Welcome - the FM 1811-MKII is here - another calibre...

Evolution or Breakthrough? Both. The winning combination results in the ultimate Resolution Series Amplifier
Evolution or Breakthrough? Both. The winning combination results in the ultimate Resolution Series Amplifier



The fascinating FM 1811-MKII is the culmination of FM ACOUSTICS efforts in 50 years of the most dedicated R&D.


No need for many words: the Resolution Series® 1811-MKII delivers the ultimate in highest accuracy music reproduction.



The FM 1811-MKII is the standard of excellence.



Dozens of refinements of FM ACOUSTICS' unique circuits are combined with features like:


  • New symmetrical input stage modules provide the highest symmetry and most

  • Ultra high-linearity driver stages

  • Dual chassis for resonance elimination

  • The most dramatic output stages ever created provide absolute linearity even at ultra high voltage and current

  • Silent operation contributes to the FM 1811-MKII's dramatic dynamic rendering..

  • Highest efficiency cooling with thermal envelope optimization

  • Multiple custom-made components of singular standard and quality

  • Custom made capacitors to proprietary specifications guarantee ultimate performance and reliability

  • Phenomenal hand-assembled, layered and frozen transformer uses unique specially-treated high efficiency steel and weighs only 21 kg (which is "light" for this power)

  • includes unique "tuned anti-resonance" isolators

  • Thermal envelope optimization reduces power consumption

  • apart from all parts selection procedures, test and calibration of all pre-assemblies, every single unit undergoes multiple pre- and final tests - by three different engineers on every single unit.

  • Every single unit is crafted by hand to special order at FM ACOUSTICS facilities in Switzerland
Not a power station; the highest resolution power supply.
Not a power station; the highest resolution power supply.
The heart of the matter...
The heart of the matter...

intrinsic musicality


Of course, all characteristics that have made FM ACOUSTICS amplifier world renown - like singular discrete circuits, individually fine-tuned and hand calibrated FM ACOUSTICS enhanced class A stages, use of Listening- and hand-selected semiconductors and many more proprietary solutions - are incorporated.

The Resolution SeriesÒ 1811-MKII delivers absolutely incredible realism and a "be there" experience that neither words nor technical terms can describe. Only a live demonstration will allow to realize the magnitude of this unique precision amplifier.

The FM 1811-MKII drives any speaker to a performance level that could never have been imagined. To be able to fully deliver its promise the FM 1811-MKII requires a high-level, ultra low-impedance mains supply to deliver its promise. A dedicated supply that can provide a minimum of 125A peak / 25A cont. at 120V   (or 60A peak / 12.5A cont. at 230V) with absolute stability is mandatory.



Some Specifications

Specifications are often misused, misunderstood or utilized only to sell a product instead of indicating its actual performance capabilities. “Typical” specifications do not tell much about the true value of a certain component. Only guaranteed minimum data - as specified for all FM ACOUSTICS products - together with carefully controlled listening tests will provide accurate and useful information. These distinctions must be observed when comparing to other specifications.


Minimum Power Output:
Per channel, both channels operating with continuous music or continuously repetitive toneburst:
1000 Wpeak into 8 Ohms
2000 Wpeak into 4 Ohms
3400 Wpeak into 2 Ohms

500 WRMS into 8 Ohms
1000 WRMS into 4 Ohms
1700 WRMS  into 2 Ohms
(Just for comparisons' sake as other manufacturers use such
ratings: the repetitive impulse power of the FM 1811-MKII equals 4600W per channel).

Max. Output Voltage:

184 V pp.

Max. Output Current:
Absolutely unlimited peak current. More than 80 A continuous per channel allows the FM 1811-MKII to drive any known load with optimal accuracy.
No fuses, absolutely no form of current-, voltage- or any other kind of limiting are employed.

Distortion:  inaudible

Gain: 30,1dB

Risetime at Full Power -3dB:               3 us   

Hum and Noise:   inaudible.
Below full power typically: -115 dB
Min. unweighted: > than -100 dB

Proprietary, electronically balanced, discrete enhanced class A circuitry, non-inverting or inverting mode.
Optimal performance with either balanced or unbalanced (single-ended) sources.
 Unbalanced sources are automatically balanced right at the inputs of the FM 1811-MKII.

Interference Rejection:
(noise, hum, RF etc.): better than 95 dB

Maximum Input Level:
+20 dBm

Load Impedance:
No minimum impedance. Designed for below 1 Ohm to above 10’000 Ohm systems. Can drive any speaker impedance - dynamic, electrostatic, ribbon, planar etc.- without any form of limiting, compression or other negative effects on the audio signal. Despite this, the amplifier is fully protected against short circuits and all other adverse conditions via a unique on-board system that continuously surveys all important parameters.


Proprietary protection systems safeguard against adverse conditions such as short circuit, open circuit, HF Oscillation, RF interference, +DC and -DC offset, parasitic frequencies, overtemperature, damage to the protection system itself, etc.

Chassis Resonance Damping:
Dual chassis design effectively isolates sensitive electronic and mechanical components from potential induced resonances. Uses specific anti-resonance technology.

Average Life Expectancy:
At 25oC ambient temperature, medium power, 10h/day, 365 days/year: 40 years.

Power Consumption:
At idle:                   200 WRMS
At 30% power:       1400 WRMS
At full power:         3600 WRMS
With dynamic signals:

10000 Wpeak repetitive

Mains Supply Requirement:
32A continuous, 130Ap at 110V - 120V

16A continuous, 65 Ap at 220V - 240V

Burn-in Time at Factory:
Minimum 100 hours (500 thermal cycles)   

Vibration Test at Factory:
Minimum 60 minutes (50’000 vibration cycles)

Output Connectors:
FORCEPLUG 200, ultra low-loss high-performance connectors.
Current handling = 1200Ap


(soldered to FORCELINES). For the FM 1811-MKII type "FORCELINES 3" are required to guarantee ultimate performance.

Spare Parts Availability:
Guaranteed available for a minimum of 10 years. Ex stock availability of 99% of all individual parts.

Only 47 kg net, 52 kg packed

445 mm wide
275 mm high
530 mm deep


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8132 Egg b. Zurich



Phone:  + 41-44-7257777

Fax:     + 41-44-7257790



Last updated : 23.04.2024