Luxman M-900u


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M-900u To bring out the best sound expression The stereo power amplification, M-900u, has been created to bring out the best sound expression from the speaker system. The rich gradation sound quality has been achieved from deep bass sound to clear high tone with sufficient drive force acquired 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 has been evolved to the latest version 4.0. The transparent large analog 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 the user to use the unit as an ultra-high power monaural amplifier of 600W (8Ω). * ODNF is an abbreviation for "Only Distortion Negative Feedback". 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. 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). Therefore, the unit can be ready with leeway for a sound source that requires high energy in a moment and drive speakers in any circumstances without being affected by change in speaker impedance. In addition, the BLT connection allows the user to use the unit as a monaural amplifier with the rated output of 600 W (8Ω). For the circuit configuration with this mighty power, 1 module of 3-stage Darlington and 4-parallel push-pull amplification circuit that is most excellent in sound quality according to our experiences of amplifier development for a long time and 4x2 output in which 2 modules are combined per a channel are used. The effect of the counter electromotive force from a speaker is suppressed by maintaining the damping factor to 710, and overwhelming power linearity to drive the speaker unit is achieved. The latest version, 4.0, of the ODNF circuit that performs feedback of only distortion components is introduced to the amplification circuit. Then, both the merits of NFB (negative feedback), i.e. low distortion and wide-band characteristics, and the features of a non-feedback amplifier, i.e. quick response and natural tone quality are provided. The ODNF circuit version 4.0 has the improved accuracy of detecting distortion with use of 3 parallels of the first stage of the error detection amplifier. The expressive power of silence has been improved and the sound emotion is finely and heavily expressed by minimizing the feedback amount, reducing the distortion at high frequencies or low sound volume, and reproducing minimal sound data precisely. 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 space, minimizing the capacity between lines, reinforcing the unifying force, stabilizing 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. Power can be sufficiently supplied to fully drive the speaker unit. Spec 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.

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