hello piet. it's been awhile since i've listened to any of the avalon line on levison (the company/not the man) gear. in my experience with avalon products (i've own one variety or another since 1989), they just don't sound their best with levinson amps, which tend to be bright, dark and too forward. maybe madrigal has improved the line, tho i've not heard that with other speaks; e.g. watts/puppys, big thiels, jm labs, etc. BTW, there's a HUGE difference between the avalon avatars and eidolons. the latter are MUCH more revealing of faults in the electronics/frontend(s). you can get by with substantially less power & refinement with the avatars. as to the 220 outlets: as far as i know, this is applicable only to the boulder amps, which are user- switchable from 110 to 220. most other amps are available only as "american," "european," or "asian" models that are factory-set to the electrical standards where they are sold or to be used. when the boulders are run into 220 outlets, they will not clip at any listenable spl. the "smaller" (read $36k or >) boulder amps will clip with relatively inefficient (<85 db; nominal 4 ohms or<) speaks driven @ "live rock" levels (my cuppa tea). but hey, if you got game to go $(USD) 100k or more, JUST FOR THE ELECTRONICS IN A TOP-OF-THE-LINE BOULDER STACK, then you can surely spring for another 220 outlet and matching wiring; if not, you're gonna need to put a differently-configured outlet into the box where ya usta plugin the clothes dryer.