i play the kestral 2's with 60 wpc push pull. the k2's are apparently more efficient than the originals.. are you sure of sensitivity value.? if so, the obvious ? is how loud do you need them to play? do you have a decibel meter, if so just do the math. if it is truly 86db i doubt you will really get them singing the way you should but it depends on the source, room, etc. honestly i don't think 86 db. speakers are a decent choice for low powered amp even if it is the SET type. of course if you bought some hi $$$ SET you may pull it off but at that point you might as well get more eff. spkrs. interesting question tho!
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