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STEREO POWER AMPLIFIER M-900u

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6.   Display switch (DISPLAY)

Selects the power meter light and display.
This switch operates differently depending on the setting of 
the BTL selection switch on the rear panel.

When STEREO is selected:
•  Every  time  this  switch  is  pressed,  the  setting  changes 

as follows: light ON/power meter ON

light OFF/power 

meter ON

light OFF/power meter OFF

light ON/power 

meter ON...

When BTL (MONO) is selected:
•  Only the power meter at the left side operates.
•  Every time this switch is pressed, the setting changes as 

follows: right and left lights ON/power meter (left) ON

left 

light ON/power meter (left) ON

light OFF/power meter 

(left) ON

light OFF/power meter OFF

right and left 

lights ON/power meter (left) ON...

Factory default: as follows
At STEREO, 

power meter light ON

 

power meter display ON

At BTL (MONO), power meter right and left lights ON
 

power meter display ON (left)

The setting of the display switch is memorized in both STE-
REO and BTL (MONO), respectively.

7.   BTL indicator (BTL)

Lights when the BTL selection switch on the rear panel is 
set to BTL (MONO) to show that this unit turns to a monau-
ral amplifier with BTL connection.
When the BTL selection switch is set to STEREO, this indi-
cator turns off to show that this unit turns to a stereo ampli-
fier with normal connection.

Factory default: No lighting (STEREO)

8.   Power  meters

Indicates the level of output to the speakers, with lighting 
equipped.
The light/power meter operate differently depending on the 
setting of the display switch and the setting of the BTL se-
lection switch on the rear panel.
•  This  meter  indicates  the  output  level  in  decibels  from 

−60dB t10 dB during the power meter in op-
eration.

•  When STEREO is selected, the meter at left reads the level 

of the L channel, and the meter at right reads the level of 
the R channel.

•  When BTL (MONO) is selected, the level is indicated only 

with the left meter.

Summary of Contents for M-900u

Page 1: ...Owner sManual STEREO POWER AMPLIFIER M 900u...

Page 2: ...Contents Precautions 1 Features of This Unit 2 Names and Functions 4 Connections 8 Block Diagram 13 Specifications 14 Before Asking for Repair Services 15...

Page 3: ...the output circuit and cause a malfunction The sound is not generated shortly after the power supply is turned on This amplifier is equipped with a time muting circuit in order to separate the output...

Page 4: ...of the amplification circuit In addition the input stages of the error detection circuit are 3 parallelized to improve distortion and noise BTL connection mode The BTL connection mode with use of 2 un...

Page 5: ...e Peel coat PCB Dielectric effect of resist eliminated by using copper foil of 100 m in thickness and gold plating on audio circuit board instead of using resist High grade analog meter Large sized an...

Page 6: ...te to operation state When the main power switch on the rear panel is turned on to set this unit to the standby state and this switch is turned on this unit is set to the operation state When wiring o...

Page 7: ...lights ON power meter display ON left The setting of the display switch is memorized in both STE REO and BTL MONO respectively 7 BTL indicator BTL Lights when the BTL selection switch on the rear pane...

Page 8: ...tor on the front panel lights yellow to show that this unit turns to the standby state When this switch is turned off the standby indicator on the front panel turns off to show that the main power is...

Page 9: ...f 4 16 can be con nected to this unit When BTL MONO is selected this unit turns to a monaural power amplifier Therefore either right or left speaker sys tem can be connected exclusively If stereo play...

Page 10: ...connection exercise extra care not to conduct wrong connection between right and left channels If the right and left channels are connected reversely the localization of sound images is deteriorated t...

Page 11: ...speaker terminal of M 900u for the right channel Securely connect the terminal of the speaker system to the red SPEAKERS L terminal BTL of this unit and the terminal of the speaker system to the red...

Page 12: ...10 Connections CONTROL AMP SPEAKER SYSTEM L R L R REMOTE CD SACD PLAYER CD SACD PLAYER L R L L R R Normal stereophonic reproduction...

Page 13: ...STEREO POWER AMPLIFIER M 900u 11 CONTROL AMP CD SACD PLAYER CD SACD PLAYER L R L R Set to BTL MONO REMOTE Set to BTL MONO SPEAKER SYSTEM L R R R L L BTL stereophonic reproduction...

Page 14: ...12 CONTROL AMP CD SACD PLAYER CD SACD PLAYER L R L R REMOTE SPEAKER SYSTEM R HIGH L HIGH L R Hi Hi Low Low R LOW L LOW Connections Bi amplifier stereophonic reproduction...

Page 15: ...AY REG OP AMP REG ODNF AMP POWER SWITCH AC RELAY 1 AC RELAY 2 TRANS AMP TEMP REG ODNF AMP RECT ODNF RECT ODNF RECT OP RECT PWR RECT PWR RECT COM RECT RELAY TRANS CONTROL OUT SP L SPEAKER OUT L SPEAKER...

Page 16: ...Hz 130kHz S N ratio 117 dB IHF A weighted input short Damping factor 710 Attached equipment Main power switch Operation switch Input switch BTL selection switch Phase inverter switch Power meters Disp...

Page 17: ...level of the input device is set to the minimum position Adjust the output level No sound is generated on one side The connecting cable is not connected on one side only Make cable connections securel...

Page 18: ...16 MEMO...

Page 19: ......

Page 20: ...LUXMAN CORPORATION JAPAN AG00987E21A Printed in China...

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