Luxman Control Amplifier

For uppermost tone quality.

C-900u was newly created for the pursuit of the uppermost tone quality. The balanced amplification circuit having 4-module configuration in which the right/left and HOT/COLD of sound signals are set to be independent is introduced to suppress unnecessary noise generation. Combination of the evolved traditional ODNF circuit version 4.0 and powerful power supply unit has achieved high S/N performance sound quality without distortion. Luxman's original fixed resistance switching type attenuator, the latest version of "LECUA 1000", is used for the volume adjustment mechanism that is the major key of the control amplifier. The number of contacts is set to 88 to allow the more precise volume adjustment to be performed. This product is appropriate for calling the modern control center because of its elegant design with user-friendliness, the tone control function, premium operation feeling, and more.               

New LECUA 1000 with Fully Balanced Configuration, Attenuator with Discrete Configured ODNF Amplifier Directly Coupled

• It can be said that the volume adjustment function is the core of a control amplifier. C-900u has been equipped with the high-precision attenuator that is electronically controlled and is switched by fixed resistance, which has been used in the Luxman's 80th anniversary flagship model, C-1000f, and also with the new LECUA 1000 that has been evolved from the amplification circuit integrated type, LECUA* 1000. This type is extremely insensitive to external vibration and change in sound quality depending on sound volume positions, and also significantly excellent in durability. Increase in the number of steps from 72 to 88 allows more delicate sound volume to be adjustable without deterioration of sound quality within 0 to 87 dB. The completely balanced configured C-900u is equipped with 4 units of these new LECUA 1000s in parallel, which has achieved ideal balanced transmission. Because LECUA 1000 control is used for balance adjustment between right and left and level adjustment in the bi-amplifier output mode, there is no need for concern about the deterioration of sound quality. In addition, 3D layout is introduced in new LECUA 1000 to allow substrates to be placed in three dimensions, and the attenuator circuit is directly connected to the amplification circuit, which lead to minimize routes and improve efficiency. Only distortion components are fed back to the amplification circuit to maximize the advantage of the NFB (negative feedback), and the primary slew rate speed indicating the startup performance, ultra-wide bandwidth, and the latest version of the ODNF* circuit that hasachieved lower distortion are adopted. The ODNF circuit version 4.0 has acquired higher performance by making the first stage of the main amplifier 4 parallels, second stage Darlington connection, and the first stage of the error detection amplifier 3 parallels. Delicate sound expression can be achieved by improving the S/N performance with the amount of feedback minimized, especially improving distortion characteristics at high frequencies remarkably. We have paid special attention to the shape, weightiness, and texture of the volume knob and pursued natural high quality feeling for it because the knob has the most opportunities to be touched by the user.
• LECUA is an abbreviation of Luxman Electric Controlled Ultimate Attenuator.      

Large-Capacity High-Inertia Power Supply Circuit

• The high-performance power supply circuit is configured, which consists of the CI type power transformer whose capacity is equivalent to the monaural power amplifier, B-1000f, for the voltage amplification stage under the philosophy of "Power Amplifier Driver" that drives the connected power amplifier precisely with sufficient power and a large-capacity block capacitor of 3,300μF x 4 units. The delicacy and powerfulness of sound signals are transmitted to the power amplifier with the support of the high-inertia power supply with remarkably high stability and almost no small voltage fluctuation.            

Compatibility Between User-Friendliness and Multifunction

• C-900u has been equipped with user-friendliness, flexibility, and expandability in accordance with system environment as well as multifunction. The FL display with high visibility can usually display inputs and sound volume in a 2-stage fashion, and also zoom in the contents 4 times larger with the remote control operation. This unit is equipped with the bi-amplifier output mode in which a balanced circuit can be used as a 2-channel unbalanced output, the external pre-amplifier input that is useful for coexistence with an AV system, and the tone control electronically controlled for sound quality.

Highly Rigid Cabinet Covered with Blasted White

• Highly rigid loopless chassis is used for the cabinet to eliminate ground loop that causes the deterioration of sound quality. Gradation cast-iron is selected for the legs to prevent resonance thanks to its characteristics of that the metallic structure becomes smaller from the center to the periphery of the leg. The legs eliminate adverse effects on the circuit parts caused by vibration from the power transformer or mounting surface. The blasted white exterior with no viewable structural screw adds a sense of high quality and dignified presence.             

Comfortable Remote Control Operation

• The remote control to be frequently used is made of aluminum with moderate weightiness. The remote control allows the user to operate a wide variety of functions of C-900u in a centralized manner with remaining seated to perform sound volume adjustment as a matter of course, the loudness function that automatically provides optimal balance adjustment in an auditory sensation according to sound volume, balanced phase presetting that can be set for each input system, the display dimming function (brightness switching), the zoom function that can be operated from some distance, and more.

Input Sensitivity/Input Impedance

• Unbalanced 255mV/43kΩ
• Balanced 255mV/86kΩ

Output/Input Impedance

• Unbalanced rating 1V/90, max. 11V
• Balanced rating 1V/180Ω, max. 22.5V

Frequency Response

• 20Hz to 20kHz (+0, -0.1dB)
• 5Hz to 120kHz (+0, -3.0dB)

Total Harmonic Distortion

• Unbalanced 0.009% (20Hz to 20kHz)
• Balanced 0.005% (20Hz to 20kHz)

S/N Ratio (IHF-A)

• Unbalanced 123dB
• Balanced 126dB

Volume Adjustment

• New LECUA1000

Amplification Circuit

• ODNF 4.0

Max. Change Amount of Tone Control

• Bass: ±8dB at 100Hz
• Treble: ±8dB at 10kHz

Remote Control Functions

• Operation, Dimmer, Input selector, Output mode, Balanced phase selection, Channel preset, External pre-amplifier input, Line straight, Loudness, Volume up/down, Mute, Zoom

Power Consumption

• 42W
• 2.2W (at standby)

External Dimensions

• 440(W) x 130(H) x 430(D) mm (front side knob of 17mm and rear side terminal of 14 mm included in depth)

Accessories

• Remote control (RA-20), Power cable