ODNF* Version 4.0 - innovative amplification feedback circuit
An integral part of the design of the L-509X is LUXMAN's original ODNF* amplification feedback circuit, featuring a high-speed primary slew rate, an ultra-wide bandwidth and a low level of distortion that is achieved by feeding back only the distorted components of the audio signal from the output of the amplification circuit. The L-509X is equipped with the latest Version 4.0 ODNF providing a dramatic enhancement of accuracy in distortion detection due to the triple-paralleled first stage error detection circuit. Lower impedance and a higher signal to noise ratio have been achieved due to the paralleled first stage and Darlington equipped second stage amplification circuit. A 3-stage Darlington circuit and a 4-parallel push-pull structure is used for the output stage, similar to the M-700u power amplifier. This achieves output at 120W+120W(8Ω) and 220W+220W(4Ω), enabling the L-509X to drive speakers powerfully with rich dynamics and full expression. *ODNF stands for “Only Distortion Negative Feedback”.
Chassis structure exemplifies excellence in function and design
The L-509X features a top panel with a beautiful hair-line finish and widened venting to improve heat dissipation. The loop-less chassis structure restricts any increase in ground impedance. Analog level meters, illuminated with white LEDs, add to the elegant and stylish appearance.
An abundance of user-friendly functions
The L-509X is equipped with a high-quality phono amplifier, compatible with MM and MC cartridges. This model offers all the functions that a high quality integrated amplifier should, including bass and treble tone controls, L/R balance adjustment controlled by LECUA, pre/power separation function, volume control and headphone output, all integrated into a single unit without compromising sound quality.
Copper alloy terminals
High quality RCA terminals, made of copper alloy, are used for the LINE-1 inputs of the L-509X, combining the beneficial conductivity of copper and durability of brass. The L-509X features many custom-made components befitting a flagship model, such as the robust power supply and high-grade speaker terminals that are compatible with Y-connectors.
New LECUA*1000 computerized attenuator
LUXMAN's New LECUA1000 is at the heart of the preamp section and the volume adjustment control of the L-509X. This computerized attenuator is integrated with the amplification circuit, a feature integral to the high-end LUXMAN C-900u control amplifier. LECUA provides an ideal level control system which allows smooth and fine adjustment of the volume over 88 steps, thereby minimising the deterioration of audio quality at any point of the volume adjustment range. An advancement of the New LECUA1000 is the 3D design layout. The attenuator circuit board is directly connected to the amplification circuit board. Signal routing has been minimized andefficiency has been successfully enhanced. In addition, this design is extremely resistant to external vibration and eliminates changes in audio quality over the volume control range. The robust nature of this system ensures longevity and durability. *LECUA stands for “Luxman Electronically Controlled Ultimate Attenuator”.
||120W + 120W (8Ω),
220W + 220W (4Ω)
|Input sensitivity/input impedance
||PHONO (MM): 2.5mV/47kΩ
PHONO (MC): 0.3mV/100Ω
||REC OUT: 180mV, PRE-OUT: 1V
||PHONO: 20Hz to 20kHz (±0.5dB)
LINE: 20Hz to 100kHz (within -3dB)
|Total harmonic distortion
||0.007% or less (8Ω, 1kHz)
0.06% 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
||Bipolar 4-parallel push-pull
|Max. amount of tone control
||BASS: ±8dB at 100Hz
TREBLE: ±8dB at 10kHz
150W (under no signal),
0.5W (at standby)
||440(W) x 193(H) x 463(D) mm
front side knob of 20mm
and rear side terminal of 37mm included in depth
||29.3kg (main unit)
||Remote control (RA-17A)
|Speaker terminal Supported Y-lug terminal dimension
||Width of part a: 16mm or less
Width of part b: 7mm or more
* Connection may not be performed
depending on the shape of the