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MULTI-CHANNEL
DIGITAL POWER AMPLIFIERS
DA-250F/250FH/250D/250DH/550F/500F-HL
Top-of-the-line operation and
performance efficiency
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Full
Digital
*
Amplifier
*Amplifiers feature switching power supply and Class-D technology.
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.
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FEATURES
High efficiency
Extremely high amplification efficiency of 80-90%,
resulting in reduction in power consumption by more than
60% compared with Class-AB amplifiers.
Efficiency vs Output
DA Series Amplifier
100
90
80
70
60
50
40
Efficiency (%)
30
20
10
0 2040 60 80 100
Conventional AB-class Amplifier
Output (%)
Highly durable
Stands up to extended hours of operation. The DA
amplifier has undergone a large number of rigorous tests
to prove its durability. In addition, TOA has been
conducting a “non-stop driving test” of the DA Series.
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.
Conventional Amp.
High reliability
The DA amplifier has a comprehensive protection circuitry
for protection against excessive current flow due to
overload, short circuit, unusual DC voltage output, and
heat sink temperature rise (DA-250D/DH, DA-550F/
500F-HL: over 100°C, DA-250F/FH: over 110°C).
Independent power
supply
Each of the channels has its own power supply. If the
power supply of Channel 1 should fail, this won't affect
the operation of Channels 2-4 (Channel 2 in case of
DA-250D/DH). It is also possible to use one of the
channels as a spare amplifier.
Conventional Amplifier
Power supply from transformer
Total: 16,000W
41U
Power
Supply
DA-250 Series Amp.
Total: 16,000W
21U
DA Series Amplifier
Power
Supply
DA-500 Series Amp.
Total: 16,000W
AC power supply
Power
Supply
Power
Supply
19U
Power
Supply
Inside of DA-250F/FH model.
Power Amplifier
Power Amplifier
With built-in power supply
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Design optimization for
efficient and reliable
high-level performance
The TOA DA-250F/FH, DA-250D/DH and DA-550F/500F-HL multi-channel
power amplifiers offer a wider choice of power ratings, advanced digital
Class D amplification circuitry, and a highly efficient AC mains to output power
ratio, for the complete technological superiority it takes to support long-term
installation applications. These energy-efficient, space-saving amplifiers are designed to combine
high levels of performance and efficiency, and are well-suited to ensure sound reinforcement reliability
in a wide range of venue types. The low-impedance models are ideal for multi-zone applications such
as presentation and press-conference rooms, restaurants and similar-sized locations. The highimpedance units are well-suited to such locations as exhibition halls, sports facilities, multipurpose
halls and houses of worship.
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MT-251H
Matching Transformer (option)
Capacity: 0 – 250W
Primary impedance: 100V line: 40Ω (250W), 70V line: 19.6Ω (250W)
Secondary impedance: 100V line: 40Ω (250W), 70V line: 19.6Ω (250W), 50V line: 10Ω (250W),
Frequency Response: 30 – 18,000Hz (+0dB, –3dB)
Connection Terminal: M3 screw terminal, distance between barriers: 6.6mm
Dimensions: 108(W) × 80(D) × 122(H) mm (4.25" × 3.15" × 4.8")
Weight: 2.4kg (5.29 lb)
DA-250D (rear)
DA-250F (rear)
DA-500F-HL (rear)
35V line: 4.9Ω (250W)
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SPECIFICATIONS
Model DA-250F DA-250FH DA-250D DA-250DH DA-550F DA-500F-HL
Power Req. 120V AC, 50/60Hz
Number of Channels 424
Total Output All Channel Driven 1000W (1kHz, 4Ω) 1000W (1kHz, 19.6Ω) 500W (1kHz, 4Ω) 500W (1kHz, 19.6Ω) 2200W (1kHz 4Ω) 400W (1kHz, 4Ω)
Output Voltage per Channel 31.6V (1kHz, 4Ω) 70V (1kHz, 19.6Ω) 31.6V (1kHz, 4Ω) 70V (1kHz, 19.6Ω) 46.9V (1kHz, 4Ω) 20V (1kHz, 4Ω)
Output Current per Channel 7.9A (1kHz, 4Ω) 3.6A (1kHz, 19.6Ω) 7.9A (1kHz, 4Ω) 3.6A (1kHz, 19.6Ω) 11.7A (1kHz, 4Ω) 5A (1kHz, 4Ω)
Power Output
8 ohms per channel 170W — 170W — 350W 550W
4 ohms per channel 250W — 250W — 550W 100W*
16 ohms bridged 340W — 340W — 700W 1100W
8 ohms bridged 500W — 500W — 1100W —
Hi-Z: 70V per channel — 250W — 250W — 500W
Hi-Z: 140V bridged, per channel — 500W — 500W — 1000W
Power Consumption*
Idle power consumption 56W, 1.0A 58W, 1.0A 28W, 0.5A 35W, 0.7A 63W, 1.2A 69W, 1.3A
Rated power consumption
1/8 Power Pink noise*
1/3 Power Pink noise*
1/8 Power 1kHz 8 ohms 152W, 2.5A — 84W, 1.4A — 277W, 4.5A 410W, 6.3A
1/3 Power 1kHz 8 ohms 314W, 4.7A — 160W, 2.5A — 519W, 8.6A 991W, 13.5A
Frequency Response
THD 0.1 % (1kHz) HPF ON: 0.1 % (1kHz), 0.1 % (1kHz) HPF ON: 0.1 % (1kHz), 0.1 % (1kHz) 0.1 % (1kHz)
S/N Ratio (A weighted) 100dB
Crosstalk at 10kHz (A weighted) 70dB
DC Offset* ±5mV
Voltage Gain* 29.5dB 35.1dB 29.5dB 35.1dB 32.6dB 35.1dB
Damping Factor* 100 220 100 220 95 115
Inputs Input impedance 10kΩ (unbalanced), 20kΩ (balanced) 10kΩ (unbalanced), 20kΩ (balanced)
Protection Circuit
Cooling Continuously constant speed fan with front-to-rear airflow, Continuously constant speed fan with front-to-rear airflow,
Operating Temperature –10°C to +40°C (14°F to 104°F)
Operating Humidity Under 90% RH (no condensation)
Dimensions 482 (W) × 44 (H) × 401 (D)mm 482 (W) × 88.4 (H) × 404.2 (D)mm
(18.98" × 1.73" × 15.79") (18.98" × 3.48" × 15.91")
Weight 6.6kg (14.6 lb) 5kg (11.02 lb) 8.8kg (19.4 lb)
Finish Panel: Aluminum, alumite process, black/Case: Plated steel sheet
Accessory Euro style terminal block connector (3-pin) × 4, Euro style terminal block connector (3-pin) × 2, Euro style terminal block connector (3-pin) × 4,
Option —
0dB=0.775Vrms
*Typical data
1
For a 4Ω speaker, max. output is limited to 100W.
*
2
1/8 power with pink noise represents typical program with occasional clipping.
*
3
1/3 power with pink noise represents severe program with heavy clipping.
*
1kHz 8 ohms 850W, 11.7A — 420W, 5.9A — 1650W, 22.4A 2600W, 33.2A
2
3
0.3 % (20Hz – 20kHz) 0.3 % (100Hz – 20kHz) 0.3 % (20Hz – 20kHz) 0.3 % (100Hz – 20kHz) 0.15 % (20Hz – 20kHz)
0.3 % (20Hz – 20kHz) 0.3 % (20Hz – 20kHz)
Input sensitivity +4dB (1.23V) +4dB (1.23V)
Input clipping 14V (25.1dBu) 12V (23.8dBu)
Amplifier section DC output, overheat protection, load shorting, overload current, maximum output
Power supply section Overheat protection, AC rush current
680W (1kHz, 8Ω) 340W (1kHz, 8Ω) 1400W (1kHz, 8Ω) 2200W (1kHz, 8Ω)
36.9V (1kHz, 8Ω) 36.9V (1kHz, 8Ω) 52.9V (1kHz, 8Ω) 66.3V (1kHz, 8Ω)
4.6A (1kHz, 8Ω) 4.6A (1kHz, 8Ω) 6.6A (1kHz, 8Ω) 8.3A (1kHz, 8Ω)
4 ohms 1300W, 16.9A — 650W, 8.7A — 2800W, 35.5A 580W, 9.1A
70 Volts — 1200W, 15.9A — 580W, 7.8A — 2350W, 30.4A
8 ohms 183W, 3.0A — 102W, 1.7A — 317W, 5.2A 504W, 7.4A
4 ohms 257W, 4.2A — 132W, 2.3A — 658W, 9.7A 171W, 2.9A
70 Volts — 265W, 4.1A — 147W, 2.3A — 437W, 6.7A
8 ohms 362W, 5.4A — 197W, 3.1A — 667W, 9.5A 1080W, 15.2A
4 ohms 597W, 8.6A — 308W, 4.4A — 1060W, 14.0A 313W, 4.9A
70 Volts — 609W, 8.5A — 311W, 4.5A — 1036W, 13.9A
4 ohms 219W, 3.5A — 112W, 1.8A — 510W, 7.6A 151W, 2.7A
70 Volts — 224W, 3.6A — 123W, 2.0A — 374W, 5.9A
4 ohms 507W, 7.3A — 222W, 3.4A — 958W, 13.0A 260W, 4.3A
70 Volts — 499W, 7.2A — 256W, 3.8A — 883W, 12.2A
20Hz – 20kHz (±1dB) HPF ON: 50Hz – 20kHz 20Hz – 20kHz (±1dB) HPF ON: 50Hz – 20kHz 20Hz – 20kHz (–2dB, +1dB) HPF ON: 50Hz – 20kHz
4-CHANNEL DIGITAL
POWER AMPLIFIERS
(–3dB, 0dB) (–3dB, 0dB) (–3dB, +1dB)
HPF OFF: 20Hz – 20kHz HPF OFF: 20Hz – 20kHz HPF OFF: 20Hz – 20kHz
(±1dB) (±1dB) (–2dB, +1dB)
HPF OFF: 0.1 % (1kHz), HPF OFF: 0.1 % (1kHz),
DA-250F/250FH/550F/500FH
50,000 hours life time at 25°C 100,000 hours life time at 25°C
Tamper-proof cap × 4 Tamper-proof cap × 2 Tamper-proof cap × 4
Matching transformer: MT-251H
—
Matching transformer: MT-251H
—
2000W (1kHz, 9.8Ω)
70V (1kHz, 9.8Ω)
7.1A (1kHz, 9.8Ω)
1
HPF ON: 0.3 % (100Hz – 20kHz)
HPF OFF: 0.3 %
(20Hz – 20kHz)
Matching transformer: MT-251H
Human Society with
Sound & Communication
TOA Corporation
www.toa.jp
Specifications are subject to change without notice.
Printed in Japan (0803) 833-52-362-4A u
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