Luxman L 580 (1994)
At 30kg, it takes over the rack. It is a 50-watt Class A amplifier with a brushed front panel.
Overview
The Luxman L 580 was released in October 1994. It came from a company that had already committed to pure Class A amplification, and it is heavy. It weighs 30kg and measures 438 x 176 x 467 mm. The chassis is built to resist resonance rather than react to it. It cost ¥380,000 at launch, so it was not aimed at the casual listener. It puts out 50 watts per channel into 8 ohms in Class A. That means no crossover distortion, because the output devices conduct continuously.
The L 580 delivers those 50 watts in strict Class A. That takes massive thermal management and a power supply rated at 270W. Frequency response is very wide for a pre-main amplifier of its era - 10 Hz to 100 kHz within 1 dB on line inputs. Total harmonic distortion is rated at 0.01% or less, and cross modulation distortion matches that figure.
Inputs are comprehensive for a machine that strips away speaker switching and headphone outputs: MM and MC phono stages with sensitivities of 2.5mV and 0.1mV respectively, nine line-level inputs (including balanced XLR on Line 1–3), plus dedicated DAT and tape loops. The signal-to-noise ratio is telling—108 dB or more on line inputs, but 86 dB on MM and 74 dB on MC, which aligns with the inherent noise floor of moving magnet and moving coil cartridges. There’s no attempt to mask the reality of analog front-end limitations; instead, the design works within them, offering a phono stage that’s competent but not miraculous. The tone controls allow ±4.5 dB of adjustment, a modest range that suggests they’re meant for room or recording correction, not tonal reinvention.
Specifications
| Manufacturer | Luxman |
| Product type | Solid State Stereo Integrated Amplifier (Pre-main amplifier) |
| Production years | Released in October 1994 |
| Original price | ¥ 380,000 |
| Continuous output power | 50W + 50W (8 Ω, Class A Operation) |
| Total harmonic distortion | 0.01% or Less (8 Ω, Rated Output, Direct On) |
| Cross modulation distortion | 0.01% or Less (8 Ω, 60 Hz : 7 kHz = 4 : 1, Rated Output, Direct On) |
| Input Sensitivity / Impedance | Phono MM : 2.5mV/50k Ω; Phono MC : 0.1mV/100 Ω; CD, Tuner, Line1, 2, 3 (XLR), DAT/Tape1, 2, 3 : 150mV/47k Ω; Signal Processor : 150mV/47k Ω |
| SN ratio (IHF-A correction, direct on) | Phono MM : 86 dB or more (5 mV input); Phono MC : 74 dB or more (250 μ V input); CD, Tuner, Line1, 2 : 108 dB or more (input short) |
| Frequency response (direct on) | Phono MM : 20 Hz to 20 kHz ± 0.3 dB; Phono MC : 20 Hz to 20 kHz ± 0.3 dB; CD, Tuner, Line1, 2 : 10 Hz to 100 kHz - within 1 dB |
| Tone Control Maximum Change | ± 4.5 dB |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| Power consumption | 270W (Electrical Appliance and Material Control Law) |
| External dimensions | Width 438 x Height 176 x Depth 467 mm |
| Weight | 30kg |
Key Features
Pure Class A Pre-Main Amplifier with Custom Parts
The L 580 is a pure Class A pre-main amplifier. The output devices conduct at all times, which eliminates crossover distortion - the momentary gap when one transistor hands off to another in Class AB designs. The cost is heat, and lots of it. Luxman used the thermal mass and chassis design as part of the solution. Original custom parts run throughout the signal path, in place of off-the-shelf components that might introduce variability or coloration.
Large-Capacity Power Transformer for Dynamic Headroom
The power supply is built around a large-capacity transformer. It sustains continuous output and also delivers instantaneous current during dynamic transients. The 270W power draw reflects a supply designed to stay ahead of demand, which minimizes sag and keeps voltage stable under load. Complex orchestral passages and bass-heavy acoustic recordings are where current demands spike.
Ultimate Attenuator Volume Control
Luxman’s “Ultimate attenuator” is a 32-contact rotary switch built on a glass-epoxy gold-plated substrate, with non-magnetic resistors hand-mounted for precision. It sits in an aluminum die-cast and extruded shield case, designed to prevent magnetic interference and microphonic effects. Potentiometers can wear, crackle, or introduce phase shifts. This stepped attenuator gives discrete, repeatable gain settings with minimal signal degradation. The knob clicks deliberately at each step.
Minimized Signal Path with Input Selector + Power Amplifier Concept
The circuit follows an “input selector + power amplifier” approach, which strips the signal path to its essentials. Luxman left out the headphone output and speaker A/B switching, which removes potential sources of crosstalk, ground loops, and parasitic capacitance. The signal runs from input to speaker terminal with as few junctions and switches as possible. Some describe the result as “unamplified,” with the amp disappearing from the chain.
Gold Contact Relays for 10-System Input Switching
Input selection uses gold contact relays, one per input, switching both the hot and ground sides of the signal. With this full differential switching, a deselected input is completely isolated, with no floating grounds and no capacitive coupling to inactive circuits. With 10 input systems supported, the L 580 handles a full set of analog and digital sources, though DACs would be external. The relays sit close to the input terminals. That shortens unterminated traces and reduces the chance of RF ingress or signal degradation before selection.
Elimination of Speaker A/B and Headphone Outputs
The missing speaker switching and headphone jack are deliberate. Each added feature brings switches, buffers, or extra circuitry that can degrade the main path. With them gone, the amplifier only drives speakers. That makes the L 580 unsuitable for multi-room setups or late-night listening, but it suits a fixed, high-fidelity system.
High-Performance Internal Components
Inside, the L 580 employs parts chosen for sonic neutrality: gold-plated, non-magnetic resistors to avoid magnetic hysteresis, copper foil styrene capacitors known for low dielectric absorption, pure focus-type electrolytic capacitors for stable energy storage, and high-purity copper cabling for internal connections. These aren’t just premium labels—they’re components selected to minimize phase shift, distortion, and energy storage effects that can blur transients. The cumulative effect is a transparency that reveals both the quality and flaws of source material.
High-Rigidity Ceramic FRP Chassis with Five-Point Insulators
The bottom chassis is made from a high-rigidity, large-mass ceramic special FRP (fiber-reinforced plastic), chosen for its damping properties and resistance to microphony. It sits on five-point insulators, which decouple the assembly from the surface below and reduce transmission of external vibrations. The mass also acts as a thermal and mechanical stabilizer, which helps long-term stability.
Historical Context
The L 580 is a direct descendant of the L-550, introduced in 1981 as the world’s first pure Class A integrated amplifier. The line went through the L-550X, L-550Z, and L-570, each refining the Class A topology and thermal management. The L-570 notably added heat-pipe cooling. The L-580 continues the series’ reputation as representing “the state-of-the-art in Class A amplification.”
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