
• Thermal protection with intelligent fan control
• DC offset detection and protection
• Soft-start circuitry to protect speakers
• Password-protected configuration lockout
• Over-voltage and under-voltage protection

Physical

• Dimensions: 19" × 5.25" × 12.6" (483 × 133 × 320 mm) – 3U rack height
• Weight: Approx. 17-20 lbs (8-9 kg)
• Mounting: Standard EIA 19" rack mount (3U)
• Construction: Heavy-duty steel chassis with forced-air cooling
• Cooling: Temperature-controlled variable-speed fan
• Finish: Professional black with silver accents

Power Requirements

• AC Input: 100-240V AC, 50/60 Hz (auto-switching)
• Power Consumption: 350W maximum
• Standby Power: <1W (Energy Star compliant)
• Inrush Current: <30A

Operating Conditions

• Operating Temperature: 32°F – 104°F (0°C – 40°C)
• Storage Temperature: -4°F – 122°F (-20°C – 50°C)
• Humidity: 90% RH or less (non-condensing)
• Altitude: Up to 2000m above sea level

Certifications & Compliance

• UL 60065 Listed
• cUL Listed (Canada)
• CE compliant (Europe)
• FCC Part 15 Class A
• RoHS compliant
• REACH compliant

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Applications

Corporate & Commercial:

• Conference centers and meeting rooms
• Office background music and paging
• Retail stores and shopping malls
• Hotels and convention centers
• Corporate training facilities

Education:

• School classrooms and lecture halls
• Cafeterias and gymnasiums
• Libraries and media centers
• Campus-wide paging and emergency notification
• Auditoriums and performing arts centers

Worship:

• Sanctuaries and worship halls
• Fellowship halls and multi-purpose rooms
• Overflow rooms and cry rooms
• Multi-campus installations with network control

Hospitality & Entertainment:

• Restaurants, bars, and nightclubs
• Fitness centers and wellness spas
• Country clubs and golf courses
• Casinos and gaming facilities
• Theme parks and attractions

Specialized Applications:

• Healthcare facilities and hospitals
• Transportation terminals (airports, train stations)
• Government and municipal buildings
• Museums and cultural centers
• Sound masking and speech privacy systems

Browser-Based Control System

The A-824D's advanced web interface provides unprecedented control and monitoring:

Key Benefits:

• Zero software installation – Access from any device with a standard web browser
• Remote management – Configure and monitor from anywhere on the network
• Multi-user capability – Multiple administrators with customizable permission levels
• Intuitive visual interface – Drag-and-drop routing, graphical EQ, real-time metering
• Mobile optimization – Full functionality on smartphones and tablets
• Secure authentication – SSL encryption and password protection
• System diagnostics – Built-in troubleshooting tools and status monitoring

Control Functions:

• Input gain and routing
• Output zone assignment
• DSP parameter adjustment (EQ, dynamics, delay)
• Scene recall and management
• Scheduled event programming
• System monitoring and diagnostics
• Firmware updates via network

Choose the A-824D if you need:

• Higher power output for larger spaces
• More headroom for demanding applications
• Greater speaker quantity and distribution
• Future-proof capacity for expansion

System Integration & Expansion

Dante Audio Networking (Optional Module):

• Low-latency digital audio over standard Ethernet
• Scalable to hundreds of channels
• Long cable runs without signal degradation
• Integration with Dante-enabled devices network-wide

Third-Party Control Integration:

• Compatible with leading control systems (AMX, Crestron, Extron)
• RS-232 and IP control protocols
• GPIO triggers for automation
• API documentation available for custom integration

Multi-Unit Linking:

• Link multiple A-824D units for larger installations
• Synchronized control and monitoring
• Unified browser interface for entire system
• Centralized scene and schedule management

Why Choose the TOA A-824D?

• Proven reliability – TOA's decades of commercial audio expertise
• Powerful output – 240W handles demanding applications with headroom
• Advanced DSP – Professional-grade processing in an affordable package
• Network-ready – Modern IP control eliminates proprietary control hardware
• Flexible expansion – Modular design grows with your needs
• Intuitive operation – Browser control simplifies training and daily use
• Global support – Backed by TOA's worldwide service network
• Excellent ROI – Enterprise features at a competitive price

What's in the Box

• TOA A-824D digital mixer amplifier
• IEC AC power cord
• Rack mount brackets and hardware
• Phoenix/Euroblock connector plugs (for inputs/outputs)
• Ethernet cable (CAT5e)
• User manual (printed and digital)
• Quick start guide
• Warranty registration card