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Toa Electronics A-824D Digital Mixer/Amplifier (1 x 240W, 4 Ohms / 70V)

BH #TOA824D • MFR #A-824D
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Toa Electronics A-824D Digital Mixer/Amplifier (1 x 240W, 4 Ohms / 70V)
Key Features
  • Lightweight Digital Power Amplifier
  • 4 Mic/Line Inputs + 2 Aux Inputs
  • Two 900-Series Module Slots
  • Control Input for Emergency / Priority
System installers in search of a quality installation mixer / amplifier will be impressed with the TOA Electronics A-824D, a flexible six-channel mixer / 240W amplifier that's ideal for paging announcements and BGM applications in schools, offices, and supermarkets. The A-824D is equipped with four mic/line inputs, two auxiliary inputs, and two 900-Series module slots. The amplifier offers a single speaker output that's switchable between 4 ohms and 70V operation. The integrated Power Factor Correction (PFC) circuit prevents damage from faulty power. The unit offers several functions, including volume control, priority, chime, and remote confirmation. In addition, it is equipped with a 2-channel input Bus of Audio and Duck, and the signal processing function. The A-824D includes a power cord, several block terminal plugs, a volume control cover, and rackmount hardware.
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Toa Electronics A-824D Overview

System installers in search of a quality installation mixer / amplifier will be impressed with the TOA Electronics A-824D, a flexible six-channel mixer / 240W amplifier that's ideal for paging announcements and BGM applications in schools, offices, and supermarkets. The A-824D is equipped with four mic/line inputs, two auxiliary inputs, and two 900-Series module slots. The amplifier offers a single speaker output that's switchable between 4 ohms and 70V operation. The integrated Power Factor Correction (PFC) circuit prevents damage from faulty power. The unit offers several functions, including volume control, priority, chime, and remote confirmation. In addition, it is equipped with a 2-channel input Bus of Audio and Duck, and the signal processing function. The A-824D includes a power cord, several block terminal plugs, a volume control cover, and rackmount hardware.

Note:
900-Series Modules sold separately.
  • 240W power amplifier output
  • Lightweight owing to the built-in digital power amplifier unit
  • Emergency broadcast and priority broadcast activated by way of the control input (contact)
  • Voice detection function that allows the priority broadcast to be activated by voice
  • Priority setting function
  • Remote confirmation function that allows you to confirm the unit’s status through the web browser using a PC
  • Switchable speaker output (4 ohms or 70 V)
  • Module slots provided for mounting up to 2 units of 900 Series modules
  • Electronically balanced 4-microphone inputs (MIC 1 to MIC 4) with Input setting switches
  • Fine sound adjustment possible by connecting a signal processor like an equalizer between the pre-amplifier output and the power amplifier input
  • Bass and treble tone control knobs
  • Output level meter
  • Master volume control knob to simultaneously adjust all input levels
  • Remotely controllable master volume
  • Built-in chime unit (1-note chime, 2-note chime, and ascending 4-note chime)
  • Equipped with the following signal processing functions: Dynamic feedback filters, Equalizer (3 points), Gate, Software volume, Limiter, and Ducker

Toa Electronics A-824D Specs

Form Factor/Type
Tabletop (Rack-Mountable with Included Hardware)
Number of Mixer Inputs
6
Number of Amplifier Channels
1
Load Impedance/Voltage Support
4 Ohms
70 V
Power Rating per Channel
1x 240 W at 4 Ohms
1x 240 W at 70 V
Performance
Protections
Power Supply
Frequency Response
50 Hz to 20 kHz ±3 dB (1/8 Power)
SNR/Noise
88 dB SNR (Main Output, Master Volume Minimum)
76 dB SNR (Main Output, Master Volume Maximum)
55 dBA SNR (Line Input 1 to 6)
THD/Distortion
≤ 1% Distortion (1 kHz, at Rated Power)
Signal Processing
DSP
Yes
Audio Delay
No
EQ & Filters
2-Band EQ
Dynamics
Compressor, Ducking/Muting, Limiter
Connectivity
Analog Audio I/O
1x Block 3-Pin Speaker Output
6x Block 3-Pin Line/Mic Input
2x Stereo 2RCA Unbalanced Preamp Output
Digital Audio I/O
No
Network I/O
1x RJ45 Ethernet
Other I/O
2x Block 4-Pin Control
1x DB-9 Control/RS-232
2x Proprietary I/O Module Slot
USB I/O
No
Phantom Power
+24 V
Wireless
No
Power
Input Power
120 VAC, 60 Hz
AC Power Connector
1x IEC
Physical
Display
Single-LED Indicators Only
Dimensions
16.5 x 12.3 x 3.8" / 419.1 x 312.4 x 96.5 mm
Weight
11.46 lb / 5.2 kg
Packaging Info
Package Weight
15.64 lb
Box Dimensions (LxWxH)
19.9 x 16.4 x 7.3"

Toa Electronics A-824D Reviews

TOA A-800D series not living up to old TOA standards

By Steve
Rated 2 out of 5
Date: 2025-04-23

I've been installing TOA amplifiers for the past 22 years, relying heavily on the (now discontinued) A-700 series amplifiers. To date, I've never had to replace one. The A-800D series appears to be the functional replacement, so I started using that series. Of the two A-824D amps that I have recently installed, both have failed. The first failed during a TOA-recommended firmware update, bricking the amplifier. Fortunately, it hadn't been installed yet, but it caused a big delay in the customer's installation time-table, especially since TOA was VERY slow to acknowledge and replace the dead unit. The next A-824D died within 2 weeks of being installed. It was driving about 48W worth of 70V speakers (value measured with TOA impedance meter). Replacement time was delayed because of a couple of missing Euro connectors, rack ears, and security knobs. As a result, I am reluctant to use the A-800D series; maybe going back to the old A-900 amps & modules. I really want to like the new amplifiers, but am having a hard time doing so. Time will tell as to how the A-800D will hold up.

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