Luxman L-505s (1990s)
A stereo integrated amplifier released in the 1990s, with dual VU meters and advanced circuit engineering for high-fidelity audio reproduction.
Overview
The Luxman L-505s is a stereo integrated amplifier made by Luxman and released in Japan during the 1990s. It belongs to a series that includes the D-600s and D-700s CD players, so it was designed as part of a coordinated product family. It has two large VU meters, a Line Phase Sensor, and a System Bus for expanded connectivity. It supports both MM and MC phono inputs and comes with a wireless remote control for system operation.
Design
The amplifier uses circuit technology and components derived from the L-509s, including custom ultra-low noise resistors based on acoustically refined carbon film. It runs Luxman's proprietary OD β and ODNF circuits, along with the Complementary Single Stagger Circuit (CSSC), for ultra-wide bandwidth and high slew rate with minimal distortion. The power amplifier section uses high-capacity Pc150W class transistors, dual differential transistors, and high-voltage transistors. A large EI core power transformer supplies power. A separate transformer isolates the microcomputer-controlled remote circuit from the audio path. Inside, the heat sinks, block capacitors, and transformers sit in symmetrical positions, and a shielded BOX structure separates the power, supply, input/output, and display units. The speaker terminals are custom-designed to accept banana plugs and Y lugs. The front panel has a pear-shaped finish with precision hairline treatment and an 8 mm thick acrylic meter cover.
Specifications
| Continuous effective output (8 Ω) | 100W + 100W |
| Power output (4 Ω) | 2x 150W |
| Total harmonic distortion factor (8 Ω, 1 kHz, Rated Output) | 0.005% or Less |
| Total harmonic distortion factor (8 Ω, 20 Hz to 20 kHz, Rated Output) | 0.03% or less |
| THD (General) | <0.007% |
| Damping factor | 240 |
| Input Sensitivity / Impedance CD | 130mV/47k Ω |
| Input Sensitivity / Impedance Phono MM | 2.5mV/47k Ω |
| Input Sensitivity / Impedance Phono MC | 0.3mV/100 Ω |
| Input Sensitivity / Impedance Line | 180mV/42k Ω |
| Input Sensitivity / Impedance Tape | 130mV/47k Ω |
| Input Sensitivity / Impedance Recorder | 180mV/42k Ω |
| Input Sensitivity / Impedance Bal. Line/CD | 130mV/66k Ω |
| Input Sensitivity / Impedance Bal. LINE | 180mV/79k Ω |
| Input Sensitivity / Impedance Main-in | 1V/51k Ω |
| Output voltage Tape | 130mV |
| Output voltage Recorder | 180mV |
| Output voltage Pre-out | 1V |
| S/N ratio (IHF-A) CD | 103 dB or more (input short-circuit) |
| S/N ratio (IHF-A) Phono MM | 91 dB or more (5 mV input) |
| S/N ratio (IHF-A) Phono MC | 75 dB or more (0.5 mV input) |
| S/N ratio (IHF-A) Line | 105 dB or more (input short circuit) |
| S/N ratio (Line, general) | 110dB |
| Frequency response (Line Straight on) CD | 20 Hz to 100 kHz -3dB |
| Frequency response (Line Straight on) Phono MM/MC | 20 Hz to 20 kHz ± 0.5 dB |
| Frequency response (Line Straight on) Line | 20 Hz to 100 kHz -3dB |
| Frequency response (General 1) | 20Hz-20kHz (+0, -0.1dB) |
| Frequency response (General 2) | 5Hz-100kHz (+0, -3.0dB) |
| Tone control Maximum variation | + / - 10 dB |
| Tone control Bass | ± 10 dB (100 Hz) |
| Tone control Treble | ± 10 dB (10 kHz) |
| Loudness control 100 Hz | + 7 dB (+ / - 1 dB) |
| Loudness control 10 kHz | + 5 dB (+ / - 1 dB) |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| Power consumption | 220W (Electrical Appliances and Materials Safety Act) |
| External dimensions | Width 467 x Height 179 x Depth 418 mm |
| Weight | 21.0kg |
Inputs/Outputs
The Luxman L-505s has Phono (MM/MC), CD, Tuner, Line 1, Line 2, and Main In inputs, with Rec Out, Pre Out, and Headphone outputs. It has both RCA and XLR balanced input terminals, plus a dedicated speaker terminal that takes banana plugs and Y lugs. Two unswitched AC outlets are rated up to 300W total.
Attachments/Features
Standard features include a power meter, phono jack, recording selector, speaker selector, mode selector, tone and balance controls, Straight Line mode, Subsonic filter, Loudness compensation, Phase inverter, Line Phase Sensor, wireless remote control, and headphone jack. It is built to fit into multi-channel systems, with an optimal volume setting of -14dB for home theater use.
Product Family
The L-505s is part of Luxman's f-Series and is a pre-main amplifier, so the preamp and power amp sections can be used independently. It can be upgraded to a separate system by pairing it with other control or power amplifiers, and it supports bi-amping or multi-amping configurations.
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