You are correct the 2.5's are very power hungry. I drove mine with an Acurus A150 for quite a few years. A couple of years ago bought a McCormack 0.5 Deluxe and WOW what a difference. Didn't realize the 2.5 were that good. Still have them in my bedroom where they work awesome. Save your money and spring for a used Aragon (4004 or 8002) or McCormack DNA 0.5 you will hear them like you have never heard them before. By the way the 2.5's really taxed the Acurus as good as it is, just not right for the demands of the NHT.
As a side note if you've noticed the looking down into the soundstage (I call it the balcony perspective) with the 2.5's, lift those puppies up off the floor about 8 to 12 inches, you will be rewarded.
As a side note if you've noticed the looking down into the soundstage (I call it the balcony perspective) with the 2.5's, lift those puppies up off the floor about 8 to 12 inches, you will be rewarded.