Toa DA-250D, DA-250DH Specifications

DA-250D/250DH

Dual-Channel Digital Power Amplifiers

DA-250D

DA-250DH

DESCRIPTION

The TOA DA-250D and DA-250DH dual-channel power amplifiers offer a wider choice of power ratings, advanced 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 DA-250D is ideal for dual-zone applications such as presentation and press-conference rooms, restaurants and
similar-sized locations. The DA-250DH is well-suited to such locations as exhibition halls, sports facilities, multipurpose halls
and houses of worship.

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.

• 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.

• 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 power amplifier
heat sink temperature rise ( over 100°C), temperature rise inside the unit (over 80°).

• Amplifier with lightweight design

Installation has become much easier thanks to the lightweight design.

• Compact design

The DA-250 Series is 1-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.

• 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 Channel 2. It is also possible to use the either
channel as a spare amplifier.

DA Series Amplifier

100

90
80
70
60
50
40

Efficiency (%)

30
20
10

0 2040 60 80 100

Conventional AB-class Amplifier

Output (%)

CU Version

DA-250D Frequency Response

[dB]

0

-1

-2

Output

-3

-4

-5
110100 1k 10k 100k

Frequency

1/8W 8Ω

1/8W 4Ω

DA-250D T.H.D vs Power Output

[%]

1.8

1.6

1.4

1.2

1

0.8

Output

0.6

0.4

0.2

0

-0.2

[Hz]

0.1 1 10 100 1k

4Ω 1kHz

8Ω 20kHz 8Ω 20Hz

4Ω 20kHz

8Ω 1kHz

Power Output

4Ω 20Hz

DA-250D Channel Seperation

[dB]

-65

-70

-75

-80

Output

-85

-90

ch2

-95

-100

[W]

10 100 1k 10k 100k

Frequency

[Hz]

DA-250DH Frequency Response

[dB]

0

-2

-4

-6

-8

Output

-10

-12

-14

-16

-18
110100 1k 10k 100k

Frequency

1/8W 19.6Ω

Efficiency vs Output

[%]

90

DA-250D (4Ω drive)

80

70

60

50

Output

40

30

20

10

0

020406080100

DA-250DH (19.6Ω drive)

DA-250D (8Ω drive)

Output

DA-250DH T.H.D vs Power Output

[%]

1.8

1.6

1.4

1.2

1

0.8

Output

0.6

0.4

0.2

40Ω 1kHz

0

40Ω 20kHz

-0.2

[Hz]

0.1 1 10 100 1k

[%]

Power Output

40Ω 50Hz

DA-250DH Channel Seperation

[dB]

-65

-70

-75

-80

Output

-85

ch2

-90

-95

-100

[W]

10 100 1k 10k 100k

Frequency

[Hz]

APPEARANCE AND DIMENSIONAL DIAGRAM

442 (17.4")

Rear View

482 (18.98")
465 (18.31")

Front View

401.8 (15.82")
371(14.61")

Side View

22.5 (0.89")

31.8 (1.25")

44

(1.73")

6.1 (0.24")

Unit: mm