Luxman states that it has completed its Z Series line of integrated amplifiers with the introduction of the L-505Z.
The company points out the new model represents the latest development in a series of 505 models going back to the L-505f of 2001, while introducing significant upgrades including the Luxman Integrated Feedback Engine System (LIFES1.0) and the Luxman Electronically Controlled Ultimate Attenuator (LECUA).
“The Z Series is now complete, in anticipation the company’s 100th anniversary in 2025,” comments Jeff Sigmund, president of Luxman America. “The global community of reviewers, resale partners, and music lovers has welcomed our Z Series. We’re looking forward to introduce the L-505Z’s level of performance to a wide range of listeners.”
The L-505Z is intended to replace the L-505uXII and Luxman notes the introduction of the new integrated amplifier completes the Z Series of products 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, parallel headphone output jacks including a “Pentaconn” balanced type and 7-segment LED volume level-VU meter display.
The LIFES1.0 power amp stage is the latest version of Luxman’s multi-decade quest to combine the benefits of negative-feedback-free amplifiers with the ultra-low distortion that feedback enables. Previously, the company explains, 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.
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LIFES1.0 supersedes, these previous designs the company boasts with a completely redesigned circuit featuring improvements in distortion detection, regulation, and thermal stability.
Luxman emphasizes the L-505Z combines high power and linearity, thanks to bipolar transistors in triple paralleled Darlington push-pull configuration. The highly regulated power supply features a large 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 100 watts x 100 watts at 8 ohms and 150 watts x 150 watts at 4 ohms.
Other Luxman design concepts the new integrated amplifier employs include the LECUA volume control system. The company says that conventional, variable-resistor volume controls often introduces noise. Left/right tracking errors can unintentionally shift the stereo balance as the user adjusts volume. For these reasons, Luxman asserts that it has long avoided the variable resistor in favor of carefully crafted attenuator circuits. The LECUA system is built around a custom solid-state IC precision attenuator. It delivers fine volume adjustment across 88 discrete steps while minimizing distortion.
Moreover, some of the other aspects of the L-505Z integrated amp Luxman focused on were the component’s phono equalization system that utilizes a parallel first stage. The integrated amplifier accommodates both moving magnet (MM) and moving coil (MC) 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 high-current supply.
Additionally, the new amplifier also features a 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 which 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 L-505Z also offers a 4.4 mm, five-conductor, balanced headphone jack that 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.
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