Luxman L-507s (1996)

At 20 kg, it lands on the rack like a declaration—this is serious engineering, not just another integrated amp.

Overview

The Luxman L-507s isn’t a subtle statement. Announced in 1996 as the flagship of Luxman’s 500 series, it carries the weight—both literal and philosophical—of a company reasserting its identity. Built during Luxman’s post-Alpine era and manufactured under AZDEN, this pre-main amplifier was engineered to reflect the brand’s renewed focus on high-end integration without compromise. At 20 kg and with a chassis forged from a five-point FRP (Fiber Reinforced Plastics) composite base, it’s built to resist resonance and deliver stability. The front panel, a massive extruded aluminum piece crafted in-house using high-precision CNC machinery, reinforces the impression of exacting standards. This is not mass-market gear; it’s a precision instrument.

Owners report that the L-507s splits the difference between separates and integration, borrowing circuitry and components directly from the elite L-509s. The OD ßeta (Optimized Dual ßeta) and simplified SSC (Single Stagger Circuit) topologies are central to its design, aiming for minimal signal degradation and high linearity. A large EI core power transformer feeds a mechanically decoupled, low-impedance power supply—critical for dynamic control. The use of newly developed ultra-low noise custom resistors, shared with the L-509s, C-10II, and B-10II, suggests Luxman wasn’t cutting corners on internal parts selection. Two large backlit logarithmic meters dominate the fascia, offering real-time power monitoring, while motor-driven input and volume controls promise smooth, reliable operation without sacrificing signal integrity.

Despite its integrated form, the L-507s doesn’t skimp on flexibility. It includes a built-in MM/MC phono stage—a rarity in high-end integrated amplifiers of the era—making it a true one-box solution for analog enthusiasts. Balanced XLR inputs and a pre-out/main-in loop allow it to function in more complex systems, blurring the line between integrated and separates. The inclusion of a wireless remote control was a notable luxury at the time, enabling full control over input selection, volume, muting, and meter lighting. Whether that convenience outweighs potential long-term reliability concerns around obsolete RF modules remains undocumented, but the feature underscores Luxman’s intent to deliver a complete, modern experience.

Specifications

Key Features

OD ßeta and Simplified SSC Circuitry

At the heart of the L-507s lies Luxman’s OD ßeta (Optimized Dual ßeta) and simplified SSC (Single Stagger Circuit) designs. These topologies were not marketing terms but deliberate engineering choices aimed at reducing distortion and phase shift across the audio band. The OD ßeta configuration optimizes transistor biasing for linearity, while the SSC reduces the number of gain stages, minimizing cumulative noise and signal degradation. According to available documentation, this approach contributed to the amplifier’s exceptionally low THD—reportedly under 0.005% at 1 kHz—and stable performance across the full 20 Hz to 20 kHz range. The result was a signal path designed for transparency, not coloration.

MM/MC Phono Stage with High Sensitivity

Unlike many high-end integrated amplifiers of the 1990s that omitted phono stages entirely, the L-507s includes a fully featured MM/MC input. With an MC sensitivity of just 0.3 mV and an impedance of 100 Ohm, it’s built to handle low-output moving coil cartridges without requiring an external preamp. The MM input, at 2.5 mV sensitivity and 47 kOhm impedance, adheres to standard expectations. Signal-to-noise ratios of 91 dB (MM) and 75 dB (MC) suggest respectable performance, though MC users in high-gain setups may still need to consider external step-up transformers for the quietest backgrounds. Still, the inclusion of a dual-stage phono input in a 100W integrated was a significant differentiator.

Motor-Driven Input and Volume Controls

Luxman opted for motor-driven input selection and volume control, a feature intended to eliminate mechanical wear and contact noise over time. Sources suggest this design improves long-term reliability and ensures smooth, repeatable operation. The motorized system is fully integrated with the wireless remote, allowing seamless control from a distance. While some purists argue that any motorized component introduces potential failure points, the implementation here was part of a broader strategy to maintain signal purity—by isolating user interaction from the signal path itself.

Line Phase Sensor and AC Polarity Management

Equipped with a Line Phase Sensor, the L-507s allows users to manage the polarity of the AC power supply. This feature, uncommon in consumer gear, enables optimization of the amplifier’s internal grounding relative to the wall outlet, potentially reducing hum and improving noise floor. While the audible impact of such a feature is debated, its presence signals Luxman’s attention to detail in power delivery and system synergy. Combined with the mechanically decoupled power supply and large EI core transformer, it reflects a holistic approach to noise reduction.

Wireless Remote Control

The inclusion of a wireless remote was a premium touch in 1996. According to documentation, it controls power on/off, input selection, volume, muting, and meter lighting. This level of convenience was rare in high-fidelity amplifiers at the time, where IR remotes were often limited to basic functions or omitted entirely. The remote’s functionality suggests Luxman was targeting users who valued both performance and usability—perhaps bridging the gap between audiophile and high-end home audio consumer.

Five-Point FRP Composite Base

The chassis construction uses a five-point FRP (Fiber Reinforced Plastics) composite base, designed to dampen vibrations and prevent resonance from affecting sensitive circuitry. This approach, shared with other Luxman components from the late 1980s through the 1990s, reflects a consistent philosophy of mechanical isolation. The rigid FRP platform supports the internal layout while decoupling the amplifier from shelf-borne vibrations. Paired with the massive extruded front panel, the build quality communicates a sense of permanence and precision.

Historical Context

The L-507s was introduced in 1996 as the top-tier model in Luxman’s 500 series, representing a pivotal moment in the brand’s resurgence after its association with Alpine. Manufactured under AZDEN, it carried forward design principles from earlier flagship models while incorporating newer technologies like the wireless remote and refined circuit topologies. It shared core circuitry with the L-505s, though the L-505s reportedly featured a less capable phono stage and lower power output. In 1999, the model was updated to the L-507sII, reportedly to accommodate SACD bandwidth requirements, indicating Luxman’s forward-looking approach to high-resolution audio.

Collectibility & Value

Original pricing for the L-507s was 262,000 ¥ in Japan. Current market listings show the L-507sII selling for around $2,500 in very good condition, though no verified data on failure rates, maintenance needs, or spare parts availability is available. With only three user reviews contributing to an average rating of 4.3 out of 5, documented user experience remains sparse. Notably, one user observed that the L-507s had never appeared in any major Hi-Fi magazine review, suggesting it may have flown under the radar despite its technical ambitions. Availability through authorized dealers outside Japan, such as in the San Francisco Bay Area, was reportedly limited, which may affect parts and service access today.

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