...to be able to announce the
"MK-III" version of the FM 711.
The 711-MKIII is a mainstay of FM ACOUSTICS amplifier range.
Originally introduced in 1996 this singular high power amplifier enjoys a constant demand from many different countries. As it can drive anything that it is connected to with perfection, the FM 711-MKIII is here to stay for many many years.
Included in the new MKIII version are all recent developments and ameliorations developed for the FM 1811 and the FM 115.
With such a background, the refinements can, of course, not be "tremendous". They result in some smaller refinements but also some more substantial improvements - as described below.
The more massive power supply of the MKIII uses high speed dual rectifiers of very high current capacity.
Superb hand-craftsmanship is evident even where it is not visible (here a detail of the underside of the internal chassis). The quality of each hand-pressed connector is carefully inspected before assembly. The outstanding standard of hand-soldering (important for long-term reliability) is readily apparent.
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.
The new "HR" modules are used on the inputs. They help to achieve an astounding 100dB (!!!) of rejection of interference, hum, noise etc.
Such signals must be removed before the music signal enters amplification stages. The 711-MKIII is immune against interference.
This rejection is achieved highly selected components and individually fine-tuned discrete Class A circuits guaranteeing the ultimate resolution FM ACOUSTICS products are esteemed for.
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...).
To avoid negative influence from spurious resonance and guarantee positive coupling new resonance-eliminators are employed.
Initially introduced in the MKII series, the new MKIII isolators have improved isolation making the unit immune to parasitic resonances.
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. 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
better than -100 dB
Proprietary, electronically balanced, discrete enhanced class A circuitry, floating ground, non- inverting or inverting mode. Optimal performance with either balanced or single ended (unbalanced) sources. Unbalanced sources are automatically balanced right at the input of the FM 711-MKIII.
1,6 V RMS for full output
At all level settings from balanced and unbalanced sources: 40 kOhm
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 unique on- board safeguarding circuits that continuously survey all important parameters.