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Luxman
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C-900U
User Manual
36 pgs1.2 Mb1

Luxman C-900U User Manual

CONTROL AMPLIFIER
C-900u
Owner`s Manual
Contents
CONTROL AMPLIFIER C-900u
Precautions
Installation place
Install this unit in a location where good ventilation and heat
radiation is assured.
Especially, installation of this unit where direct sunlight is
present, where the temperature rises excessively high such
as close to a heater, or where it is humid or dusty may cause
a malfunction even if heat is efficiently released. Therefore, do
not install this unit in such places.
Note:
For heat dispersal, do not install this equipment in a confined
space such as a book case or similar unit.
* Note
* *
*
Wall
Batteries
Caution:
Batteries used for remote controller shall not be exposed to
excessive heat such as sunshine, fire or the like.
Repair and adjustment
When repair and adjustments are needed, please ask the
store where you bought the unit.
Cleaning
For cleaning, use a piece of soft cloth to wipe the unit such as
cleaning cloth available on the market. If the unit has become
very dirty, remove the dirt with soft cloth absorbing a small
amount of neutral detergent, and then wipe the unit with dry
cloth. Do not use a solvent like benzine or thinner because
such a substance can often damage the exterior.
Precautions in connecting with other components
When connecting this unit to input/output devices, be sure to
turn off the power switches of this unit and all other connect-
ed units. Failure to observe this may generate a strong noise
resulting in speaker damage or cause a malfunction.
The pin-plugs to be inserted in the input and output terminals
of this unit shall be pushed in firmly. If the grounding termi-
nal is inadequately connected, noises including hum may be
generated, resulting in an adverse S/N ratio.
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 circuit. Therefore, no sound is generated
shortly after the power supply is turned on.
If the volume control is moved to a high sound level before
the time muting circuit is canceled, a large sound is suddenly
generated. Please be advised that the volume control shall be
set to a low level at first and adjusted after sound comes out
of the speakers.
1
Features of This Unit
LECUA1000 — LUXMAN Electric Controlled Ultimate Attenuator 1000
Application of the system to obtain attenuation by combining
2 fixed resistances connected in series has improved the effi-
ciency of the LECUA1000 attenuator used in C-1000f.
The shortest signaling route has been achieved by the in-
tegrated amplifier circuit thanks to the 3D structure of the
mounting boards.
Controlling LECUA1000 to the level equal to the volume po-
sition detected by a microprocessor has achieved the oper-
ation feeling similar to our conventional sliding-type volume
controls.
ODNF - Only Distortion Negative Feedback -
The amplification feedback circuit that has acquired the high-
speed primary slew rate and ultra-wide bandwidth by feeding
back only distortion components generated during amplifica-
tion to maintain the pure sound quality of the main-amplifier
that is almost non-feedback.
The newest version, 4.0, has achieved the low impedance
and high S/N ratio of the transmission circuit thanks to 4-par-
allelized first stage and Darlington-connected second stage
of the amplification circuit.
In addition, the input stages of the error detection circuit are
3-parallelized to improve distortion and noise.
High-inertia power supply
High-inertia power supply circuit that combines a large-ca-
pacity OI-core-type power transformer with customizable
3,300μF × 4 capacitor blocks.
Schottky barrier diode
Application of schottky barrier diode manufactured by Nihon
Inter Electronics Corporation that has less switching noises
and higher conversion efficiency to the DC voltage for the
power supply rectifier circuit.
LUXMAN’s original OFC wires
Our original OFC wires are used in the internal wiring to
achieve smooth signal transmission thanks to the spiral wrap
shielding on each core and the non-plating process on the
core wire.
Loopless chassis structure
This unit consists of the independent construction of a
loopless chassis to eliminate increased ground impedance
caused by chassis current.
2
CONTROL AMPLIFIER C-900u
Zoom function
When the ZOOM button on the remote control is pressed, the
current volume level is enlarged on the display.
Dimmer function
The brightness of display window can be switched over in 4
steps.
Peel coat, PCB
Dielectric effect of resist eliminated by using copper foil of
100μm in thickness and gold plating on audio circuit board
instead of using resist.
Input/output terminals
RCA terminal made of copper alloy and XLR terminal manu-
factured by Neutrik.
Remote control (RA-20)
The remote control is encased in aluminum. Tactile switches
will satisfy users with solid click feeling.
Tactile switches will satisfy users with light key touch.
Cast-iron insulator
This unit is equipped with gradation cast-iron insulators that
cuts out unnecessary external vibration and strongly supports
the weight of this unit.
External pre-input terminal
External pre-function capable of switching between external
pre-amplifier and AV amplifier.
Selector relay
Selector relay with high sound quality used in the key point of
Luxman amplifier, which enhances the separation and cross-
talk performances.
3
Names and Functions
678912 1011
51 2 43
Front panel
1. Operation switch (OPERATION)
Turns this unit from the standby state 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.
2. Operation indicator (OPERATION)
Blinks during warm-up when the operation switch is turned
on and lights up when the operation state is activated af-
terward.
3. Input selector (INPUT SELECTOR)
Selects the unbalanced input terminal or balanced input ter-
minal, both of which are located on the rear panel.
• Input transition by rotating clockwise:
→LINE-2→LINE-3→BAL LINE-1→BAL LINE-2→
LINE-1 BAL LINE-3→LINE-1...
• Input transition by rotating counterclockwise:
→BAL LINE-3→BAL LINE-2→BAL LINE-1→
LINE-1 LINE-3→LINE-2→LINE-1 …
Factory default: LINE-1
The input/output muting circuit is activated to mute sound
during selecting an input.
4. Display window
Displays the operation status of this unit.
This display window is composed of 8 indicators, input dis-
play, and volume display.
5. Volume control (VOLUME CONTROL)
Adjusts the sound volume.
Sound is not generated when this control is rotated coun-
terclockwise to the end, and then, the sound volume grad-
ually becomes higher when the control is rotated clockwise
as follows: mute
1 dB.
→-87 dB→-86 dB→..→0 dB in steps of
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CONTROL AMPLIFIER C-900u
6. External pre switch (EXT PRE)
Input selector switch to select the external pre-input termi-
nal (EXT PRE) on the rear panel
ON: Allows the output signals coming from the pre-ampli-
fier or AV amplifier connected to the external pre-in-
put terminal to be provided directly from the unbal-
anced terminal.
OFF: Enables to reproduce the signals from the source se-
lected with the input selector.
Holding down the switch for approx. 1 second toggles the
external pre switch ON and OFF.
When the external pre switch is set to ON, the external pre
indicator lights up.
When the main power switch is turned off or this unit is
in the standby state, external pre-input signals are always
provided from the unbalanced output terminal regardless of
this switch setting.
The input signals connected to the external pre-input ter-
minal are not provided from the balanced output terminal.
When the external pre switch is set to ON, the volume con-
trol of this unit cannot adjust the sound volume.
Volume adjustment shall be performed at the input device
side such as the pre-amplifier connected to the external
pre-input terminal.
7. Output mode selection switch (OUTPUT MODE)
Selects an output mode from the following 3 kinds: unbal-
anced output, balanced output, and bi-amplifier output
Every time this switch is pressed, the output changes as
follows: UNBAL
• Unbalanced output (UNBAL)
Sound comes out from LINE-1 and LINE-2.
• Balanced output (BAL)
Sound comes out from BAL LINE-1 and BAL LINE-2.
• Bi-amplifier output (BI-AMP)
Sound comes out from LINE-1 and LINE-2.
LINE-1 (Lch): LOW (Lch)
LINE-1 (Rch): LOW (Rch)
LINE-2 (Lch): HIGH (Lch)
LINE-2 (Rch): HIGH (Rch)
When the input selector is set to balanced, the bi-amplifier
output cannot be selected.
Change the output mode after setting the input selector to
unbalanced.
Factory default: Unbalanced output (UNBAL) mode
The input/output muting circuit is activated to mute sound
during selecting an output mode.
Every output mode can store preset values, respectively.
Refer to the descriptions about presetting on pages 22 to
25 for presetting.
→BAL→BI-AMP→UNBAL ...
If a device that has no volume adjustment function such as
a CD player is connected to the external pre-input terminal,
the volume control of this unit cannot function, and there-
fore, sudden loud sound may be generated when the exter-
nal pre-input is selected, which may cause hearing loss or
damage to the speakers.
For such input devices, be sure to use a pre-amplifier
equipped with the sound volume adjustment function as
a relay, generate sound through the speakers with volume
lowered, and adjust the volume to your favorite level.
8. Balance control (BALANCE)
Adjusts the balance of sound volume between right and left
channels.
Rotating this control counterclockwise causes the left sound
volume to be enhanced, and rotating this control clockwise
causes the right sound volume to be enhanced.
This control shall be set to the center position under normal
conditions, and rotated to make adjustment if necessary.
The adjustable value for right/left balance is up to -6 dB for
right and left each.
9. Remote sensor (REMOTE)
Receives signals from the accessory remote control.
5
Names and Functions
678912 1011
51 2 43
Front panel
10. Tone control for treble TONE CONTROL (TREBLE)
Controls the frequency characteristics in the high-frequency
range.
When this control is set to the center position, flat frequency
characteristic is obtained. Rotating this control clockwise
causes the high-frequency range to be enhanced, and ro-
tating this control counterclockwise causes the high-fre-
quency range to be attenuated.
This control does not function when the line straight switch
is set to ON.
11. Tone control for bass TONE CONTROL (BASS)
Controls the frequency characteristics in the low-frequency
range.
When this control is set to the center position, flat frequency
characteristic is obtained. Rotating this control clockwise
causes the low-frequency range to be enhanced, and rotat-
ing this control counterclockwise causes the low-frequency
range to be attenuated.
This control does not function when the line straight switch
is set to ON.
12. Line straight switch (LINE STRAIGHT)
This switch is used to increase the purity of the sound qual-
ity by bypassing (skipping) the tone control circuit.
Every time this switch is pressed, line straight setting tog-
gles between ON and OFF repeatedly.
The line straight indicator lights up when the line straight
switch is set to ON.
When the line straight switch is set to ON, the tone control
and loudness do not function.
6
CONTROL AMPLIFIER C-900u
7
Names and Functions
6 75 9
1
324
11108
Display window
1. Input indicator (IN:)
Displays the input terminal selected with the input selector
or remote control.
2. Volume indicator (VOL:)
Indicates the current volume level in steps of 1 dB.
• “- -“ shows the mute state. No sound is generated.
• The minimum volume level is shown as “–87 dB”, and the
maximum volume level is shown as “0 dB”.
3. Loudness indicator (LOUDNESS)
Lights up when the loudness switch on the remote control
is set to ON.
5. Standby indicator (STAND BY)
Lights up when the main power switch on the rear panel is
turned on and the operation switch is turned off.
When the operation switch is turned on or when the main
power switch is turned off, this indicator turns off.
6. Unbalance indicator (UNBAL)
Lights up when the unbalanced output terminal is selected
for the output mode.
7. Remote sensor (REMOTE)
Receives signals from the accessory remote control.
4. Balance indicator (BAL)
Lights up when the balanced output terminal is selected for
the output mode.
8
CONTROL AMPLIFIER C-900u
8. Bi-amplifier indicator (BI-AMP)
Lights up when the bi-amplifier output is selected for the
output mode.
9. Balanced phase inversion indicator (BAL INVERT)
Lights up when the phases of the balanced input and bal-
anced output are inverse against the preset state of this
unit.
11. Line straight indicator (LINE STRAIGHT)
Lights up when the line straight switch is set to ON.
When the line straight switch is set to ON, the loudness
function cannot be operated from the accessory remote
control.
If this switch is pressed, the line straight indicator blinks for 3
seconds to show that this operation cannot be performed.
Perform the loudness function after setting the line straight
switch to OFF.
10. External pre indicator (EXT PRE)
Lights up when the external pre switch is set to ON.
The loudness function can be toggled ON and OFF only with
the accessory remote control (RA-20).
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