Luxman completes the Z Series line of integrated amplifiers with the introduction of the L-505Z. The new model represents the latest development in a series of 505 models going back to 2001’s L-505f, while introducing significant upgrades, including the Luxman Integrated Feedback Engine System (LIFES1.0) and the Luxman Electronically Controlled Ultimate Attenuator (LECUA).
The L-505Z is intended to replace the L-505uXII and completes the Z Series joining the L-507Z and 509Z. Upgrades from its predecessor also include an improved moving magnet/moving coil phono preamp, LECUA-controlled LR balance adjust function, 12-volt triggers, and parallel headphone output jacks, including a “Pentaconn” balanced type and 7-segment LED volume level-VU meter display.
Luxman Integrated Feedback Engine System
The LIFES1.0 power amp stage is the latest expression in Luxman’s multi-decade quest to combine the expressive power of negative-feedback-free amplifiers with the ultra-low distortion that feedback enables. Previously, feedback has been considered a double-edged sword. While it plays a central role in reducing distortion, even minuscule inaccuracies in its application can compromise musicality. It was to overcome this paradox that Luxman created the Only Distortion Negative Feedback (ODNF) circuit in 1999 and refined it through five generations up to 2021. LIFES1.0 supersedes even these achievements, with a completely redesigned circuit featuring improvements in distortion detection, regulation, and thermal stability. The result is a rare combination of low distortion and the natural sound quality associated with “non-feedback” type circuits.
The L-505Z combines high power and superb linearity thanks to bipolar transistors in triple-paralleled Darlington push-pull configuration. The highly regulated power supply boasts a 540 VA EI-type transformer and an array of four new-generation type 10,000 µF filter capacitors. The Class AB output stage is conservatively rated at 100W+100W at 8 ohms and 150W+150W at 4 ohms.
Luxman Electronically Controlled Ultimate Attenuator
Unassuming and often overlooked, the volume control can be the source of subtle and not-so-subtle sonic degradations. Conventional, variable-resistor volume controls often introduce noise. And left/right tracking errors can unintentionally shift the stereo balance as the user adjusts volume. For these reasons, Luxman has long avoided the variable resistor in favor of carefully crafted attenuator circuits, improved over generations. The LECUA system is built around a custom solid-state IC precision attenuator. It delivers meticulous volume adjustment across 88 discrete steps while minimizing distortion. The traditional rotary volume knob interface achieves a satisfying, weighty tactile response.
LECUA technology is also applied to the balance control.
Luxman paid meticulous attention to vinyl playback with an advanced phono equalization circuit featuring a parallel first stage. The circuitry accommodates both moving magnet and moving coil cartridges via a front-panel selector. To maintain the integrity of delicate musical signals while enhancing the energy of the output, Luxman engineers have long considered the preamplifier stage as a “power amp driver.” For this reason, the last stage of the preamplifier is fitted with discrete buffer circuitry and a high-current supply.
Other Enhancements
The new amplifier also features a precise 7-segment LED display, making it easy to see volume level from any listening position. Instantaneous output is displayed on large, highly sensitive VU meters that are now illuminated by white LEDs for optimum viewing. To help listeners concentrate on the music, both the LED display and VU meter lighting can be deactivated by the supplied remote control. The 4.4 mm, five-conductor, balanced headphone jack provides independent left/right grounding for improved stereo separation. It supplements the standard 6.3 mm jack. Rear-panel 12-volt trigger input and output accommodate compatible home automation systems. Control input and output terminals coordinate operation with compatible Luxman components. Preamp output and power amp input enable flexible system configurations, including bi-amping and powered subwoofer connection.
To protect the purity of music reproduction, Luxman engineers gave careful thought to signal routing and input/output terminals. Beeline topology minimizes internal signal runs. Oxygen-free copper (OFC) wiring helps ensure uncommon musicality. The internal cables further protect the signal with spiral wrap shielding for each non-plated core wire. Because slight variations in ground impedance can have a subtle smearing effect on the music, Luxman engineers adopted a loop-less chassis structure.
Even the printed circuit boards reflect Luxman’s thoroughgoing approach: round-cornered asymmetric printed circuit traces ensure smooth current transmission while resisting interferences. Luxman also provides 18mm spacing between input terminals to accommodate high-grade interconnects. The inline speaker terminals offer ample spacing for large-gage speaker cables and Y terminators.
The supplied RMA-17A wireless remote control also operates Luxman digital players released after 1996.
The L-505Z integrated amplifier is available now at a suggested retail price of $5995.
For more information, visit luxmanamerica.com.
