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 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 20W + 20W (8Ω), 40W + 40W (4Ω)Input, recording input and output line x 4, phono 1 (MM / MC switching), balanced line x 1, recording input and output x1, separate input separate input and output: and output x 1- speaker output A / B 2 system (AB simultaneous can be output)Amplifier circuit, output configuration ODNF4.0, bipolar parallel push-pullInput sensitivity / input impedance PHONO (MM): 2.5mV / 47kΩ, PHONO (MC): 0.3mV / 100Ω, LINE: 180mV / 47kΩTotal harmonic distortion less than 0.007% (1kHz / 8Ω), 0.02% (20Hz ~ 20kHz / 8Ω)S / N ratio, frequency characteristic LINE: 105dB or more, 20Hz ~ 100kHz (+ 0, -3.0dB)Power consumption 230W, 170W (when there is no signal), 0.4W (standby)Dimensions, (WxHxD) 440 × 178 × 454 mm (front knob 20, including the rear terminal 27)Weight 24.3kg
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