FM ACOUSTICS Resolution Series FM 711-MKII

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...to be able to announce the "MK-II" version of the FM 711.
The original FM 711 was exclusively made for Japanese music aficionados. In 2008 the exclusivity commitment has been completed and as the FM 711 is such an outstanding amplifier it was decided to continue crafting this marvel. Included in the new MKII version are all recent developments and ameliorations developed for the FM 1811, FM 115 and the
FM 411-MKII.

Massive power

FM 711-MKII
FM 711-MKII

The more massive power supply of the MKII is uses high speed dual rectifiers of high current capacity.

Level control

FM 711-MKII
FM 711-MKII

Sealed long-life level controls use a conductive plastic track rather than the usual carbon or cermet track. In addition to much longer life expectancy this provides better resolution and guarantees no noise.

HR modules

FM 711-MKI
FM 711-MKI

The new HR modules are used on the inputs. They help to achieve an astounding 100dB (!!!) of rejection of Common Mode signals (such as interference, hum, noise etc. which must be cancelled out before the amplification stages). They rend the FM 711-MKII immune against interference. This CMRR rejection is achieved not with cheap op amps but with individually fine-tuned discrete Class A circuits guaranteeing the ultimate resolution FM ACOUSTICS products are esteemed for.

Light bulb

FM 711-MKI
FM 711-MKI

Light bulb changes are a thing of the past.
FM ACOUSTICS' new frontpanel display provides a more even light distribution and uses high reliability LED's instead of incandescent light bulbs.
These LED's have a theoretical lifetime in excess of 100'000 hours (we could not really test them for that long so let's hope the specifications are realistic...).

Longer lifetime.

FM 711-MKI
FM 711-MKI

Another small detail: left the new ultra-bright bulb now used for the mains power switch illumination. The cost is 3000% higher than the good old "long life" light bulb on the right (which needs replacement after a while - depending on quality of mains power). The new lamp uses dozens of LED's encased in its housing achieving higher brightness and much longer lifetime.
It is compatible and can also be used in the MKI version of the amplifier upon request (although not free of charge - for the above reason).

Resonance-eliminator support

FM 711-MKI
FM 711-MKI

To avoid negative influence from spurious resonance and guarantee positive coupling the 711-MKII employs FM ACOUSTICS unique resonance-eliminator supports. These isolate the unit from potential resonances making the unit immune to parasitic resonances.

With its unique characteristics the FM 711-MKII will be uncontested for many years to come:

  • Music reproduction to dream of
  • Prodigious Power to drive the most demanding loads
  • Proprietary discrete circuitry using special curve-tracer analysed and hand selected semiconductors
  • Superb balanced discrete Class A input stage. Sensors automatically recognize the connection standard and perfectly balance both unbalanced and pseudo-balanced signals sources right at input
  • Tremendous headroom and reserves
  • Perfect signal symmetry
  • Superb rejection of noise, hum or interference thanks to perfectly balanced inputs (interference rejection is 100-1000 times better than other so-called "balanced" equipment)
  • Multi-protection systems for amplifier and speakers trigger the output and reset automatically when the error disappears.
  • No signal compression, limiting nor any other negative influence on the audio signal is possible. The protection circuits are totally separate from all audio stages.
  • Outputs drive any speaker load perfectly, even very low impedance - or high highly capacitive - transducers
  • Unique dynamic damping of speakers results in perfect impulse response and no ringing
  • Proprietary enhanced Class A circuitry provide unmatched musicality
  • Grand Prix-winning circuit technology guarantees total absence of any form of distortion - be it dynamic or static and even at the lowest signal levels - it betters other designs by a magnitude.
  • Precision low noise level controls avoid the often experienced change in tonal characteristics when changing volume level
  • Ultra low-loss FORCEPLUG 200 output connectors.
  • Tremendous output current capability as peak output current is not limited
  • 5000V mains spike suppressors
  • Mechanical resonance elimination with FM ACOUSTICS' new isolation supports
  • Lowest impedance power supply for unlimited rendering of dynamics
  • The internal transformer is completely shielded from audio circuitry; special shielding techniques prevent stray fields
  • Hand-selected and perfectly matched components of DIN, IEC & MIL standard
  • Each unit is hand crafted and calibrated in Switzerland to absolute performance standards
  • New high reliability components help to further increase lifetime expectancy

 

Specifications

Minimum Power Output:
520 W peak into 8 Ohm
1000 W peak into 4 Ohm
1600 W peak into 2 Ohm

260 W RMS into 8 Ohm
500 W RMS into 4 Ohm
800 W RMS into 2 Ohm

 

Max. Output Voltage: 140 V pp.

 

Max. Output Current:
Unlimited repetitive peak output current. More than 35 A continuous per channel. No output or DC fuses, absolutely no form of current-, voltage- or any other kind of limiting.

 

Distortion: 0,005% THD

 

Bandwidth including Input Filter:
Less than 1 Hz to 60 kHz;
if required, internally setable to any frequency between 1 kHz and 60 kHz (Low-Pass) and
1 Hz to 1 kHz (High-Pass).

Risetime at Full Power: 3 us

 

Hum and Noise:
Below full power typically -110dB
Minimal unweighted:
better than -100 dB

Input:
Proprietary electronically balanced discrete enhanced class A circuitry, floating ground, non- inverting or inverting mode. Optimal performance with either balanced or unbalanced (single-ended) sources. Unbalanced sources are automatically balanced right at the input of the FM 711.

 

Input Sensitivity:
1,6 V RMS for full output

Input Impedance:
At all level settings from balanced and unbalanced sources: 40 kOhm

Input Stage Common Mode Rejection:
100 dB typically, better than 90 dB at 50 Hz, even better at other frequencies.

Load Impedance:
No minimum impedance. The amplifier is designed for 1 Ohm to 10'000 Ohm systems. It can drive any speaker impedance (even below 1 Ohm) with dynamic (music) signals without any limiting, compression or other negative effects on the audio signal. Despite this, the amplifier is fully protected against short circuits, open circuits and all other adverse conditions via a unique on board computer that continuously surveys all important parameters.