Toa DA-250F User manual

DESCRIPTION ●
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The DA-250F and DA-250FH power amplifiers utilize
advanced digital technology to provide multi-channel high
power outputs. Featuring high efficiency amplifier topology, the
low impedance version DA-250F and high impedance version
DA-250FH are ideal for various installed sound applications.
The lightweight construction and compact dimensions of the
DA Series allows for easy placement in virtually any venue, as
well as for use in stacked configurations as required. Each
amplifier is equipped with low-noise constant speed fans for
adequate cooling and designed for ultra-reliable long-term
operation with multiple independent power supplies that
ensure uninterrupted operation even if a channel fails.
Redundant protection circuitry monitors amplifier status and
protects the amplifier and system in case of problems.
MULTI-CHANNEL POWER AMPLIFIERS
DA-250F/DA-250FH
Versatile enough for any venue.
Both amplifiers are well-suited for a wide variety of installed
sound requirements. The DA-250FH is ideal for venues
ranging from exhibition halls, sports facilities and
gymnasiums to houses of worship, meeting halls and
many other locations. The DA-250F proves ideal for sound
reinforcement in multi-zone applications such as
presentation and press conference rooms as well as
restaurants and similarly sized locations.
Compact and lightweight
The powerful yet compact DA-250F and DA-250FH
amplifiers occupy only one standard rack space and weight
only 6.6kg (14.6 lbs)* allowing flexible installation options.
For complex installed sound
applications, amplifiers can be
stacked together, requiring only
one perforated airflow panel between
every 5 units. The amplifiers are also
equipped with dual low-noise
constant speed fans to ensure
adequate cooling in demanding
environments and extend operational
reliability and service life.
*220 – 240V AC version: 6.8kg (15.0 lbs)
Enhanced reliability for trouble-free operation.
Both amplifiers have been over-
engineered to provide long
term operation under demanding
conditions. Fully independent
power supplies for each of the
4 amplifier channels enhances
reliability and allows uninterrupted
operation in the event a channel
should fail. This is a significant
advantage in remote installations
where service access may be
difficult. Each unit also
incorporates TOA's no-compromise
build quality to minimize any
problem as well as
comprehensive protection circuitry.
Comprehensive protection circuitry.
Advanced protection circuitry monitors voltage, current and
thermal levels and disables output to minimize potential
damage from overloads, short circuit, DC offset or
overheating.
Control cover eliminates tampering.
Each amplifier includes attenuator security covers to
prevent control settings from unauthorized adjustments.
FEATURES
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High-efficiency amplifier topology.
TOA's proprietary amplifier topology achieves approx. 85%
efficiency in AC mains to output power conversion.
The high-efficiency, compact
design operates at much
lower temperature levels
eliminating the need for
large heat sinks.
Amplifier design optimized for installed sound
applications
The DA-250F and 250FH are specifically designed to
produce high power with high efficiency. Along with
switching mode power supplies, the amplifiers also offer
the high power advantages of Pulse Width Modulation
(PWM) which requires much smaller power supply voltage
than conventional amplifier designs.
Two configurations suit different applications.
Along with the low impedance version DA-250F, a high
impedance version DA-250FH, is available for 70/100
volt applications.
Easily accommodates high power requirements.
Both amplifiers can be conveniently bridged* (Channels
1/2 and 3/4 bridgeable), increasing the output from 250W
into 4 channels up to 500W into 2 channels.
* without DA-250FH 220 – 240V AC version.
Conventional AB-class Amplifier
DA-250 Series
Efficiency (%)
Output (%)
100
90
80
70
60
50
40
30
20
10
0 2040 60 80 100
Power Amplifier
Power
Supply
Power supply from transformer
Conventional Amplifier
Power Amplifier
With built-in power supply
AC power supply
DA-250 Series
Conventional Amp. DA-250 Series Amp.
"Up to 20 amplifier
channels in only
five rack spaces!"

110100 1k 10k 100k
[Hz]
[dB]
0
-2
-4
-6
-8
-10
-12
-14
-16
-18
Output
1/8W 19.6Ω
Frequency
DA-250FH Frequency Response
-5 110100 1k 10k 100k
[Hz]
[dB]
0
-1
-2
-3
-4
Output
1/8W 8Ω
1/8W 4Ω
Frequency
DA-250F Frequency Response
10 100 1k 10k 100k
[Hz]
[dB]
-65
-70
-75
-80
-85
-90
-95
-100
Output
ch2
ch4
ch3
Frequency
DA-250FH Channel Separation
020406080100
[%]
[%]
90
80
70
60
50
40
30
20
10
0
Output
Output
Efficiency vs Output
DA-250F (4Ωdrive)
DA-250F (8Ωdrive)
DA-250FH (19.6Ωdrive)
(120V AC Version)
(120V AC Version/220 – 240V AC Version)
-5 110100 1k 10k 100k
[Hz]
[dB]
0
-1
-2
-3
-4
Output
Frequency
1/8W 4Ω
1/8W 8Ω
DA-250F Frequency Response
110100 1k 10k 100k
[Hz]
[dB]
0
-2
-4
-6
-8
-10
-12
-14
-16
-18
Output
1/8W 40Ω
Frequency
DA-250FH Frequency Response
0.1 1 10 100 1k
[W]
[%]
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
-0.2
Output
4Ω1kHz
Power Output
8Ω20kHz
8Ω1kHz
4Ω20Hz8Ω20Hz
4Ω20kHz
DA-250F T.H.D vs Power Output
0.1 1 10 100 1k
[W]
[%]
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
-0.2
Output
40Ω1kHz 40Ω50Hz
40Ω20kHz
Power Output
DA-250FH T.H.D vs Power Output
10 100 1k 10k 100k
[Hz]
[dB]
-65
-70
-75
-80
-85
-90
-95
-100
Output
ch2
ch3
ch4
Frequency
DA-250F Channel Separation
020406080100
[%]
[%]
90
80
70
60
50
40
30
20
10
0
Output
DA-250F (4Ωdrive)
DA-250F (8Ωdrive)
Output
Efficiency vs Output
DA-250FH (40Ωdrive)
(220 – 240V AC Version)
0.1 1 10 100 1k
[W]
[%]
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
-0.2
Output
Power Output
4Ω1kHz
8Ω20kHz 8Ω20Hz
8Ω1kHz
4Ω20Hz
4Ω20kHz
DA-250F T.H.D vs Power Output
0.1 1 10 100 1k
[W]
[%]
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
-0.2
Output
40Ω1kHz 40Ω50Hz
40Ω20kHz
Power Output
DA-250FH T.H.D vs Power Output
DA-250 SERIES

CHARACTERISTIC DIAGRAMS
APPEARANCE AND DIMENSIONAL DIAGRAM
THERMAL LOSS TABLES
OPTIONAL ACCESSORY
Unit: mm
•Capacity: 0W – 250W
•Primary Side: 100V line, 70V line
•Secondary Side: 100V line, 70V line, 50V line
•Frequency Response: 30 – 18,000Hz (+0dB, –3dB)
•Connection Terminal: M4 screw terminal, distance between barriers: 8.1mm
•Weight: 3.7kg
MT-250H
Matching Transformer
Designed for use with the DA-250FH Multi-Channel Power
Amplifier (option), the MT-250H Output Transformer electrically
isolates the amplifier and the high-impedance speaker system.
Rear View
401.4
394.1
Side View
44
6.1 31.8
482
465
Front View
Top View
Side View
Bottom View
100 V line
70 V line
50 V line
COM COM
100 V line
70 V line
OUT
IN (0W – 250W)
60
131
116
Max. 80 Max. 140
(220-240V AC version)
Mode Model No. Load Btu/hr kcal/hr Efficiency(%)
Idle DA-250FH 100V ×4ch 257.9 65 —
DA-250F 8 Ω×4ch 163.9 41.3 —
1/8 Power (pink noise) DA-250FH 100V ×4ch 496.0 125.0 46.2
DA-250F 8 Ω×4ch 280.1 70.6 50.9
4 Ω×4ch 423.0 106.6 50.2
1/3Power (pink noise) DA-250FH 100V ×4ch 540.0 136.1 67.8
DA-250F 8 Ω×4ch 418.2 105.4 64.9
4 Ω×4ch 606.3 152.8 65.2
Full Power (sin) DA-250FH 100V ×4ch 562.7 141.8 85.5
DA-250F 8 Ω×4ch 442.4 111.5 83.1
4 Ω×4ch 821.0 206.9 81.8
(120V AC version)
Mode Model No. Load Btu/hr kcal/hr Efficiency(%)
Idle DA-250FH 70V ×4ch 199.7 50.3 —
DA-250F 4 Ω×4ch 193.6 48.8 —
1/8 Power (pink noise) DA-250FH 70V ×4ch 446.2 112.4 50.8
DA-250F 8 Ω×4ch 317.9 80.1 49.2
4 Ω×4ch 385.5 97.1 56.2
1/3Power (pink noise) DA-250FH 70V ×4ch 850.1 214.1 59.1
DA-250F 8 Ω×4ch 417.9 105.3 66.2
4 Ω×4ch 720.1 181.4 64.7
Full Power (sin) DA-250FH 70V ×4ch 688.1 173.4 86.2
DA-250F 8 Ω×4ch 512.7 129.2 84.4
4 Ω×4ch 1071.0 269.9 80.4
*Typical data

SPECIFICATIONS
Model DA-250F DA-250FH
120V AC Version 220 – 240V AC Version 120V AC Version 220 – 240V AC Version
Number of channels 44 4 4
Total output all channel driven 1,000W (1kHz, 4Ω)1,000W (1kHz, 4Ω)1,000W (1kHz, 19.6Ω)1,000W (1kHz, 40Ω)
680W (1kHz, 8Ω)680W (1kHz, 8Ω)
Output voltage per channel 31.6V (1kHz, 4Ω)31.6V (1kHz, 4Ω)70V (1kHz, 19.6Ω)100V (1kHz, 40Ω)
36.9V (1kHz, 8Ω)36.9V (1kHz, 8Ω)
Output current per channel 7.9A (1kHz, 4Ω)7.9A (1kHz, 4Ω)3.6A (1kHz, 19.6Ω)2.5A (1kHz, 40Ω)
4.6A (1kHz, 8Ω) 4.6A (1kHz, 8Ω)
Power output
8 ohms per channel 170W 170W — —
4 ohms per channel 250W 250W — —
16 ohms bridged 340W 340W — —
8 ohms bridged 500W 500W — —
Hi-Z: 70V/100V per channel —— 250W 250W
Hi-Z: 140V bridged, per channel —— 500W —
Power consumption*
Idle power consumption 56W, 1.0A 48W, 0.3A 58W, 1.0A 75W, 0.5A
1/8 Power 8 ohms Pink noise 183W, 3.0A 167W, 1.2A — —
4 ohms 257W, 4.2A 248W, 1.6A — —
70 Volts —— 265W, 4.1A —
100 Volts —— — 270W, 1.9A
1/3 Power 8 ohms 362W, 5.4A 349W, 2.4A — —
4 ohms 597W, 8.6A 511W, 3.7A — —
70 Volts —— 609W, 8.5A —
100 Volts —— — 491W, 3.5A
1/8 Power 8 ohms 1kHz 152W, 2.5A 143W, 1.0A — —
4 ohms 219W, 3.5A 202W, 1.4A — —
70 Volts —— 224W, 3.6A —
100 Volts —— — 230W, 1.6A
1/3 Power 8 ohms 314W, 4.7A 284W, 1.9A — —
4 ohms 507W, 7.3A 437W, 3.0A — —
70 Volts —— 499W, 7.2A —
100 Volts —— — 443W, 3.0A
Frequency response 20Hz – 20kHz, ±1dB 20Hz – 20kHz, ±1dB
20Hz – 20kHz, ±1dB (HPF OFF) 50Hz – 20kHz, –3dB, +0dB
50Hz – 20kHz, –3/+0dB (HPF ON)
Total harmonic distortion (THD) 0.1 % 0.1 %
(1kHz)
S/N ratio (A weighted) 100dB 100dB
Crosstalk at 10kHz (A weighted) 70dB 70dB
DC offset* ±5mV ±5mV
Voltage gain* 29.5dB 35.1dB
Damping factor* 100 120
Inputs
Input impedance 10kΩ(unbalanced), 20kΩ(balanced) 10kΩ(unbalanced), 20kΩ(balanced)
Input sensitivity +4dB (1.23V) +4dB (1.23V)
Input clipping 14V (25.1dBu) 14V (25.1dBu)
Front panel
Gain controls 30 position detent 30 position detent
Indicators per channel: Input Green LED Green LED
Output Yellow LED Yellow LED
Peak Red LED Red LED
Protect Red LED Red LED
Power-On Blue LED Blue LED
Rear panel
Input connectors Detachable Euro style terminal block (electrically balanced) Detachable Euro style connector (electrically balanced)
Speaker output Screw terminal (M4). Accept AWG14-22 Screw terminal (M4). Accept AWG14-22
Protection circuit Amplifier section DC output, overheat protection, load shorting, overload current, maximum output
Power supply section Overheat protection, AC rush current
Cooling Continuously constant speed fan with front-to-rear airflow,
50,000 hours life time
Power requirement AC mains, 50/60Hz
Operating Temperature –10°C to +40°C
Operating Humidity Under 90% RH (no condensation)
Dimensions (W ×H ×D) 482mm (19") × 44mm (1.7") × 401mm (15.8") (EIA Standard 19-inch rack mount width)
Weight 6.6kg (14.6 lbs ) 6.8kg (15.0 lbs ) 6.6kg (14.6 lbs ) 6.8kg (15.0 lbs )
Finish Panel: Aluminum, alumite process, black
Case: Plated steel sheet
Accessory Euro style terminal block connector (3-pin) ×4, Volume control cover ×4
Option — Matching transformer: MT-250H
0dB=0.775Vrms
*Typical data
Specifications are subject to change without notice.
Printed in Japan (0604) 833-52-363-90 u
TOA Corporation
URL : http://www.toa.jp/