A pure class A design transformed into a MKII model Capable of optimising sound density
Pursuing a sound that appeals to the senses whilst creating a deep musical impression is the ultimate role of the audio amplifier. With pure class A design, the L-550AXII integrated amplifier is a refined version of the L-550AX which was itself fully restyled in 2011. The MK II model boasts improved functionality with the latest technologies equivalent to the higher grade L-590AXII such as Version 4.0 of the original amplification feedback circuit ODNF, the new LECUA1000, computerized attenuator, and a buffer circuit with discrete configuration as standard. Such features result in a model with capability of expression above its class, offering a mellow and dense sound that only pure class A amplification can create. The L-550AXII is a mid-range integrated amplifier that increases its maturity in an attractive, functional design for music to be thoroughly enjoyed.
Large-capacity power supply circuit
A high-inertia power supply circuit that combines a large capacity EI core type power transformer (to which a vibration control feature has been newly added) and a large capacitor block (10,000uF x4) is an integral part of the L-550AXII. This large capacity power supply circuit supports the sound dynamics of the unit by enhancing stability at the core of the design.
Discrete buffer circuit
A discrete buffer circuit that is the equivalent to those used in the top end LUXMAN C-900u separate amplifier is mounted on the output stage of the pre-amplifier circuit. This protects the purity of the audio signals whilst simultaneously enhancing the drive force for the power amplifier.
Proprietary technologies
The L-550AXII is designed using proprietary technology and customised parts to optimise the sound quality of this integrated amplifier. For example, the round pattern board enabling smooth signal transmission, and a Beeline construction configuring the optimal parts locations and the shortest signal routes. In addition to this, the loopless chassis structure minimizes the ground impedance increase.
| Rated output |
20W + 20W (8Ω), 40W + 40W (4Ω) |
| Input sensitivity / input impedance |
PHONO (MM): 2.5mV/47kΩ
PHONO (MC): 0.3mV/100Ω
LINE: 180mV/47kΩ
BAL.LINE: 180mV/55kΩ
MAIN-IN: 450mV/47kΩ |
| Output voltage |
RECOUT: 180mV, PRE OUT: 1V |
| Frequency response |
PHONO: 20Hz to 20kHz (±0.5dB)
LINE: 20Hz to 100kHz (+0, -3.0dB) |
| Total harmonic distortion |
0.007% or less (8Ω, 1kHz)
0.02% or less (8Ω, 20Hz to 20kHz) |
| S/N ratio (IHF-A) |
PHONO (MM): 91dB or more,
PHONO (MC): 75dB or more
LINE: 105dB or more |
| Volume adjustment |
New LECUA1000 |
| Amplification circuit |
ODNF 4.0 |
| Output configuration |
Bipolar parallel push-pull |
| Damping factor |
200 |
| Max. amount of tone control |
BASS: ±8dB at 100Hz
TREBLE: ±8dB at 10kHz |
| Power supply |
230V~(50Hz) / 115V~(60Hz) |
| Power consumption |
230W
170W (under no signal), 0.5W (at standby) |
| External dimensions |
440(W) x 178(H) x 454(D) mm
front side knob of 20mm and rear side terminal
of 27mm included in depth |
| Net weight |
24.3kg (main unit) |
| Accessories |
Remote control (RA-17A)
Power cable |
| Speaker terminal Supported Y-lug terminal dimension |
Width of part a: 15mm or less
Width of part b: 8mm or more
* Connection may not be performed
depending on the shape of the
Y-lug terminal. |
