The L-507uXII integrated amplifier earns its Mark II status by combining the knowledge and experience of developing refined pure Class A integrated amplifiers with state of the art technology. The L-507uXII features the New LECUA 1000 attenuator and a discretely configured buffer circuit as well as the Version 4.0 ODNF ( Only Distortion Negative Feedback ) original feedback circuit from Luxman to achieve spatial expression, overwhelming power and clarity that is comparable to a separate amplifier. Technology has progressed but the philosophy remains the same.The L-507uXII represents a quantum leap in integrated amplifier design and reflects the global perception of Luxman as the leader in brilliant audio expression and reproduction

New LECUA*1000 Computerised Attenuator

The New LECUA1000 is the most important part of the pre-amplifier section and handles volume adjustment of sound signals at micro levels. A computerized attenuator, the New LECUA1000 is an integral part of the amplifier circuit and performs in the same way as the high-end C-900u LUXMAN control amplifier. The New LECUA1000 enables the volume to be adjusted smoothly and finely in 88 steps thereby minimizing the deterioration of the sound quality. In addition, a 3D layout has been introduced in the New LECUA1000 allowing the substrates to be placed in three dimensions. A direct connection between the attenuator circuit and amplification circuit is made to minimize the signal transmission route and improve efficiency. What is more, this type of design is insensitive to external vibration, eliminates any change in sound quality depending on the position and durable so that it will not decline with the passage of time.
*LECUA stands for "Luxman Electronically Controlled Ultimate Attenuator".

ODNF* Version 4.0 Innovative Amplification Feedback Circuit

An integral part of the design of the L-507uXII is LUXMAN’s original ODNF amplification feedback circuit. This features a fast-primary slew rate and an ultra-wide bandwidth that is achieved through the feedback of distortion components only from the amplification output circuit. The latest version of ODNF–Version 4.0–is used, resulting in a dramatic enhancement of accuracy in distortion detection, lower impedance and a higher S/N ratio due to a parallel first stage and Darlington connected second stage of the amplification circuit, as well as a 3-parallel first stage error detection circuit. A 3-parallel push-pull structure output stage achieves complete output linearity of 110 Watt+110 Watt ( @ 8Ω ) and 210 Watt +210 Watt ( @ 4Ω ). This type of circuit can achieve high power ratings that are comparable to a separate amplifier and has the force to drive various speaker systems to deliver high grade sound reproduction.
*ODNF stands for "Only Distortion Negative Feedback".

Discrete Buffer Circuit

The L-507uXII features a new discrete,embedded buffer circuit mounted on the output stage of the pre-amplifier circuit that is equivalent to the type used in the high-end C-900u. This helps to protect the purity of the audio signal whilst enhancing the drive force of the power amplifier unit.

An Abundance of User-friendly Functions

The L-507uXII is equipped with a high-quality phono amplifier that is compatible with MM/MC cartridges. This model offers all the functions that a high quality integrated amplifier should offer such as bass/treble tone control, LR balance adjustment using LECUA, pre/power separation function, volume function and headphone output to name a few.