Hi Max65.
I would say the best amp of the three you mentioned for the Sonus Faber Elipsa Red is the Spectral DMA250 being BJT (bi-polar)output it can almost double it's wattage for each halving of load impedance all the way down to 2ohms, and that means it can do current better than the other two which are Mosfet and cannot do the doubling act like the Spectral can.
Your Sonus Faber Elipsa Red are magnificent speakers but are a pig of a load in the bass region and demand an amp that do current, even though they are 91db efficient.
Quote from Stereophile:
"Though this is slightly lower than the specified 91dB, the shortfall is not important. While it will therefore require less of a voltage swing to play loud, the speaker is still a demanding load for the partnering amplifier, with an impedance magnitude that drops to 2.5 ohms throughout the upper bass (fig.1). There is also a punishing combination of 4 ohms magnitude and –50 ° electrical phase angle at 70Hz that will suck gobs of current from the amplifier."
And that -50% phase angle could mean a load down to even 1ohm at 70hz.
Cheers George
