Luxman C-700U User Manual

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CONTROL AMPLIFIER

C-700u

Owner`s Manual

Contents

Precautions·············································································································· 1 Features of This Unit································································································ 2 Names and Functions······························································································ 4 Connections··········································································································· 12 Operations············································································································· 16 How to use Remote Control··················································································· 18 Block Diagram······································································································· 24 Specifications········································································································· 27 Before Asking for Repair Services··········································································· 28

Precautions

CONTROL AMPLIFIER C-700u

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.

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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 connected 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 terminal 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.

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.

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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 efficiency of the LECUA1000 attenuator used in C-1000f.

The shortest signaling route has been achieved by the amplifier circuit thanks to the 3D structure of the mounting boards. Controlling LECUA1000 to the level equal to the volume position detected by a microprocessor has achieved the operation feeling similar to our conventional sliding-type volume controls.

ODNF - Only Distortion Negative Feedback -

The amplification feedback circuit that has acquired the highspeed primary slew rate and ultra-wide bandwidth by feeding back only distortion components generated during amplification 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 connected 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 capacitor 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 cable.

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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.

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.

Remote control (RA-22)

The remote control is encased in aluminum. Tactile switches will satisfy users with “clicking” key touch.

Cast-iron insulator

The gradation cast-iron insulator that clears unnecessary external 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 amplifiers enhances the separation and crosstalk performances.

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Names and Functions

Front panel

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1. Operation switch (OPERATION)

3. Input selector (INPUT SELECTOR)

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 afterward.

Selects the unbalanced input terminal or balanced input terminal, both of which are located on the rear panel.

Input transition by rotating clockwise: LINE-1LINE-2LINE-3LINE-4LINE-5BAL LINE-1 BAL LINE-2LINE-1...

Input transition by rotating counterclockwise:

LINE-1BAL LINE-2BAL LINE-1LINE-5LINE-4 LINE-3LINE-2LINE-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 display, 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: mute-87 dB-86 dB..0 dB in steps of 1 dB.

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CONTROL AMPLIFIER C-700u

6. External pre switch (EXT PRE)

Input selector switch to select the external pre-input terminal (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 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 terminal are not provided from the balanced output terminal.

When the external pre switch is set to ON, the volume control 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 therefore, sudden loud sound may be generated when the external 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: unbalanced output, balanced output, and both (unbalanced + balanced) output.

By pressing this switch, the output changes as follows: UNBALBALBOTHUNBAL ...

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.

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Luxman C-700U User Manual

Names and Functions

Front panel

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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.

12. Line straight switch (LINE STRAIGHT)

This switch is used to increase the purity of the sound quality by bypassing (skipping) the tone control circuit.

By pressing this switch, line straight setting toggles 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.

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.

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 selector.

By pressing this switch, the monitor switches from on to off.

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CONTROL AMPLIFIER C-700u

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Names and Functions

Display window

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1. Input indicator (IN:)

4. Balance indicator (BAL)

Displays the input terminal selected by the input selector or the remote control.

Lights up when the balanced output terminal is selected for the output mode.

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.

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.

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