Luxman L-550AX II, stereo stiprintuvas

Gamintojas: Luxman
Prekės kodas: N10779
Įsigijimo galimybė: Klausti
Mato vnt.: vnt.

Luxman L-550AX II, stereo stiprintuvas

Aukščiausios klasės, klasikinis Pure Class A Push-Pull stereo stiprintuvas, kuriame realizuoti geriausi Luxman (nuo 1925m.) Old-School ir New-School inžinieriniai sprendimai.
Luxman L-550AX II yra atnaujinta L-550AX stiprintuvo versija. L-550 AX II gavo dar tikslesnį LECUA1000 garso reguliatorių ir naują neigiamo grįžtamo ryšio schemos versiją - ODNF 4.0.
2X40WRMS/4om arba 2x20WRMS/8om. MM/MC Phono, 4x Stereo RCA linijiniai, 1x Stereo XLR balansinis ir Main-In įėjimai; Rec-Out, Monitor Out, Pre-Out ir aukštos klasės ausinių stiprintuvo 6.3 mm Jack lizdas.
Dual Mono topologija, maksimaliai trumpas signalo kelias, OFC vidiniai kabeliai, relinė įėjimų komutacija (Takamisawa relės), procesoriaus valdomas originalus LECUA1000 pasyvinis varžinis garso reguliatorius su rankiniu būdu atrinktom varžom, patentuota Luxman ODNF 4.0 neigiamo grįžtamo ryšio schema; Shottky diodai ir 4x 10000mkF kondensatoriai maitinimo grandinėje, sudvigubinti Toshiba 2SC5200 bipoliariniai galios tranzistoriai, sudvigubintos išėjimo relės, galingas 470VA EI tipo transformatorius.
Loudness, Bass, Treble, Subsonic filtras, Line stright ir Mono režimai, A/B System (A+B output).
Rodykliniai stereo kanalų signalo lygio indikatoriai, 8mm aliuminio priekinė panelė, distancinio valdymo pultelis aliuminio korpuse.
Svoris 24.3kg. Spalva: sidabrinė.
Made In Japan.

L-550AX II, Pure Class A Integrated Amplifier

Pure Class-A pre-main amplifier L-550AXII is refine the L-550AX played a full model change in 2011 from basic performance to review Mark II model. Own and amplifying the feedback circuit ODNF4.0, new LECUA1000, such as buffer circuit of discrete composition, the introduction of the latest technology that is comparable to high-end models L-590AXII, shiny and density feeling of pure Class-A amplification method unique while winning the sound, it has achieved the resolving power and expressiveness beyond the class. L-550AXII enhances the appeal and degree of completion as an integral amplifier, is Luxman confidence of middle-range models to spend a dense time with the music to your hearts content. The first in the new series, the L-590AX II is a fully balanced design. The L-550AX II has all the performance of high-end audio in one elegant & convenient package.
Luxman introduced the L-550A and L-590A in 2005, since then we have celebrated our 80th anniversary with commemorative components that have reaffirmed Luxman's status at the pinnacle of high-end audio. In these latest integrated models, the gorgeous texture and three-dimensional performance of our original Class A amplifiers has been retained and further refined. For example, the L-550A II amplifiers featured a new electronic selector switch, adopted from the input section of the C-1000f control amplifier; while the 'x' series now uses a variation of the LECUA discrete volume control first introduced in the C-1000f.

Chassis bases have superb vibration absorption in order to surpress noise levels. The power transformer, electrolytic capacitors and amplifier output stage (see amp block below) 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.

Pure Class A

Thanks to the always-on nature of the topology and the removal of an entire type of distortion, allied to sound that excels in a midrange liquidity, low-level detail, superb dynamics and transparency, its devotees are more than happy to put up with low efficiency and heat. What Class A always seems to offer above everything else is a tube-like sound without the maintenance hassle of tubes.


Input Selector

The L-590AX II, L-550AX II and the L-509u, 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 L-550A / L-590A. In addition the illuminated position indicator around the input selector knob, makes it much easier to view the selected position even from afar.

Volume Control

The integrated amplifiers also benefit from the C1000f in that they use a variation of the LECUA1000 volume control. At any single volume setting only a few resistors are in circuit per channel. The less devices in the signal path, the purer the sound, the cleaner the music.
At low listening levels, potentiometers have trouble keeping both channels in balance,  so one channel might easily be 3dB louder than the other. With the volume control made of discrete parts, this is no longer an issue.
New LECUA1000 revamped the buffer circuit of the input stage to the conventional type, achieving a low volume adjustment of sound quality deterioration in the smooth of 88 step. In addition, adopting the 3D layout of the three-dimensional arrangement of the substrate in the new LECUA1000. Connect the attenuator circuit and the amplifier circuit to direct, as well as success in the shortest and high efficiency of the route, to suppress the change in sound quality due to the influence and volume position of the foreign vibration, was an excellent structure to change with the passage of time and durability.


The amplifier section has not been ignored either; noise and distortion has been kept to a minimum with the introduction of ODNF version 3.0A. The deep, rich Class A tone is available here is Luxman’s hall-mark sound. More info on ODNF below.


Luxman holds many patents for audio engineering, amongst them is the application of Global Negative Feedback to the output stage, which while widely used throughout the audio industry, they no longer use themselves.

Luxman nowadays use 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. Conventional negative feedback systems can have an adverse effect on the music, introducing phase distortion. "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 is alleviated, again improving sound quality.
In L-550AXII, inheriting the performance of the power amplifier M-700u and upper model L-590AXII, greatly improved latest ODNF Ver4.0 with the three-stage Darlington parallel push-pull configuration of the distortion characteristic and the S / N ratio of the high-frequency mounting a large-scale power amplifier circuit. Output of pure Class-A method of operation at the rated 20W + 20W (8Ω), in addition to the fine musical expression with a density sense of penetration force, has achieved a high drivability by more than enough power design.

Pure Copper Cabling 

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.

Phono Amplifier  

Enjoy the ability to play or record your LP collection with the 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 (a multiplication of 550x). We recommend MC cartridges with an output >.25mV.

Subsonic Filter

A subsonic filter is also easily accessible from the remote control in order to remove unwanted low frequency noise while you are listening to a record. When the stylus hits the groove, you might notice the woofers modulating in and out, even 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. Both the Mono & Subsonic filter are accessible from the remote control.

Headphone Amplifier

There is also a high quality headphone amplifier, accessible from the front panel, ideal for late night listening. You can turn off the speaker output by a simple click of the Speaker Selector.

The headphone outlet sees the same signal as the speaker terminals, there is one resistor per channel in the signal path to pad down the output.

Two Pairs of Speaker Terminals 

Large speaker terminals for driving two individual sets of speakers. At the turn of the speaker switch, it is possible to change between the two pairs of speakers easily. In addition, if the A+B function is used; Takasina capacitors are used to parallel the output which permits bi-wiring a single pair of speakers.

Tone Controls 

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 sonicly 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. When you want to bypass the tone controls, just engage the Line Straight switch, either from the remote control or from the front panel.
RA-17 remote control not only handles Mono, Line Straight (tone controls defeat), Separate (Home Theater Processor Bypass), Subsonic (rumble filter for vinyl playback) and even Loudness (mild boost of bass & treble for low level listening).