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Luxman C-700u Stereo Preamplifier

by Luxman

Luxman C-700u Stereo Preamplifier


The C-700u control amplifier is Luxman's new middle of the range model that inherits some of our magnificent innovations, seen in their high end model, the C-900u, including our latest ODNF version 4.0 circuit, with significantly improved distortion characteristics and signal to noise performance and our new LECUA 1000, a computerized attenuator directly connected to the amplifier circuit, which enables smooth volume changes without any deterioration of sound quality. They are pursuing the concept of a simple and high quality control amplifier, exclusively designed for line level signals. What is more, this unit is also multifunctional, the loudness function interacting with the volume and tone controls, external pre-input connectivity and a fluorescent display with zoom and dimmer controls. Features like these make the C-700u suitable for the control center of your system, a new-generation of control amplifier, displaying performance consistent with high level functionality.

New LECUA 1000 and ODNF version 4.0

Just like Luxman's top of the range model, the C-900u, the C-700u features the new LECUA 1000 high precision electronically controlled attenuator in an unbalanced configuration. An accurate volume adjustment mechanism is fundamental to the operation of a control amplifier. The LECUA* system is extremely resistant to external vibration and changes in sound quality over the volume control range, as well as being an extremely durable design. The LECUA circuit uses stepped fixed resistance and increasing the number of steps from 72 to 88 allows more delicate volume control adjustments from 0dB to 87dB with no deterioration of sound quality. This circuit also accurately handles any left and right balance adjustments. Their latest negative feedback circuit, ODNF** version 4.0, achieves even higher performance by being quadruple paralleled in the first main amplifier stage, triple paralleled in the first error detection stage and featuring a Darlington connected second stage. Only the distorted components of the audio signal are fed back to the amplification circuit to optimize the negative feedback effect. Increased primary slew rate and ultra-wide bandwidth contribute to an extremely low level of distortion, especially in the high frequency range. An improved signal to noise ratio allows the full expression of delicate musical pieces where the amount of feedback should be minimal.* LECUA stands for "LUXMAN Electrically Controlled Ultimate Attenuator".** ODNF stands for "Only Distortion Negative Feedback".

Large capacity power supply

In order to embody the philosophy of "Power Amplifier Driver", meaning a component which powerfully drives a power amplifier connected in the next stage, the C-700u has a large capacity power supply featuring an OI-type power transformer and is regulated by two 3,300μF blocking capacitors. This circuit creates a firm power base to support the sound quality of the C-700u.

Zoom display mode

The highly visible fluorescent display is equipped with a dimmer and has a four level zoom mode, adjusted via the remote control. The two part display usually displays the input source and volume level and is also eye-friendly and clearly visible from the listening position.

External pre-input terminals and balanced phase selection

The C-700u is equipped with unbalanced external pre-amp input terminals to which an external pre-amplifier in your AV system may be connected. The balanced inputs have the option of phase switching (pin no.3 HOT to pin no.2 HOT) which can be adjusteded and memorized for each balanced input. This is useful for connecting to units made by other manufacturers.



Input sensitivity/Input impedance Unbalanced 250mV/46kΩ
Balanced 250mV/67kΩ
Output/Input impedance Unbalanced rating 1V/90Ω, max. 11V
Balanced rating 1V/600Ω, max. 11.5V
Frequency response 20Hz to 20kHz (+0, -0.1dB)
5Hz to 120kHz (+0, -3.0dB)
Total harmonic distortion Unbalanced 0.007% (20Hz to 20kHz)
Balanced 0.010% (20Hz to 20kHz)
S/N ratio (IHF-A) Unbalanced 125dB
Balanced 122dB
Volume adjustment New LECUA1000
Negative feedback circuit ODNF 4.0
Max. tone control range BASS: ±8dB at 100Hz
TREBLE: ±8dB at 10kHz
Remote control functions ・Operation・Dimmer・ Input selector
・Output mode・Balanced phase selection
・Record output・External pre-input
・Line straight・Loudness・Volume up/down
Power consumption 28W
2.0W (in standby mode)
External dimensions 440(W) x 130(H) x 430(D) mm
(including 17mm front panel knob and 14 mm rear panel speaker terminals)
Net weight 14.6 kg
Accessories Remote control (RA-22)
Power cable

* Reprint from Manufacturer's website