Digital Mixer Amplifier – A-824D

The TOA A‑824D Digital Mixer Amplifier from the 800D Series delivers powerful, versatile audio performance for paging, announcements, and background music applications. Designed for efficiency and reliability, it features Class D amplification, onboard DSP, flexible input options, and advanced control capabilities—making it ideal for schools, offices, supermarkets, and commercial facilities.

Key Features

• High-Efficiency Class D Amplification: Provides powerful output with reduced power consumption.
• Auto Gain Control: Maintains consistent microphone levels for clear and stable audio.
• Integrated DSP: Includes Dynamic Feedback Filters, 3‑band parametric EQ, and input tone controls.
• Flexible Input Configuration: 4 mic inputs, 2 aux inputs, and 2 modular slots for 900 Series modules.
• Assignable Input Priorities: Allows paging to override background audio when needed.
• Selectable Pre‑Announce Chime: 1‑note, 2‑note, or 4‑note ascending.
• Advanced Monitoring: Log data support and IP protocol connectivity.
• Dual Input Buses: AUDIO and DUCK buses for automatic ducking and routing.

Specifications

Power

• Power Source: 120 V AC, 60 Hz
• Rated Output: 240 W
• Power Consumption: 317 W (rated), 62 W (UL62368), 200 mA or less (power switch OFF)

Audio Performance

• Frequency Response: 50 Hz – 20 kHz ±3 dB (1/8 rated output)
• Distortion: 1% or less at 1 kHz, rated power
• Tone Control: Bass ±10 dB at 100 Hz, Treble ±10 dB at 10 kHz
• Signal to Noise Ratio:
  • 88 dB or more (Master volume: min)
  • 76 dB or more (Master volume: max)
  • 55 dB or more (Inputs 1–6, A‑weighted)

Audio Inputs

• Input 1 & 2: –60 dB (MIC) / –20 dB (LINE) selectable, 600 Ω, electronically balanced; 24V phantom power (switchable)
• Input 3 & 4: –60 dB, 600 Ω, electronically balanced; 24V phantom power (switchable)
• Input 5 & 6:
  • MIC: –60 dB, 600 Ω, balanced
  • LINE: –20 dB, 10 kΩ, unbalanced RCA (x2)
• Module 1 & 2: –20 dB, 10 kΩ
• Power Amp In: 0 dB, 600 Ω, unbalanced RCA

Input Bus

• Inputs 1–4: AUDIO
• Inputs 5–6: AUDIO / DUCK selectable
• Modules 1–2: AUDIO / DUCK selectable

Audio Outputs

• Speaker Out: 70 V line / 21 Ω or 4–16 Ω, removable terminal block
• REC Out: 0 dB, 600 Ω, RCA (x2)
• Pre Amp Out: 0 dB, 600 Ω, RCA

Control Inputs & Outputs

• Control Input: 4 channels, no‑voltage contact input (35 V DC max)
• Remote Volume: Terminal block (4‑pin)
• Power Remote Output: Open collector, 30 V DC max, 25 mA
• Emergency Output: Open collector, 30 V DC max, 25 mA

Chime & Indicators

• Chime: 1‑note, 2‑note, 4‑note ascending, or none
• Indicators: 5‑point LED meter, Power, LAN, Priority, Emergency, Thermal, Over‑current, CPU RUN, Error

Environmental

• Operating Temperature: –10°C to +40°C (14°F to 104°F)
• Operating Humidity: Up to 85% RH (no condensation)

Construction

• Panel: ABS resin, black
• Case: Surface‑treated steel, black
• Dimensions: 420 × 96.1 × 313.1 mm (16.54" × 3.78" × 12.33")
• Weight: 5.2 kg (11.46 lb)

Included Accessories

• Power cord (2 m)
• Audio input terminal plugs (3‑pin × 6)
• Control input terminal plugs (4‑pin × 2)
• Remote control terminal plugs (4‑pin × 2)
• Speaker output terminal plug (3‑pin × 1)
• Volume control covers (×4)
• Rack mounting brackets (×2)
• M4 screws (×4) & washers (×4)