TOA Digital Multi-Channel 550 Watts x 4 Power Amplifier 4 ohm (DA550FCUA00)

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The DA-550F is a 4-Channel Digital Power Amplifier featuring lightweight, compact, high power output, and high efficiency. It delivers 550 W x 4 channels (4 ohm output) using a switching power supply. Each channel is equipped with an independent power section. Its Control/Monitor terminals permit power ON/OFF control of the individual channels and status monitoring for the power ON/OFF on each channel, protection on each channel, and fan operation. Prepare the control panel or status monitor display panel separately. It can be mounted in an EIA Standard equipment rack (2 unit size).

Full Digital Amplifier

TOA Digital Amplifier technology redefines the very concept of amplifiers.

The power supply unit is the heart of the amplifier. To ensure consistently high performance and reliable operation, TOA engineers have given the DA Series a system that provides power independently to each channel. This testifies to TOA's attitude to product development, which is always totally motivated by the desire to provide high-quality products that offer worry-free use. Never compromise — that's the TOA philosophy

High efficiency

Extremely high amplification efficiency of 80-90%, resulting in reduction in power consumption by more than 60% compared with Class-AB amplifiers.

Amplifier with world-class lightweight design*

Installation has become much easier thanks to the lightweight design. *TOA comparative data (weight/watt)

Compact design

The DA-250 Series is 1-unit size and the DA-500 Series is 2-unit size, and they can be efficiently mounted on a rack, so they require only a small installation space. Because the amplifiers do not generate much heat, 5 units can be stacked together in a rack.

Power Source

120 V AC, 50/60 Hz

Amplification System

Class D

Power Consumption

480 W (based on UL/CSA standards), 2800 W (rated output 4 Ω), 1650 W (rated output 8 Ω)


4 circuits, +4 dB* (1.23 V) (input level control in maximum position), 10 kΩ, electronically-balanced, removable terminal block (3 pins), XLR-3-31 type connector
CH 1 mode ON/OFF switch (ON: CH 1 to All ch, OFF: Each ch)

Rated Output

4 channels: 550 W × 4 (4 Ω), 350 W × 4 (8 Ω)
2 channels (BRIDGE): 1100 W × 2 (8 Ω)
M4 screw terminal, distance between barriers: 8.8 mm (0.35")

Frequency Response

20 - 20,000 Hz (-2 dB, +1 dB)

Total Harmonic Distortion

0.1% (1 kHz)
0.15% (20 - 20,000 Hz)

Protection Circuit

Protection against excessive current flow due to overload, short circuit, unusual DC voltage output, temperature rise at power amp. heat sink (100℃ or more (212°F)), temperature rise at power supply heat sink (80℃ or more (176°F))

S/N Ratio

100 dB (A-weighted)


70 dB (A-weighted)


Control input: Power ON/OFF status of the individual channels, photocoupler input, drive voltage: 9 V DC (Min) - 14 V (Max), 12 V (Typ)
Monitor output: Power ON/OFF status of the individual channels, Protection status of the individual channels, Fan operation status, photocoupler open collector output, withstand voltage: 30 V DC, control current: Under 12 mA
Connector: RJ-45 connector × 2
Connection cable: Category 5 twisted pair cable for LAN (CAT5-UTP)
Maximum cable distance: 600 m (656.17 yd)

LED Indicator

Power (blue) × 1, Input (green) × 4, Output (yellow) × 4, Peak (red) × 4, Protect (red) × 4


Forced air cooling

Operating Temperature

-10℃ to +40℃ (14°F to 104°F)

Operating Humidity

90% RH or less (no condensation)


Panel: Aluminum, black, alumite
Case: Plated steel sheet


482 (W) × 88.4 (H) × 404.2 (D) mm (18.98" × 3.48" × 15.91")


8.8 kg (19.4 lb)


Removable terminal plug (3 pins) …4, Tamper-proof cap …4

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