Features Of This Unit - Luxman L-550AXII Owner's Manual

Features of This Unit

New LECUA1000 — LUXMAN Electric
Controlled Ultimate Attenuator 1000
New LECUA1000, which is the integration of an amplifier cir-
cuit and a high-precision attenuator by electrically-controlled
fixed resistance switcheovers is mounted. Further fine sound
volume adjustable without deterioration of sound quality from
0 dB through −87 dB
ODNF — Only Distortion Negative
Feedback —
The amplification feedback circuit that has acquired the high-
speed primary slew rate and ultra-wide bandwidth by feeding
back only distortion components generated during amplifica-
tion to maintain the pure sound quality of the main-amplifier
that is almost non-feedback.
The newest version, 4.0, has achieved the low impedance
and high S/N ratio of the transmission circuit thanks to paral-
lelized first stage and Darlington-connected second stage of
the amplification circuit. In addition, the input stages of the er-
ror detection circuit are parallelized to moderate the distortion
characteristic and to eliminate noise.
Parallel push-pull output stages
Parallel push-pull structure of bipolar transistors.
Pure class A rated output 20 W+20 W (8Ω).
2
High-inertia power supply
High-inertia power supply circuit that combines a large-ca-
pacity EI-core-type power transformer with original 10,000 μF
× 4 capacitor blocks.
Parallel speaker relays
This unit is equipped with 2 large parallel speaker relays with
a low resistance value to reduce the impedance of the speak-
er output lines.
Beeline construction
Newly designed beeline construction makes the audio input
signals to be conveyed via the optimum and shortest route to
the speaker output.
Selector switch IC
Selector switch IC of high sound quality, which is used in the
top-end control amplifier, C-900u, improves the separation
and crosstalk performances.
Schottky barrier diode
Application of Schottky barrier diode manufactured by Nihon
Inter Electronics Corporation that has less switching noises
and higher conversion efficiency to the DC voltage for the
power supply rectifier circuit.
LUXMAN's original OFC wires
Our original OFC wires are used in the internal wiring to
achieve smooth signal transmission thanks to the spiral wrap
shielding on each core and the non-plating process on the
core wire.