L-550AXII is a Mark 2 model of L-550AX which launched in 2011. L-550AXII makes its debut featuring a high-precision electric controlled attenuator LECUA and the latest version of proprietary high sound quality feedback circuit ODNF4.0, both are used in LUXMAN’s upper range amplifiers.
Keeping the symbolic appearance with traditional pointer-type meters on the front panel, the essence of the expressive power that made a huge step forward whilst developing the flagship integrated amplifier L-590AXII was poured into this model to provide its dense expression particular to pure A class sound and more detailed reproduction of the low range.
The L-550AXII is a solid-state integrated amplifier to incorporate a truly lossless volume control and superior audio circuitry. With an illuminated central oriented VU meter in its solid, symmetrical front fascia, the L-550AX incorporates the LECUA 1000 high precision electronically controlled attenuator, the latest ODNF 3.0A audio circuit and custom passive components as used in Luxman’s flagship C-1000f control amplifier and B-1000f mono power amplifier.
The LECUA 1000 attenuator is configured to electrically block electromagnetic (EMI) and radio frequency (RFI) interferences. The output signal is attenuated without introducing artifacts inherent of conventional volume controls, thereby resulting in constant output impedance, high signal-to-noise ratio, a uniform frequency response and lowered distortion. As its name implies the ODNF (Only Distortion Negative Feedback) only applies negative feedback where distortion is present to reduce colouration more effectively.
This lossless audio circuit enables the amplifier to retrieve every musical nuance captured by recording engineers. Transient response, attack, dynamic contrast, timbre, inner detail, and bass authority are preserved.
|Rated Output||2 x 20W RMS / 8 2 x 40W RMS / 4|
|Input Sensitivity / Impedance||Phono (MM): 2.5mV / 47k
Phono (MM): 0.3mV / 100k
Line:180mV / 42k
|Total Harmonic Distortion||0.007%|
|Frequency Response||20Hz ~ 100kHz (-3dB)|
|Line Inputs||4 x LINE, 1 x Balanced, 1 x MM/MC (switchable), 1 x TAPE, 1 x Power Amp in|
|Line Outputs||1 x Pre-Amp out, 1 x TAPE, 1 x headphones|
|Speaker Outputs||Speaker A/ B switchable, Speaker A+B|
|Dimensions (W x H x D)||440 x 178 x 454 (mm) (including control knobs and terminals)|