thiel 3.6's present a difficult load to an amp - yer amp better output lotsa current! that said, i don't think 3.6's wood be any *more* difficult a load than the 3.5. the 3.5, w/its active equalizer, has a rise of some 20db at 20hz - a *wery* difficult challange for an amp.
while an adcom amp may not be the best match for the 3.6, it's prolly not the best match for the 3.5 either. so, if yure satisfied w/it driving yer 3.5's, i'd at least try it w/the 3.6's prior to getting a gnu amp. ewe may be pleasantly surprised, and the upgrade disease that aflicts us all, may be successfully held at bay - at least for a few days! :>)
i used to drive a pair of 3.5's w/an adcom gfa555, w/satisfactory results. changing over to an electrocompaniet amp, even tho about half the wattage rating, drove the thiels even *better*, prolly cuz the current output is about 4 times that of the adcom. also, imho, electro amps are as good as it gets in solid-state. ok, shameles plug time! ;~) i presently have an electrocompaniet aw100 adwertised f/s here on a-gon for a measley $800 - w/100wpc/190 into 4 ohms, >80 amps current output, i *know* this will work well w/thiels! :>) i *upgraded* to a matched pair of electro amps, so i could wertically bi-amp my present speakers...
doug s.