Quoting from this Epos Product Archive Paper,
We recommended that the M16i should be partnered with an amplifier that is capable of driving a four Ohm load to high levels.and
Amplifier Compatibility! 50 Â 200 Watts.Your speaker may perform well with tubes, but not a 15 watt SET. The Cary should be used with speakers that have a sensitivity in the 98db range.