LUXMAN M-8f

Commentary

Stereo power amplifier equipped with ODNF circuit.

In addition to being used as a normal stereo power amplifier, it can also be used as a BTL connected monaural power amplifier.

It is equipped with a ODNF circuit developed by fundamentally reviewing the relationship between music signal and distortion in order to achieve high-dimensional music reproduction.
The ODNF circuit is equipped with an ultra-wide-band, high-slew rate, low-distortion circuit that does not require phase correction for the amplification circuit of the music signal. Phase correction, which cannot be avoided with conventional negative feedback circuits (NFB), is eliminated.
In addition, the conventional NFB method suppresses distortion for each music signal, causing band limitation and loss of music information content. However, in the ODNF circuit, only the distortion component is fed back from the output to the final stage of the amplifier circuit, and only the distortion component of the output waveform is removed. This achieves a high initial slew rate and ultra-wide bandwidth.
In addition, the DC servo amplifier for ultra-low frequency control, which had been the cause of unnatural coloring in the low frequency range in the NFB circuit, was eliminated, and the tone color of all bands is unified.

High-inertia power supply is used for the power supply section.
This circuit is equipped with a special electrolytic capacitor with excellent instantaneous discharge characteristics to minimize delay control by always keeping sufficient energy in the power supply.
It is also equipped with an independent 4-winding large power transformer of 800 VA and two large electrolytic capacitors of 22,000 μ Fx.

The chassis structure employs a highly rigid box isolation structure to prevent unwanted vibration and noise.
It is based on a 5-point FRP chassis base with excellent vibration absorption mode, and vibration noise is completely suppressed by firmly fixing parts to a thick chassis.
The layout is designed so that the power transformer, electrolytic capacitor, and amplifier block do not directly interfere with each other, and internal filters such as shielding each block with a shield plate are reinforced to eliminate interference from flux and noise.

We use custom-made parts exclusively for Luxman.
The resistor is based on a carbon film resistor with excellent sound quality, and has been examined in a wide range of areas including selection of alumina, which is a body porcelain, etching, carbonization, terminal material, terminal shape, and press-fitting method to improve the amount of information transmitted.
We also use custom parts such as power transformers, block capacitors, electrolytic capacitors, copper-styrene capacitors, copper bus bars, and high-purity cables.

Equipped with a large power meter of logarithmic compression display system.
With an acrylic thickness of 10 mm, this meter is designed with attention paid to the color of the light emitted and the illumination effect of the brand logo. It also has the function of turning the meter and lighting on / off.

The input section is equipped with independent left / right attenuators with 6-contact fixed resistors switching system for both balanced and unbalanced operation, and a reference position for obtaining 100W output at 1 V input for ease of use when combined with other models.

Equipped with a line phase sensor that senses the polarity of the AC power supply, setting can always be done with the correct polarity.

It uses an AC inlet type power connector and is compatible with the Luxman 10000 series power cable.

Model Rating

Type	Stereo power amplifier
Continuous effective output	When using stereo : When using monaural : 380W + 380W (4 Ω) 250W + 250W (8 Ω) 750W (8 Ω)
Input sensitivity	1V/250W (8 Ω)
Input impedance	Coaxial : 33k Ω Balance : 66k Ω
Total harmonic distortion factor	0.004% or Less (1 kHz, 8 Ω) 0.08% or Less (20 Hz ~ 20 kHz, 8 Ω)
Frequency characteristic	20 Hz ~ 20 kHz + 0 -0.1 dB 10 Hz ~ 100 kHz + 0 -1.0 dB
Signal-to-noise ratio	120dB(IHF-A)
Input terminal	Coaxial(RCA) L/R Balance L/R (Pin 3 +, Pin 2 -, Pin 1 GND at normal time)
Output terminal	Speaker terminal for banana plug
Attachment	Large power meter Power meter ON/OFF switch Standby indicator Muting indicator Attenuator / input selector switch BTL switch Remote terminal Remote switch Line phase sensor
Power supply voltage	100 VAC, 50Hz/60Hz
Power consumption	620W (Electrical Appliances and Materials Safety Act)
Maximum external dimensions	Width 467x Height 212x Depth 482 mm
Weight	40.5kg