Toa MT-251H User Manual
INSTRUCTION MANUAL
MATCHING TRANSFORMER
1. SAFETY PRECAUTIONS
WARNING
• External wiring connected to the terminals requires installation by an instructed person.
• Be sure to replace the unit's terminal cover after connection completion. Because the voltage
of up to 100 V is on the both primary and secondary sides, never touch these terminals to
avoid electric shock.
• Use the specied ampliers in combination. Failure to follow this instruction could result in
damage to the speaker.
• When bridge-connecting the ampliers, never use the MT-251H, as this will damage the
speakers and the MT-251H. (DA-250DH CU, DA-250FH CU, and DA-500F-HL CU only)
Indicates a potentially hazardous situation which, if mishandled,
could result in death or serious personal injury.
MT-251H
4.3. DA-500F-HL CU
[2 output channels connection] [Single output channel connection]
IN
100 V line
(Red)
70 V line
(Brown)
COM (Black) COM (Black)
IN
100 V line
(Red)
70 V line
(Brown)
COM (Black) COM (Black)
OUT
100 V line
(Yellow)
70 V line
(Orange)
50 V line
(Red)
35 V line
(Brown)
OUT
100 V line
(Yellow)
70 V line
(Orange)
50 V line
(Red)
35 V line
(Brown)
250 W
max.
250 W
max.
Note
Be sure to set the HPF (High-pass lter) to ON.
IN
100 V line
(Red)
70 V line
(Brown)
COM (Black) COM (Black)
IN
100 V line
(Red)
70 V line
(Brown)
COM (Black) COM (Black)
Note
Be sure to set the HPF (High-pass lter) to ON.
OUT
100 V line
(Yellow)
70 V line
(Orange)
50 V line
(Red)
35 V line
(Brown)
OUT
100 V line
(Yellow)
70 V line
(Orange)
50 V line
(Red)
35 V line
(Brown)
4.4. DA-500FH CE
[2 output channels connection] [Single output channel connection]
70 V line
500 W
max.
2. GENERAL DESCRIPTION
Designed for use with the DA-250DH, DA-250FH, DA-500F-HL and DA-500FH Multi-Channel Power
Amplifiers, the MT-251H electrically isolates the high-impedance speaker lines from the amplifier.
3. HANDLING PRECAUTIONS
• Be sure to adjust the input level so that amplier's Peak indicator does not light.
Operating the amplier while the Peak indicator is lit continuously or intermittently causes output
sound to be interrupted.
• Note that incorrect cable connection may damage the speakers.
4. CONNECTIONS
The cable connections to the MT-251H's taps on the primary and secondary sides differ depending
on the amplifier model to use.
[DA-250DH CU, DA-250FH CU] [DA-250DH CE, DA-250FH CE]
IN
100 V line
(Red)
70 V line
(Brown)
COM (Black) COM (Black)
OUT
100 V line
(Yellow)
70 V line
(Orange)
50 V line
(Red)
35 V line
(Brown)
250 W
max.
Note
Be sure to set the input sensitivity of the
amplier to +4 dB, and the HPF (High-pass
lter) to ON when using the amplier for
microphone announcement application.
Note
Be sure to set the input sensitivity of the
amplier to +4 dB when using the amplier for
microphone announcement application.
IN OUT
100 V line
(Red)
70 V line
(Brown)
COM (Black) COM (Black)
100 V line
(Yellow)
70 V line
(Orange)
50 V line
(Red)
35 V line
(Brown)
250 W
max.
IN
100 V line
(Red)
70 V line
(Brown)
COM (Black) COM (Black)
IN
100 V line
(Red)
70 V line
(Brown)
COM (Black) COM (Black)
OUT
100 V line
(Yellow)
70 V line
(Orange)
50 V line
(Red)
35 V line
(Brown)
OUT
100 V line
(Yellow)
70 V line
(Orange)
50 V line
(Red)
35 V line
(Brown)
IN
100 V line
(Red)
70 V line
(Brown)
A
COM (Black) COM (Black)
IN
100 V line
(Red)
70 V line
(Brown)
B
COM (Black) COM (Black)
OUT
100 V line
(Yellow)
70 V line
(Orange)
50 V line
(Red)
35 V line
(Brown)
OUT
100 V line
(Yellow)
70 V line
(Orange)
50 V line
(Red)
35 V line
(Brown)
Note
All of the following conditions should be met.
• A + B = 350 W max.
• A = 250 W max.
• B = 250 W max.
5. SPECIFICATIONS
Capacity 0 – 250 W
Primary Side 100 V line, 70 V line
Secondary Side 100 V line, 70 V line, 50 V line, 35 V line
Frequency Response 30 Hz – 18 kHz (+0 dB, –3 dB)
Connection Terminal M3 screw terminal, distance between barriers: 6.6 mm (0.26")
Dimensions 108 (w) x 80 (h) x 122 (d) mm (4.25" x 3.15" x 4.8")
Weight 2.4 kg (5.29 lb)
Note: The design and specications are subject to change without notice for improvement.
URL: http://www.toa.jp/
100 V line
350 W
max.
20140 7
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