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This power amplifier is a new middle range model that inherits our powerful drive circuit including the latest version, ODNF 4.0. Free Shipping to the Continental US only !
Longing dream comes true Flagship pedigree of exquisite sound
M-700u, a power amplifier, is a new middle range model that inherits our powerful drive circuit including the latest version, ODNF 4.0 circuit whose distortion characteristics and S/N performance have been significantly improved and with which the top-end model, M-900u, has been equipped and also including 4-parallel push-pull structure with 3-stage Darlington to pursue Luxman's development philosophy for power amplifiers, "satisfying both high drivability and sound quality of high density". The output from 120 watt @ 8 Ω to up to 840 watt @ 1 Ω instantaneously exploits the full potential of speaker characteristics under any load conditions. M-700u is a new-generation stereo power amplifier that combines richly expressive sound and high power without losing the music dynamism.
High-power 4-parallel module, ODNF circuit, version 4.0
A powerful drive circuit is necessary to amplify sound signals from a control amplifier with high fidelity and to exploit the performance of various speakers. M-700u has achieved the output of up to 840 watt + 840 watt @ 1 Ω instantaneously from the rated output of 120 watt + 120 watt @ 8 Ω and 210 watt + 210 watt @ 4 Ω. Speakers can be driven with its sufficient power under any load conditions. Moreover, the BLT mode allows the user to use the unit as a monaural amplifier with the rated output of 420 watt @ 8 Ω. A 4-parallel push-pull structure with 3-stage Darlington is used in this circuit to acquire such high power. The latest version, ODNF 4.0 circuit, that has achieved primary slew rate speed indicating the startup performance by feeding back only distortion components, ultra-wide bandwidth, and low level of distortion is adopted for the amplifier circuit, which is inherited from M-900u, our top-end model. Precise reproduction of a small sound signal has enhanced the elaborate sound expression and the expressive capability of tranquillity. Setting up to 6 W with which sound range can be practically and sufficiently acquired to the Class A operation range, it has made its high power consistent with sound expression of high density.
* ODNF is an abbreviation for "Only Distortion Negative Feedback".
M-700u is equipped with high-performance EI type power transformer whose rated capacity is as much as 550 VA with a reputation for its tone quality full of dynamism including bass range perseverance to support overwhelmingly powerful power supply unit. A high level of regulation ability that is unshakable by any load fluctuation has been achieved.
In order to transmit the powerful drive force generated by the large-scale output circuit without any loss, super-thick wires for major current systems and large-capacity speaker relays with low resistance in which 4 contacts are connected in parallel are equipped. Transmission of thoroughly low impedance has been achieved, and 350 of the damping factor has been accomplished.
The combination of block capacitor with high-capacity of 80,000 μF ( 10,000 μF x 8 ) whose right and left channels are independent and a power transformer configures high-inertia power supply that offers both instantaneous force and a sense of stability. This unit supports the performance of M-700u from the bottom and delivers the sound dynamism amazingly.
The beeline construction is adopted, which makes the internal configuration of the power amplifier reasonable and also makes the wiring route shortest. The traditional wiring pattern of the substrate with use of copper foil of approx. 100μm in thickness allows highly pure signal transmission to be achieved.
A large-scale needle-type meter is adopted to provide not only audible but also physical sensation for the lively feeling of the music. The electric bulb color of the LED illumination is the result of our persistence in dignity and visibility. This meter can be switched in 3 steps with use of the switch on the front panel as follows: Operation ON / Light ON → Operation ON / Light OFF → Operation OFF / Light OFF.
A loopless chassis structure is used for the cabinet to eliminate increased ground impedance and the effect of generated magnetic field. Gradation cast-iron insulator legs are attached to prevent resonance thanks to its characteristics of that the metallic structure becomes smaller from the center to the periphery of the leg.
M-700u consists of original custom parts, considering the sound quality as the first priority, such as resistances, capacitors, even all wires, which have been generated from Luxman's highly advanced know-how and sensibility accumulated in producing audio products for a long time. Those parts have contributed to realize-rich tone that Luxman has pursued.
|Rated output||120 watt + 120 watt @ 8 Ω in stereo
210 watt + 210 watt @ 4 Ω in stereo
420 watt @ 8 Ω in monaural
|Instantaneous maximum output||840 watt + 840 watt ( @ 1 Ω in stereo )
1,680 watt @ 2 Ω in monaural
|Input sensitivity||1.1 Volt / 120 Watt ( 8 Ω )
GAIN 29.0 dB
|Input impedance||Unbalanced 51k Ω
Balanced 34k Ω
|Frequency response||20 Hz to 20k Hz ( + 0, – 0.1 dB )
1 Hz to 130k Hz ( + 0, – 3.0 dB )
|Total harmonic distortion rate||0.009% or less ( 1k Hz / 8 Ω )
0.1% or less ( 20 Hz to 20k Hz / 8 Ω )
|S/N ratio ( IHF-A )||115 dB|
|Amplification circuit||ODNF 4.0|
|Output configuration||Bipolar 4-parallel push-pull|
|Power transformer||EI type 550 VA|
|Power consumption||370 Watt
110 Watt with no signal
0.4 Watt in standby
|External dimensions||440 ( W ) x 190 ( H ) x 427 ( D ) mm
front side knob of 2mm and rear side
terminal of 38 mm included in depth
|Net weight||27.5 kg|
|Accessories||Dedicated remote cable
|Speaker terminal Supported Y-lug terminal dimension||Width of part a: 14 mm or less
Width of part b: 7 mm or more
* Connection may not be performed depending on the shape of the Y-lug terminal.
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