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To bring out the best sound expression

The M-900 Stereo/ Mono Power amplifier has been created to bring out the best sound from your speaker system.

The rich sound quality has been achieved from deep bass to clear high tones with sufficient drive achieved by connecting the 4-parallel push-pull structural output units in parallel.

Luxman’s original ODNF circuit that provides both a lively feeling and ultra-low distortion, this has evolved to the latest version 4.0.

The transparent large analogue meter produces the enjoyment of listening to music with finesse, and the exterior design with blasted white finishing encloses high power gently.

The BLT connection allows you to use the unit as an ultra-high power monaural amplifier of 600W (8Ω).

* ODNF is an abbreviation for “Only Distortion Negative Feedback”.

High power ODNF amplifier with 4×2 output structure, which has achieved overwhelming power linearity of up to 1,200W (1Ω)

The role of the power amplifier is to amplify sound signals from the control amplifier in faithful accordance with inputs and to vibrate the speaker units precisely.

To perform these tasks, the great drivability and firm linearity of the output circuit are essential.

The M-900u has not only acquired sufficient rated output of 150 W + 150 W (8Ω), 300 W + 300 W (4Ω) but also achieved instantaneous maximum output of up to 1,200 W + 1,200 W (1Ω).

In addition, the BLT connection allows you to use the unit as a monaural amplifier with the rated output of 600 W (8Ω).

Large-capacity super-regulation power transformer


The high-performance EI type super-regulation transformer is placed on the power supply unit to support the high power of M-900u with the aim of eliminating the loss of space, minimising the capacity between lines, reinforcing the unifying force, stabilising the magnetic field, and more by winding the flat-type copper coil tightly.

The regulation performance that is not affected by any load fluctuation is achieved owing to the large capacity of as much as 1,250 VA.

Thoroughly low impedance transmission

To provide the power of the heavy-duty power supply circuit supplied from the large-capacity block capacitor of 20,000μFx4 to the amplification circuit instantaneously without any loss, the main electric current line between the power supply unit and output stage is directly connected by hardwiring using a extremely thick OFC bus bar.

What’s more, to transmit the powerful drive force generated by the large-scale output circuit without loss, the large-capacity speaker relay with low resistance in which 4 contacts are connected in parallel is equipped.

The overwhelming value of the damping factor, that is 710, has been achieved.

Large needle meter that shows how the sound really moves

A large-scale needle-type meter is introduced to provide not only audible sensation but also physical sensation for the lively feeling of sound.

The electric bulb colour of the LED illumination is the result of Luxmans persistence in visibility.

The meter is equipped with the ON/OFF switch for operation and the ON/OFF switch for illumination.

For M-900u, up to 12 W of the output is operated with pure class A.

In this case, the meter reads -10 dB or so, and the inclusion of almost all of the ordinary volume range balances between high power and dense sound quality with pure class A.

Highly rigid chassis structure supporting heavy parts

A stray current in the chassis generated by the ground loop may cause the deterioration of sound quality such as increase in impedance and magnetic field generation.

To prevent this, M-900u uses the loopless chassis that does not have a ground loop.

The gradation cast-iron is used for the legs to shut off external vibrations and relieve internally generated vibrations.

The chassis has a structure to hold heavy parts firmly and an appearance to show overwhelming presence and to be covered with blasted white neatly, which leads to the combination of strong and calm design.

Specifications M-900u

Rated output  Speaker terminal Supported Y-lug terminal dimension
Instantaneous max. output  1,200W + 1,200W (1Ω)/at stereo 2,400W (2Ω)/at monaural
Input sensitivity  1.24V/150W (8Ω) GAIN 29.0dB
Input impedance  Unbalanced 51 kΩ Balanced 34 kΩ
Frequency response 20Hz to 20kHz (+0, –0.1dB) 1Hz to 130kHz (+0, –3.0 dB)
Total harmonic distortion rate 0.008% or less (1kHz/8Ω) 0.1% or less (20Hz to 20kHz/8Ω)
S/N ratio (IHF-A)  117dB
Amplification circuit ODNF 4.0


Output configuration  Bipolar 4-parallel push-pull x 2
Power transformer EI type 1,250VA
Damping factor  710
Power consumption  540W 280W (under no signal) 1.0W (at standby)
External dimensions 440(W) x 224(H) x 485(D) mm front side knob of 2mm and rear side terminal of 38 mm included in depth
Net weight 48.0kg
Accessories Dedicated remote cable,  Power cable
Speaker terminal Supported Y-lug terminal dimension Width of part a: 14mm or less Width of part b: 7mm or more
* Connection may not be performed depending
on the shape of the Y-lug terminal.