I own a pair. I suppose it depends on a number of factors. I drive them with a Boulder 1060 connected with NBS Omega 1 speaker cables. I run my Wadia 861 straight into the amp via Tara Labs 0.8 balanced interconnects. I wouldn't consider my system warm, but it has tremendous detail. The Alto Utopia BEs are phenominal loudspeakers. I've tried many cabling combinations, but this setup gives me I want. I like them so much that I'm considering moving up to the Novas because I have the room and like what the Utopia BE series offer and want to go to the next level.