Luxman 505uXII Integrated Amplifier

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The Luxman L-505uXII is a high-end integrated amplifier that offers a new level of refinement and performance. As the successor to the popular L-505uX, which was launched in 2011, the L-505uXII incorporates many proprietary technologies that aim to improve its overall performance.

One of the key technologies used in the L-505uXII is Luxman's Version 4.0 ODNF (Only Distortion Negative Feedback) circuit. This innovative amplification feedback circuit is designed to detect and feedback only the distorted components of the audio signal, which results in a lower level of distortion and improved accuracy in the audio reproduction. The Version 4.0 ODNF circuit in the L-505uXII is even more advanced than its predecessor and makes use of a paralleled first stage and Darlington-equipped second stage amplification circuit, as well as a paralleled first stage error detection circuit. This improved circuit design enables the L-505uXII to achieve a high-speed primary slew rate, an ultra-wide bandwidth, and a low level of distortion.

Another important technology used in the L-505uXII is the LECUA (Luxman Electronically Controlled Ultimate Attenuator) circuit. This circuit is at the heart of the pre-amplifier section and the sound volume adjustment function of the L-505uXII. It uses a solid-state (IC) type circuit to achieve a significant reduction in size and provides an ideal level control mechanism that allows for smooth and fine volume adjustment over 88 steps. This minimizes any deterioration of the audio signal, and 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 L-505uXII also features a new discrete buffer circuit in the output stage of the pre-amplifier circuit, which is equivalent to the type used in Luxman's high-end C-900u separate amplifier. This circuit is able to drive the signal with enhanced current supply capacity, protecting the clarity of the audio signal while increasing the driving force fed through to the power amplifier stage.

To ensure an instantaneous, constant, and stable current supply, the power supply of the L-505uXII consists of an EI core type power transformer, highly regulated, with four large capacity 10,000μF blocking capacitors. 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.

All these advanced technologies come together to make the L-505uXII a truly multifunctional integrated amplifier that exudes sophistication and authenticity beyond its class. Its ability to accurately reproduce even the gentlest audio signals and achieve a full range of dynamic musical expression make it stand out as a top-of-the-line model for audiophiles looking for the best audio quality.

Technical Specifications