FM 811 & 811-MKII

Unequalled for 18 years: the FM 811
Unequalled for 18 years: the FM 811

The FM 811 and its MKII incarnation has opened the ears of thousands of music lovers and won every possible accolade. After 18 years of continuous production it will finally be faded out. It has set standards unmatched until this day but the introduction of the FM 1811 with its new technology has such an impact that all efforts have to be concentrated on crafting FM 1811's.
There is no doubt the FM 811 and its MKII incarnation will always been highly sought after and understandably so.

The reason for its "retirement" has only to do with the fact that some of the newest technologies that have been used in the FM 1811, FM 115 and the FM 411-MKII cannot be incorporated in the FM 811 MKII - which makes it impossible to develop it further.

But no tears need to be shed: the FM 1811 provides even higher resolution, incorporates all new technologies and provides massively higher drive capability into complex (real-world loudspeaker) loads at the same size and weight. It will continue the uncanny tradition of the FM 811's unsurpassed musicality at an even higher level.

The FM 811 provides - and will continue to do so - an amazing realism of performance.

It's more than nostalgia that we feel for the FM 811 which has established on a worldwide basis the singular reputation of FM ACOUSTICS.

A Few Specifications

Minimum Power Output:
  900 W peak into 8 Ohms
1700 W peak into 4 Ohms
3000 W peak into 2 Ohms

  455 W RMS into 8 Ohms
  850 W RMS into 4 Ohms
1500 W RMS into 2 Ohms

Max. Output Voltage: 180 V pp.

Max. Output Current:
Absolutely unlimited peak current.More than 60A continuous per channel allows the FM 811 to drive any known load without any negative influence on the audio signal. No fuses, absolutely no form of current, voltage or any other kind of limiting.

Distortion: Average distortion: 0,005% THD
Gain: 30.5db

Bandwidth including Input Filter:  (-3dB)
1 Hz to 60 kHz.
If required, internally settable 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:  (20Hz-20kHz).
Below full power typically: -115 dB
Min. unweighted: better than -100dB

Input Sensitivity:
1,2 V RMS for full output

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

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. Designed for 1 Ohm to 10'000 Ohm systems. 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 onboard computer that continuously surveys all important parameters.


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8132 Egg b. Zurich



Phone:  + 41-44-7257777

Fax:     + 41-44-7257790


Last updated : 23.04.2024