How it Works
Luxman
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C-700U
User Manual
32 pgs964.5 Kb0

Luxman C-700U User Manual

CONTROL AMPLIFIER
C-700u
Owner`s Manual
Contents
CONTROL AMPLIFIER C-700u
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
dealer where you bought the unit.
Cleaning
For cleaning, use a piece of soft cloth to wipe the unit such as
cleaning cloth. When the dirt is hard to remove, use a small
amount of neutral detergent to wipe, 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 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 set 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 the 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 ampli-
fier 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 for the main amplifier to maintain the pure sound quality
that is almost non-feedback.
With ODNF’s latest version 4.0, in the amplification circuit,
the first stage is 4-parallelized and the second stage is con-
nected with Darlington. Due to these improvements, the low
impedance and high S/N ratio of the transmission circuit have
become possible.
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 ca-
pacitor blocks.
Schottky barrier diode
In the power supply rectifier circuit, schottky barrier diode
manufactured by Nihon Inter Electronics Corporation that has
less switching noises and higher conversion efficiency to the
DC voltage is applied.
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 processing on the
core wire.
Loopless chassis
The independent construction of a loopless chassis structure
eliminates the rise of increased ground impedance caused by
chassis current.
AC inlet
This inlet enables the connection with an external power ca-
ble.
2
CONTROL AMPLIFIER C-700u
Zoom function
When the ZOOM button on the remote control is pressed, the
current volume level is enlarged on the display.
Remote control (RA-22)
The remote control is encased in aluminum. Tactile switches
will satisfy users with “clicking” key touch.
Dimmer function
The brightness of the display window can be switched over
in 4 steps.
Round pattern board
In consideration of the delicate audio signal flow, circuit
boards are round-patterned for the smooth current flow.
Input/output terminals
Introduction of 18 mm pitch RCA input terminals and an XLR
terminal manufactured by Neutrik allows even a high-perfor-
mance line cable with large plug to be connected.
Cast-iron insulator
The gradation cast-iron insulator that clears unnecessary ex-
ternal vibration and strongly supports the weight of this unit
is equipped.
External pre-input terminal
External pre-input terminal is equipped to select an input from
external pre-amplifier or AV amplifier etc.
Selector relay
Selector relay with high sound quality used in Luxman ampli-
fiers enhances the separation and crosstalk performances.
3
Names and Functions
67891213 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.
Pressing this switch again at the operating state turns the
unit to the standby 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→LINE-4→LINE-5→BAL LINE-1
LINE-1
→BAL LINE-2→LINE-1...
• Input transition by rotating counterclockwise:
→BAL LINE-2→BAL LINE-1→LINE-5→LINE-4→
LINE-1 LINE-3→LINE-2→LINE-1 …
Factory default: LINE-1
During input selecting operation, input/output muting circuit
is in operation and the unit will be on mute.
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.
When this control is rotated counterclockwise to the end,
the unit is on mute. The sound volume gradually becomes
higher when the control is rotated clockwise as follows:
→-87 dB→-86 dB→..→0 dB in steps of 1 dB.
mute
4
CONTROL AMPLIFIER C-700u
6. External pre switch (EXT PRE)
Input selector switch to select the external pre-input termi-
nal (EXT PRE) on the rear panel
ON: Outputs sound signals connected to EXT Pre terminal
(pre-amplifier, AV amplifier etc.) directly.
OFF: Plays back a sound source selected by the input se-
lector.
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 ex-
ternal pre-input terminal 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.
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 or the
like equipped with the sound volume adjustment function.
After checking the sound through the speakers with volume
lowered, adjust the volume to your favorite level.
When changing the connected devices, be sure to turn off
the main power switch or set the unit to the standby state.
7. Output mode selection switch (OUTPUT MODE)
Selects an output mode from the following 3 kinds: unbal-
anced output, balanced output, and both (unbalanced +
balanced) output.
By pressing this switch, the output changes as follows: UN-
→BAL→BOTH→UNBAL ...
BAL
• 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.
• Both output (BOTH)
The unbalanced outputs, LINE-1 and LINE-2, and the
balanced outputs, BAL LINE-1 and BAL LINE-2, provide
audio output.
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 20 to
21 for presetting.
8. Balance control (BALANCE)
Adjusts the balance of sound volume between right and left
channels.
Rotating this control counterclockwise makes the left sound
volume enhanced, and rotating this control clockwise
makes the right sound volume enhanced.
This control shall be set to the center position under normal
conditions, and rotate 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 remote control.
5
Names and Functions
67891213 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
makes the high-frequency range enhanced, and rotating
this control counterclockwise makes the high-frequency
range 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
makes the low-frequency range enhanced, and rotating this
control counterclockwise makes the low-frequency range
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.
By pressing this switch, line straight setting toggles be-
tween 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.
13. Monitor switch (MONITOR)
This switch is to activate the monitor input terminal.
ON: Plays back a source from the recorder.
OFF: Plays back a sound source selected by the input se-
lector.
By pressing this switch, the monitor switches from on to off.
6
CONTROL AMPLIFIER C-700u
7
Names and Functions
6 75 9
1
324
11108
Display window
1. Input indicator (IN:)
Displays the input terminal selected by the input selector or
the 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 shown is “–87 dB”, and the
maximum volume level shown is “0 dB”.
3. Loudness indicator (LOUDNESS)
Lights up when the loudness switch on the remote control
is set to ON.
4. Balance indicator (BAL)
Lights up when the balanced output terminal is selected for
the output mode.
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 remote control.
8
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