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Luxman P-750u Headphone Amplifier

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To be better than the best, this was LUXMAN's challenge when developing the P-750u headphone amplifier, a new flagship.

The P-750u  is a meticulously refined evolution of LUXMAN's P-700u, itself a highly respected, industry standard, high-end headphone amplifier, revered by many headphone listeners. Central to the design of this headphone amplifier is LECUA (LUXMAN Electronically Controlled Ultimate Attenuator), a high fidelity computer controlled attenuator which we feel is the ideal volume adjustment system. The P-750u also features ODNF Version 4.0 (Only Distortion Negative Feedback), a proprietary LUXMAN feedback circuit integral to this perfectly balanced headphone amplifier. The addition of a 4-pin XLR balanced headphone output to the P-750u completes the evolution by extending the choice of compatible headphones and elevating the listening experience for even the most ardent headphone users to uncharted heights.  

To be better than the best, this was LUXMAN's challenge when developing the P-750u, a new flagship headphone amplifier

The P-750u is a meticulously refined evolution of LUXMAN's P-700u, itself a highly respected, industry standard, high-end headphone amplifier, revered by many headphone listeners. Central to the design of this headphone amplifier is LECUA (LUXMAN Electronically Controlled Ultimate Attenuator), a high fidelity computer controlled attenuator which we feel is the ideal volume adjustment system. The P-750u also features ODNF Version 4.0 (Only Distortion Negative Feedback), a proprietary LUXMAN feedback circuit integral to this perfectly balanced headphone amplifier. The addition of a 4-pin XLR balanced headphone output to the P-750u completes the evolution by extending the choice of compatible headphones and elevating the listening experience for even the most ardent headphone users to uncharted heights.  

LUXMAN's LECUA computerized attenuator is a highly accurate sound volume adjustment system

During headphone playback, audio signals are instantaneously delivered to both ears. Issues caused by level deviation between left and right channels at low sound volumes or differences in sound quality over the volume range are difficult to solve using a conventional analog volume adjustment system. The design of the P-750u features a solid state (IC) circuit, achieving a significant reduction in size, together with the LECUA computerized attenuator, which we believe is the ideal level control system. The incredibly smooth volume control operation of the P-750u minimizes level deviation between the left and right channels at low volume and eliminates loss of sound quality at any volume setting. This multifunctional amplifier suppresses the deterioration of sound quality by offering three selectable levels of sensitivity, depending on the impedance and efficiency of the headphones, and by integrating left/right balance adjustment with LECUA.  

BTL balanced drive and paralleled unbalanced drive

The P-750u is equipped with ODNF Version 4.0, the latest generation of LUXMAN’s original high sound quality amplification feedback circuit on each of the four identical output channels. Utilizing a BTL balanced output configuration enables a great improvement in left-right separation, sound localization and power supply regulation, whilst cross-modulation distortion is also significantly reduced. The listener can enjoy the maximum benefits of balanced connection headphones. When using unbalanced headphones, the four channel amplification circuitry is divided into 2 channels each for left and right, driving each in parallel, thereby doubling the output current supply capacity. This improves absolute driving force and intensifies sound reproduction with dynamic intonation. An enhanced sound stage can be enjoyed with a rich range and the superb detail that is characteristic of a balanced connection whilst maximizing the performance of the headphones.  

A choice of high quality output connections

The P-750u features a choice of headphone outputs including a standard stereo jack (unbalanced) output terminal, a stereo pair of balanced 3-pin XLR terminals with the addition of a 4-pin XLR balanced terminal for compatibility with high-end headphones.  

Enhanced high capacity power supply

The design of the P-750u is enhanced further with the inclusion of a highly stable power supply circuit consisting of a highly regulated OI-core power transformer, two 10,000μF custom block capacitors in the power amplifier stage and two 3,300μF custom block capacitors in the pre-driver stage thus achieving immense power and stability.  

Original technologies

To realize a smooth, stress free signal transmission, LUXMAN's original Beeline construction is utilized. This allows the wiring and signal transmission to take the shortest optimal route (like the homing route of a bee). Our non-angled wiring pattern with straight and smoothly curved traces on the circuit board also contribute to the smooth passage of audio signals.  

Control functions integrated with LECUA

In addition to the 3-step sensitivity selection, allowing the output sensitivity to be chosen according to various headphones, the P-750u also features a left-right balance adjustment control. Both functions are controlled by LECUA, a high quality computerized attenuator, to minimize the deterioration of sound quality over the volume control range.  

Highly rigid chassis and a refined design

The dual design of the base chassis, constructed from 3mm sheet steel, maximizes rigidity and makes the center of gravity lower. A mirrored, rhodium plated logo plate on the front panel combines beautifully with the blaster white metallic cabinet for a truly refined finish.  

Customized legs

Gradation cast iron legs that are used for the LUXMAN 900 series separate amplifier have been customised for the P-750u, taking thorough countermeasures against vibration.

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