Luxman M-900u ultimate

Planet Audio
Planet Audio

For 2015 Luxman are introducing a new flagship stereo amplifier, with first 12 watts in pure Class A and 150 watts x 2 (8 ohms) or 600 x 1 watts (8 ohms) when used as a monoblock. 

The new ODNF 4.0 reduces high frequency distortion and delivers a smooth midrange, utterly grain free. ODNF 4.0 ahs acqAs a stereo amplifier, the M900u is stable into a 1 ohm load, where it delivers 1,200 watts, peak power.

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The Luxman M-900U offers a powerful power supply with large capacity 20,000 μF × 4 block capacitors, OFC bus bar and direct hard wiring. The EI type transformer itself implements flat square shaped copper windings minimizing line capacity, enhancing binding force and providing excellent magnetic stability. Outputting an impressive 1,250 VA (instantaneous 2,500 VA), the M-900U has the power required to drive any speaker to peak performance.

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The M-900U also utilizes 4 large capacity output relays offering an incredible damping factor of 710. To eliminate stray magnetic fields and associated impedance rises, Luxman developed a loop-less chassis eliminating the possibility of ground loops within the M-900U chassis. Cast iron legs act as a resonance sink and quickly drain vibrations found within the unit.

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Luxman does not settle on ordinary components within its products. Rather, they design and build a large number of components found within the M-900U. Wiring, capacitors and even terminals are hand selected to meet the demanding standards at Luxman. Even the power cable was carefully designed. The JPS-15000 power cable utilizes the highest quality oxygen-free copper and take the last step in ensuring the purity of the sound.

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Gold Plated, Peel Coat Circuit Boards

Printed Circuit Boards normally have a green coat (dye) that can be printed upon, so the manufacturer knows where to place the copper traces and where to insert the resistors & capacitors. Luxman’s designers don’t like the sound of the green dye, in their extensive research they found that it smears the sound, so instead they print onto a plastic peel coat and remove it once the traces and mounting holes are in place. Then the copper traces are gold plated to reduce resistance across the circuit, as well as eliminate copper’s corrosion over time..

In the photo below you will notice that Peel Coat circuit boards are an off-white color, and that the traces are gold plated. It’s this fanatical attention to detail that delivers such superior sound quality.

 

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 Custom large capacity 20,000 μF × 4 block capacitors

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Rated output 150W +150 W (8Ω) / stereo at the time, 300W +300 W (4Ω) / stereo at the time,
600W (8Ω) / monaural
Instantaneous maximum output 1200W +1200 W (1Ω) / stereo at the time, 2400W (2Ω) / monaural
Input sensitivity 1.24V/150W (8Ω), GAIN 29.0dB
Input impedance Unbalanced 51kΩ, 34kΩ balance
Frequency characteristic 20Hz ~ 20kHz (+0,-0.1dB), 1Hz ~ 130kHz (+0,-3.0dB)
Total harmonic distortion Less than 0.008% (1kHz/8Ω), 0.1% or less (20Hz ~ 20kHz/8Ω)
S / N Ratio (IHF-A) 117dB
Amplifier circuit ODNF4.0
Output Configuration Bipolar 4 parallel push-pull × 2
Power transformer EI type 1,250 VA
Damping factor 710
Power-supply voltage AC230V (50 / 60Hz)
Power consumption 520W (under the provisions of the Electrical Appliance and Material Safety Law), 280W (no signal), 1.0W (standby)
External dimensions 440 (width)224 (height)485 (depth) mm, depth includes front knob 2mm, the rear terminal 38mm
Weight 48.0 kg (body),54.0 kg (standard packing)
Accessories Dedicated remote cable