Sonus faber Extremas are inneficient and very difficult to drive because they used series crossovers with no caps, only inductors. The bass inductor dissipates so much power that it has its own heatsink at the back of the speaker enclosure.
You need muscle amps to push them. IMO no tube amps should apply, except for ARC's and McIntosh's top models using the 2 ohm output tap.
Look for an amp that will consistently deliver 200 W into 4 ohms or less. They should mate very well with Gamut D200 or McIntosh MC402 amps.
Here is the original factory blurb:
A "high technology" speaker, Extrema was designed with the aim of handling high dynamics with the lowest possible distortion. It is the first speaker without capacitors in series with the signal (sine cap). It cannot be purchased without commitment because it demands absolute excellence in both the partnering electronics and the installation. The need to calibrate this speaker is paramount if its talents are to be exploited. The cables used must harmonize with the various elements of the system: source, amplification, speakers and environment. .....
BTW Sonus Faber's current speakers are much easier to drive.
Good luck
You need muscle amps to push them. IMO no tube amps should apply, except for ARC's and McIntosh's top models using the 2 ohm output tap.
Look for an amp that will consistently deliver 200 W into 4 ohms or less. They should mate very well with Gamut D200 or McIntosh MC402 amps.
Here is the original factory blurb:
A "high technology" speaker, Extrema was designed with the aim of handling high dynamics with the lowest possible distortion. It is the first speaker without capacitors in series with the signal (sine cap). It cannot be purchased without commitment because it demands absolute excellence in both the partnering electronics and the installation. The need to calibrate this speaker is paramount if its talents are to be exploited. The cables used must harmonize with the various elements of the system: source, amplification, speakers and environment. .....
BTW Sonus Faber's current speakers are much easier to drive.
Good luck