You may have a misunderstanding about speaker size. Generally it's the smaller ones that are harder on an amp, i.e. less efficient/less sensitive. Hoffman's Iron Law of speaker building to an extent. Generally larger speakers are easier for amplification in that they are more efficient and more sensitive. In any case those Klipsch are fairly small speakers with limited capabilities overall, hopefully you will use a sub with them at least....can only get so much from a 4" midwoofer like they have. Keep in mind also Klipsch uses a somewhat different sensitivity rating, theirs is an "in-room" type deal where it's generally stated 4-5dB higher than typical measurements (anechoic).