Many folks told me not to use tube amps with Sonus Faber Serafinos as the speakers are already warm sounding. Also I was wondering if anyone have tried vintage Marantz or Pioneer receivers with these speakers. I heard Marantz 2270 at my friends place with regular polk speakers and it can distroy many best in class amp/preamp combos. But not sure if they will have enough power to drive Serafinos?