OSD Audio MTR-250 User Manual

MTR-250 USER MANUAL

70V/100V Line Matching Transformer Combiner

1

2

3

I N T R O D U C T IO N

:

The MTR-250 70V/100V Line Matching Transformer Combiner enables the conversion from an 8 Ohm
amplier output to a 70V/100V. This unit is ideal for both professional stage or PA applications which
require running multiple pairs of speakers to a single amplier.

F E AT U R E

:

S

Rugged 1U Metal Chassis
Internal Constant Voltage Transformers
Extensive Short Circuit & Overload Protection
Signal In LED Indicator

S P E C I F IC A T IO N S

:

70V/100V Mono Power Output, RMS 250W
Frequency (-1dB): 20Hz-20kHz
Stereo Output 85W Per Channel Into 8 Ohm Loads

2 5 0 W

7 0 00 P E A K E R S

MT R -2 5 0

70V/100 Line Matching Transformer

RMS 250W

70V 100V

COM

(20Ω) (40Ω)

POWER OUT SELECT

4

Signal In LED Indicator.

1.
Stereo Out LED Indicator.

2.
70V/100V Out LED Indicator

3.
70V/100V Mono Speaker Output.

4.
Power Out Select. Left = 8 Ohm Output. Right = 70V/100V Output.

5.
8 Ohm Stereo Speaker Output.

6.
AMP Stereo In. Maximum Capacity 85W per channel at 8 Ohm. For bridge connection, connect amplier’s

7.

SIGNA L IN

RMS 8Ω 8 5W×2

L+L-R

5

STEREO / OUT

-

+

R

6

100V-70V / OUT

RMS 8Ω

BRIDG E

250W

85W 85W

+

+

L-R

L

POWER IN

7

-

R

“+” to the “L+” screw terminal connector and connect “-“ to the “R+” screw terminal connector. Maximum
power handling for bridge connection is 250W.

RMS 500W

COM

70V 100V

(10Ω) (20Ω)

POWER OUT SELECT

RMS 8Ω 1 70W×2

-

L+L-R

R

+

RMS 8Ω

BRIDG E

500W

170W 170W

+

+

L-R

L

POWER IN

-

R

R M 5 CH AM P

170W 8 OHM 500W 8 OHM170W 8 OHM

Fixed resistance output mode, connect the amplier in stereo mode, put the “POWER OUT
SELECT” to the left, connect 2 8ohm speakers to the “8 Ohm Stereo Output” as above.

OSD Audio • 775 Columbia St • Brea • CA • 92821 • www.osdaudio.com • Tel [phone] • Fax [phone]

RMS 500W

70V 100V

COM

(10Ω) (20Ω)

POWER OUT SELECT

85W 8OHM SPEAKE S X 2

RMS 8Ω 1 70W×2

-

L+L-R

R

+

RM 5 C H AMP

RMS 8Ω

BRIDG E

500W

170W 170W

+

+

L-R

L

POWER IN

170W 8 OHM 500W 8 OHM170W 8 OHM

-

R

Constant-voltage output mode, connect the amplier in bridge mode, put the “POWER OUT SELECT” to
the right, then connect 70V/100V in wall/ in ceiling speakers to the “70V/100V MONO OUTPUT” in series,
the total power of speaker should be below 250W