Luxman L590AXII Class A Amplifier
New LECUA*1000 Volume Control circuit
We say: volume controls design impacts sound quality. As the volume is changed, the power amplifiers section "sees" a changing impedance and sound quality is affected. Volume controls also degrade over time. Luxman provides a reliable alternative here:
The newly developed integral LECUA1000 computerized attenuator with an 88 step amplifier circuit has been mounted in the volume adjustment unit, that is, for the first time as LUXMAN’s integrated amplifier, an essential part of the pre-amplifier circuit. This pre-amplifier circuit uses the same design as the top end control amplifier, the C-900u. The LECUA 1000 enables the sound volume to be adjusted smoothly with minimal deterioration of sound quality. A 3D layout has been introduced in the LECUA 1000 that allows substrates to be placed in three dimensions with the attenuator circuit directly connected to the amplification circuit, thereby minimizing routes and improving efficiency. Furthermore, this type of layout is extremely insensitive to external vibration and changes in sound quality caused by the volume level and has high durability.
Design Details - to achieve a high-speed primary slew rate, an ultra-wide bandwidth, and a low level of distortion
We say: In order to avoid distortion, amplifiers commonly use global negative feedback - that is a way of feeding the error signal (distortion) back to the input and subtracting the error. This works, but not with short bursts of sound, that are to short-lived for feedback to work. These short bursts of sound are transients, or attack - and music is full of them. Every time a guitar string is plucked, or a drum is hit, amplifiers using negative feedback would distort the transient. Luxman overcomes this shortcoming as follows:
innovative amplification feedback circuit
The ODNF (Only Distortion Negative Feedback) original amplification feedback circuit from LUXMAN features a fast primary slew rate and an ultra-wide bandwidth achieved through the feedback of distortion components only from output signals. The L-590AXII is equipped with the latest version of ODNF - Version 4.0 - in which the distortion characteristics at high frequencies as well as the S/N performance have been significantly improved. Version 4.0 also features a power amplifier circuit in which a 3-parallel push-pull structure with 3 stage Darlington is used, as featured in the LUXMAN M-700u power amplifier.
Class A amplification
A rated output of 30W +30W (8Ω) of pure class A amplification achieves a mellow, expressive sound with a heightened sense of density with high drivability to speaker systems.
Large-capacity power supply circuit
A high inertia power supply circuit with a high regulation large capacity power transformer and a large block capacitor of 80,000μF (10,000μF x 8) in a LR independent manner have been combined to achieve both instantaneous power andstability. A high level of regulation is achieved by increasing the diameter of the primary winding of the power transformer.
High level of damping factor
To transmit the powerful drive force that is generated by the large scale output circuit without loss, a large low resistance speaker relay in which 2 contacts are connected in parallel has been incorporated into the design. Lowering impedance right to the extent of the speaker terminals improves the damping factor significantly from 240 (the value of the L-590AX) to 320 resulting in vibrant sound reproduction.
Low impedance transmission
The combination of LUXMAN original OFC wire used in the internal wiring and the round pattern incorporated in board wiring which enables smooth signal transmission allows for Beeline construction in which audio signals are configured with the optimal and shortest route, further contributing to lower impedance transmission.
Discrete buffer circuit
Discrete buffer circuits equivalent to the ones used in the LUXMAN C-900u, the flagship model of LUXMAN separate amplifiers, is mounted on the output stage of the pre-amplifier circuit, protecting the purity of the audio signals whilst simultaneously enhancing the drive force for the power amplifier. The L-590AXII is equipped with not only a custom power transformer and block capacitors but also with many custom built parts featuring sophisticated technologies. These custom parts and features have been improved through thorough listening tests on passive parts including resistors, input/output terminals and various wires.
New pointer type analog meter
A newly designed, highly visible meter panel and LED lit ‘pointer’ type analog meters featuring a highly responsive meter unit are used in the L-590AXII. The sophisticated hairline finish on the top panel of the blaster white main unit exudes elegance and quality of design.
The L-590AXII features an electronically controlled bass/treble type tone control function with LR balance adjustment utilising LECUA’s volume shifting function, equipped with loudness function interlocking with sound volume and pre/power separation functions. The L-590AXII is also equipped with a phono amplifier that is compatible with MM/MC cartridges. Thus, the L-590AXII has a high functionality specific to an integrated amplifier.
Loopless chassis structure
The solid structure of the loopless chassis of the L-590AXII eliminates ground impedance increase. The speaker terminals (A and B) are positioned inline and are compatible with Y lugs to enable easy connection with extra-thick speaker cables. A headphone terminal is also provided.
Gradation cast-iron insulator leg
The gradation cast-iron insulator legs supporting the L-590AXII cut out any unnecessary external vibration and hold the weight of the unit securely.
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|Rated output||30W + 30W (8Ω), 60W + 60W (4Ω)|
|Input sensitivity/input impedance||PHONO (MM): 2.5mV/47kΩ
PHONO (MC): 0.3mV/100Ω
|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||0.005% 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: 107dB or more
|Volume adjustment||New LECUA1000|
|Amplification circuit||ODNF 4.0|
|Output configuration||Bipolar 3-parallel push-pull|
|Max. amount of tone control||BASS: ±8dB at 100Hz
TREBLE: ±8dB at 10kHz
|Power supply||230V~(50Hz) / 115V~(60Hz)|
260W (under no signal), 0.5W (at standby)
|External dimensions||440(W) x 193(H) x 463(D) mm
front side knob of 20mm and rear side terminal of 37mm included in depth
|Net weight||28.4kg (main unit)|
|Accessories||Remote controller (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