The "MK-II" version of the FM 255 provides an ideal combination of true symmetrical and single-ended signal handling with an unbeatable price/performance ratio. The FM 255 has rapidly become the
most successful pre-amplifier/line stage.
Designed and crafted the original FM ACOUSTICS way the original FM 255 never required updating since its inauguration in 1995.
With the advent of new circuitry pioneered in the FM 266-MKII and FM 268 C and with the availability of new parts, a new standard has become possible. Keeping the time honored design of the original FM 255 the refinements manifest themselves in more substantial improvements.
The FM 255-MKII-R
is identical but features a nice remote that allows the important functions to be controlled remotely.
Handcrafted at FM ACOUSTIC'S Swiss facility it provides an additional great feature that is unique:
slow and fast speed volume control.
- The upper two controls "FAST" will cause the level to increase or decrease rapidly.
- The lower two controls "SLOW" will cause a more gradual change of level, thereby allowing very precise audio level setting.
New switchable true-impedance attenuators - unique to FM ACOUSTICS - are included on the balanced inputs. These are very useful with some of today's high level components (Download
servers/CD/DVD players/converters etc.) that deliver excessive voltages - often far above the standardized level ratings. Such excessive input levels can overload input stages (not the ones
of the FM 255 though...). They force the user to set the Level control on the line stage to very low settings, so low that it actually works as an attenuator instead of a pre-amplifier.
The new input attenuators lower such excessive levels whilst guaranteeing perfect balancing (not an easy feat). This in turn results in optimal Level control setting (around 12 o'clock position for normal listening levels).
To allow optimization of the total system gain - which differs widely from one system to another - further level switches allow tuning of the internal gain of the FM 255-MKII. This allows more flexibility in system gain optimization.
Any system can be set to an optimal gain structure - which improves total system performance.
The new "HR" modules are used on the inputs. They help to achieve an astounding 100dB of rejection of interference, hum, noise etc.) making the FM 255-MKII immune against disturbances.
This rejection is not achieved with cheap op amps but with a fine-tuned discrete Class A configuration which guarantees the phenomenal resolution FM ACOUSTICS equipment is world renown for.
The new "HR" type 19200 modules are employed for the true balanced outputs. These new "HR" modules are the result of a multi-year development.
They achieve a superb level of reproduction and reliability. Never before has such a level of accuracy been achieved.
To avoid negative influence from spurious resonance and guarantee positive connection the FM 255-MKII employs FM ACOUSTICS' unique resonance-eliminator supports.
These isolate the unit from potential resonances which are absorbed.
Hand-selected precision Output Level and Balance controls in combination with proprietary interference rejection and singular shielding/grounding techniques achieve the highest level of musical accuracy.