cshadow
Amp for kef reference 1
These are 80-85db efficient, so a good 120- to 300w @ 8ohms will do, and they are a quite easy load around 4ohms with very low -phase angle.
https://www.soundstagenetwork.com/images/stories/loudspeakermeasurements/kef_reference_1/impedance.g...
https://www.soundstagenetwork.com/images/stories/loudspeakermeasurements/kef_reference_1/electrical_...
They are flagship model and deserve a flagship amp, if I owned them and had the funds I look at a high class-A bias class-A/B amp to get the sweetness, these Class-A/B Gryphon Diablo’s would be nice the 120 or if you have the extra the 300
https://gryphon-audio.dk/shop/integrated-amplifiers/diablo-120/
https://gryphon-audio.dk/shop/integrated-amplifiers/gryphon-diablo-300-integrated-amplifier/
BTW MF amps to me have always been a bit too surgical sounding, and they have lot of gain usually which brings up the noise floor, Antony Michaelson seems to love gain, not a good match for these Kefs, to be a relaxing listen.
Cheers George