Luxman Audio L-505uX Integrated Amplifier

MSRP: $4,100

Like a Bentley automobile, this is about quiet, quality, relaxed refinement – something you can slip into and enjoy right away and live with for a long, long time. But unlike a Bentley, it does not come with a exorbitant price. Considering its feature set, fastidious build quality, cache, elegant sound presentation and the fact that for many companies, this would be their top model- not their entry level – this is really kind of a bargain. – Stereo Mojo

Product Description

Luxman Audio L-505uX Specifications

Continuous effective output 100W + 100W/8Ω
140W + 140W/4Ω
Input 4 line systems
Phono 1 system (MM/MC switchable)
1 balanced line system
Sound recording input/output 2 line systems
Pre- output and main input 1 system, each
Speaker output A, B 2 systems
Amplifier version ODNF 2.2
Output constitution Bipolar parallel PP
Power transformer EI type 440VA
Damping factor 110
Harmonic Distortion
0.005% or less ( 8Ω at 1KHz)
0.03% or less (8Ω and 20Hz~20KHz)


Input sensitivity/impedance
PHONO (MM) : 2.5mV/47KΩ
PHONO (MC) : 0.3mV/100Ω
LINE : 180mV/42KΩ
BAL. LINE : 180mV/79KΩ


Output voltage TAPE: 180mV and PRE-OUT: 1V
Signal-to-Noise Ratio(IHF-A)
PHONO (MM) : Above 91dB
PHONO (MC) : Above 75dB
LINE : Above 105dB


Frequency characteristic
PHONO : 20Hz~20,000Hz (±0.5dB)
LINE : 20Hz~100KHz (+0dB ~ -3dB)


Front panel
: Volume and input selector, meter, power switch, monitor switch, [phono] MC switch, REC out switch,  speaker selector, stereo / mono mode selector, bass (±10dB @ 100Hz) & treble (±10dB @ 10kHz) tone controls, subsonic filter (9 Hz) and balance control, line straight switch (tone controls bypass), separate switch (splits the internal preamp from the amplifier) meter light and headphone jack, power on indicator and protection indicator


Rear panel
Balanced phase inverter, signal ground and line phase sensor, AC inlet.Remote Control



Electric power consumption 1.2W (stand-by),  82W (idle),   210W  (rated output)
Dimensions W x H x D 18.3” (467mm) 7” (179) 17.25” (437)
Weight 46.2 lbs.    (21kg)




Analog Audio's Review Of The Luxman L-505X Integrated Amplifier

The Luxman L-505X has been in continuous production for over thirty years and has quite often been Luxman‘s best selling single product. Of course it has been updated & refined many times over the past thirty years. The Luxman L-505f was introduced in 2001 and was remarkably successful as many proud Luxman owners will happily testify. Its successor, the L-505X, now has Luxman’s unique noise & distortion canceling technology – ODNF version 2.2 as well as the electronic input selector (trickle-down technology from the flagship C-1000f) , which has lowered channel crosstalk & increased channel separation.

The L-505X is a fully featured integrated amplifier, with a wonderful phono stage, multiple inputs (including one balanced), tone controls (easily defeated at the touch of a button), enough power to drive most speakers in just about any room in your home and a remote control to add convenience to a remarkably comprehensive integrated amplifier.  It is a wonderful entrance to the world of Luxman.

The Luxman L-505X Integrated Amplifier has received numerous awards, Including:

STEREOPHILE (USA) –  Editor’s Choice Award (2009)
–  Recommended Components; Class A (2009)
STEREOMOJO (USA) – Maximum Mojo
MJ TECHNOLOGY (Japan) – Technology Of The Year
AUDIO ACCESSORY (Japan) – Audio Excellence Award
STEREO (Japan) – Special Commendation (October 2007)



Chassis bases have superb vibration absorption in order to suppress noise levels. The power transformer, electrolytic capacitors and amplifier output stage are laid out so as not to interfere with each other. To reduce interference further, the block construction isolates each section using shielding panels, and extensive internal filtering to reject magnetic flux interference.

Luxman’s patented ODNF circuitry has redefined the relationship between music signals and noise. ODNF does not use phase compensation or NFB loops in the music signal path, instead it accurately isolates distortion components to cancel them. Luxman holds many patents for audio engineering, amongst them is the application of  Global Negative Feedback to the output stage (1955) which, while widely used throughout the audio industry, is no longer used by Luxman. Conventional negative feedback systems can have an adverse effect on the music, introducing phase distortion. Instead, Luxman utilizes a distortion reduction circuit called “Only Distortion Negative Feedback” (ODNF). This system works by isolating noise & distortion at the output from the music signal and sparingly applying negative feedback to suppress them.  The circuit features such an ultra-wide range, ultra- high slew rate and ultra low distortion that it does not use phase compensation for the music signal amplifying circuits.” This new technology also ensures that need for a DC servo circuit circuit is alleviated, again improving sound quality.

Both the L-505u and L-509X, feature the new high quality electronic selector switch, which is the heart of the C-1000f pre-amp (one of Luxman’s 80th anniversary commemoration models). The sound quality deterioration using the new electronic input switch is now minimal, while channel separation and crosstalk efficiency were raised substantially in comparison with the previous L-505f / L-509f SE. In addition the illuminated position indicator around the input selector knob, makes it much easier to view the selected position even from afar.

Extensive listening was applied to the high purity, oxygen free copper (OFC) cables which are used to transmit the signal throughout the amplifier. These cables have a minimal audible signature and minimal electrical effect on the audio waveform. Linear wide bandwidth frequency response is achieved by the low measured values of both inductance and capacitance. The result, the cables do not color the sound, but pass it through, quickly.

Enjoy the ability to play or record your LP collection with the Luxman L-505X’s built-in phono stage which accommodates both Moving Magnet and Moving Coil cartridges. The MM input has approx. 35dB of gain. While the MC input has 55dB of gain (thats a multiplication of 550x). We recommend MC cartridges with an output  >.7mV. In the event of the use of a moving coil cartridge which outputs less than .7mV, Luxman offers a step up transformer.

A subsonic filter is also easily accessible on the front panel in order to remove unwanted low frequency noise while you are listening to a record. When the tylus hits the groove, you migt notice the woofers modulating in and out, evn though there is no music playing yet. This is due to the ultra low frequency information (below the music), this unnecessary information places a strain on the amplifier and is best filtered out. A mono switch is also available for both loudspeaker setup as well as mono record playback.

The Luxman L-505X  also includes a high quality headphone amplifier, accessible from the front panel. You can turn off the speaker output by a simple click of the Speaker Selector.

There are two large-sized power meters on the Luxman L-505u, calibrated in decibels are easy to read even from a distance. The logarithmic compression system is easy to grasp and also how this applies to the music. The meters are calibrated from -60dB below full rated power to +3dB above rated power. An 8mm thick acrylic covers the meters, which are normally backlit, though the illumination may be turned off from the remote control.

The tone controls might seem like an anachronism in this day and age of minimalism, but they can be remarkably effective in bring to life a less than perfect music collection. We all have music gems in our collection that are sonically challenging. A lot of the 1980′s CDs are quite harsh sounding and the digital glare can be quite fatiguing. Reduce the treble slightly and while the harsh CD is not going to suddenly sound like a reference recording, at least it will now be perfectly listenable. Sit back relax, enjoy the music & forgot about the HiFi. With the Luxman L-505X, when you want to bypass the tone controls, just engage the Line Straight switch.