Not sure will this help, but still...friend of mine had Extremas, he used to run them with Krell Fbp 300cx for years, only to replaced them with Amati Futura. In that period he got ML 332 which he completely refresh and said that he prefered Krell. Speaker cables were Audioquest Sterling.
Used to have SF Guarneri Homage, of all amps that I had or tried, Krell Evo 302 was best on it