Luxman L-505uXII Integrated Amplifier



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The L-505uXII is the eagerly awaited Mark II version of the popular L-505uX that has been at the forefront of pre-amplifier design. Incorporating an abundance of proprietary technologies, such as Luxman's Version 4.0 ODNF (Only Distortion Negative Feedback), as well as LECUA (Luxman Electronically Controlled Ultimate Attenuator), this product is a truly multifunctional integrated amplifier.

ODNF* Version 4.0 - Innovative amplification feedback circuit

An integral part of the design is LUXMAN's original ODNF amplification feedback circuit featuring a high-speed primary slew rate, an ultra-wide bandwidth and a low level of distortion that is achieved by feeding back only the distorted components of the audio from the amplifier's output circuit. It is equipped with the latest Version 4.0 ODNF circuit, resulting in a dramatically enhanced accuracy in distortion detection due to the paralleled first stage and Darlington equipped second stage amplification circuit, as well as a paralleled first stage error detection circuit. With it's lower impedance and higher S/N ratio, the L-505uXII realizes accurate reproduction of even the gentlest audio signals and achieves a full range of dynamic musical expression. The output stage, with it's parallel push-pull structure, has secured sufficient power at 100W+100W(8Ω) and 150W+150W(4Ω).

Highly accurate LECUA computerized attenuator

LECUA (Luxman Electronically Controlled Ultimate Attenuator) is at the heart of the pre-amplifier section and the sound volume adjustment function. The design also uses a solid state(IC) type circuit to achieve a significant reduction in size. LECUA provides an ideal level control mechanism that allows smooth and fine volume adjustment over 88 steps, thereby minimizing any deterioration of the audio signal. In addition, left and right balance adjustment is integrated into the attenuator's control functions. The multifunctional ability of LECUA ensures accuracy over the full range of the volume control, while suppressing any deterioration of sound quality. The volume may also be adjusted with the remote control, but when adjusting the volume manually, the tactile design and gradual motion of the control itself enables intuitive adjustment of the attenuation level.

It features a new discrete buffer circuit in the output stage of the pre-amplifier circuit that is equivalent to the type used in our high-end C-900u separate amplifier. The pre-amp output stage is able to drive the signal with enhanced current supply capacity. The clarity of the audio signal is protected, while the driving force fed through to the power amplifier stage is significantly increased. The power and reproduction capability achieves overwhelming scale sensitivity and a sharpness on start-up that cannot be achieved by conventional pre-amplifiers.

High stability power supply

The power supply consists of an EI core type power transformer, highly regulated, with four large capacity 10,000μF blocking capacitors creating a highly stable power supply. This ensures an instantaneous, constant and stable current supply.

Low impedance transmission

Large-capacity, low resistance speaker relays are connected in parallel to enable lossless transmission for the powerful driving force that is generated by the large-scale output circuit. In addition, the damping factor has been improved from 180 to 210 by lowering the impedance of the wiring pattern.

Original technologies prioritize sound quality

LUXMAN uses an original Beeline construction that features a non-angled wiring pattern to allow smooth signal transmission along the shortest optimal route.

A wide variety of custom-made components for high sound quality components for high sound quality

OFC cabling is used in the internal wiring, achieving natural signal transmission due to the spirally wrapped shielding on each non-plated wire core. A high quality input selector IC is employed to improve separation and eliminate crosstalk.

An abundance of user-friendly functions

The amp is equipped with a high quality phono pre-amplifier that is compatible with MM and MC cartridges.

Specifications
Rated output 100W + 100W (8Ω),
150W + 150W (4Ω)
Input sensitivity/input impedance PHONO (MM): 2.5mV/47kΩ
PHONO (MC): 0.3mV/100Ω
LINE: 180mV/47kΩ
BAL.LINE: 180mV/55kΩ
MAIN-IN: 1V/47kΩ
Output voltage REC OUT: 180mV, PRE-OUT: 1V
Frequency response PHONO: 20Hz to 20kHz (within -3dB)
LINE: 20Hz to 100kHz (within -3dB)
Total harmonic distortion 0.009% or less (8Ω, 1kHz)
0.09% or less (8Ω, 20Hz to 20kHz)
S/N ratio (IHF-A) PHONO (MM): 91dB or more
PHONO (MC): 75dB or more
LINE: 104dB or more
Volume adjustment LECUA
Amplification circuit ODNF 4.0
Output configuration Bipolar parallel push-pull
Damping factor 210
Max. amount of tone control BASS: ±8dB at 100Hz
TREBLE: ±8dB at 10kHz
Power supply 230V~(50Hz) / 115V~(60Hz)
Power consumption 270W
85W (under no signal), 0.4W (at standby)
External dimensions 440(W) x 178(H) x 454(D) mm
front side knob (20mm) and rear side terminal
(27mm) included in depth

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