Luxman L-505uXII - Integrated Amplifier

The Luxman L-505uXII integrated amplifier is the successor to the popular L-505uX that has been at the forefront of pre-amplifier design since it's launch in 2011.

Utilising 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.

As Luxman's latest high-end model, the L-505uXII continues the evolution of the L-505 series, which has attracted many fans of audio quality and earned a great reputation. As an amplifier which exudes sophistication and authenticity beyond its class, the L-505uXII represents the latest in a long line of exemplary models.

Only Distortion Negative Feedback - ODNF Version 4.0

An integral part of the design of the L-505uXII is LUXMAN's original ODNF amplification feedback circuit. This features a high-speed primary slew rate, an ultra-wide bandwidth and a low level of distortion.

This is achieved by feeding back only the distorted components of the audio from the amplifier's output circuit.

The L-505uXII is equipped with the latest Version 4.0 ODNF circuit, resulting in a dramatically enhanced accuracy in distortion detection. This is 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 realises 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 sufficient power at 100w+100w (8Ω) and 150w+150w (4Ω).

Luxman Integrated Amplifier Comparison

Highly Accurate LECUA Computerised Attenuator

LECUA (Luxman Electronically Controlled Ultimate Attenuator) is at the heart of the pre-amplifier section and the sound volume adjustment function of the L-505uXII. The L-505uXII 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 minimising 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, whilst 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.

Discrete Buffer Circuit

The L-505uXII features a new discrete buffer circuit in the output stage of the pre-amplifier circuit that is equivalent to the type used in the 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, whilst at the same time, the driving force fed through to the power amplifier stage is significantly increased.

The power and reproduction capability of the L-505uXII achieves overwhelming scale sensitivity and a sharpness on start-up that cannot be achieved by conventional pre-amplifiers.

An Abundance of User-Friendly Functions

The L-505uXII is equipped with a high quality phono pre-amplifier that is compatible with MM and MC cartridges supporting full analog reproduction. This model offers all the functions that a high quality pre-main amplifier should offer such as bass/treble tone control, L/R balance adjustment using LECUA, pre/power separation function, volume function and headphone output to name a few.

Technical Specifications

Further Information

Luxman L-505uXII - User Manual