This performance and engineering marvel amazes in every respect.
It optimally represents FM ACOUSTICS' philosophy of avoiding any unnecessary bulk and weight and instead concentrate all efforts on superior performance.
While its size is diminutive indeed, its performance is the opposite; this gem of an inherently musical amplifier is quite the contrary of the typical bulky and brash-sounding „overstatement“ power amps.
...and the proprietary safeguarding systems of the larger Resolution Series are employed. The same „zero compromise“ philosophy is evident and use of many identical components guarantees absolute
It is hand-crafted in Switzerland by the same craftsmen and craftswomen who create the renown large FM ACOUSTICS amplifiers that are used as reference by leading artists and studios the world over.
Technical excellence is evident:
instead of a switched power supply - which would be small and very cheap but with the huge disadvantage of inherent current limiting - the FM 108 employs a unique high-power linear ‘analogue’ supply. It is therefore completely self-contained and free from the disadvantages of digital power supplies.
Its balanced symmetrical input recognizes what type of circuitry the preceding pre-amplifier is using and automatically optimizes and balances the audio signal right at the input.
The FM 108 is the preferred choice when ultimate audio signal fidelity, dynamic accuracy and neutrality, in short, when Resolution Series performance is required.
The FM 108 can be placed next to a speaker or in any remote location. Even when power is switched on remotely the FM 108 keeps all features such as delayed turn-on, all safeguarding intelligence etc.
No long warm up time is required: within ten seconds from switch on it is fully operational and never sounds harsh or bright.
The FM 108 is the power base for a discrete high performance music or AV system that will enthral the most discerning listener. It outperforms other units costing up to six times the price (and which "feature" up to fourteen times the bulk and weight)!
The FM 108 is a dream come true for thousands who already own an FM 122, FM 133 and/or FM 155 and for those who desire an unobtrusive, musically accurate single channel power amplifier of Resolution Series quality.
With a total weight of 4.5kg (yes, 10 pounds...) and a size of 24 x 30 x 6cm the following outstanding data are achieved:
Minimum Power Output:
140 W peak into 8 Ohms
260 W peak into 4 Ohms
400 W peak into 2 Ohms
70 W RMS into 8 Ohms
130 W RMS into 4 Ohms
200 W RMS into 2 Ohms
Max. Output Voltage: 66 V pp.
Max. Output Current:
Unlimited repetitive peak output current. More than 15 A continuous. 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:
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).
Rise Time at Full Power: 3 uS
Hum and Noise:
Minimal unweighted (20Hz-20kHz) :
better than -100 dB
Electronically balanced discrete class A circuitry, floating ground, non-inverting or inverting mode. Optimal performance with either balanced or unbalanced (single-ended) sources.
Single ended sources are automatically balanced right at the input of the FM 108.
0.9V RMS for full output
At all level settings from balanced and unbalanced sources: 40 kOhm
Input Stage Common Mode Rejection:
90 dB typically, better than 80 dB at 50 Hz, even better at other frequencies.
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.