My experience differs from Meiwan`s, a high quality low powered amp will more often then not sound much better at low and normal volume levels. Better in terms of resolution, inner detail,microdynamics,nuance and natural tone. I do agree that for inefficient, high current demanding speakers, high power amp are mandatory. A high efficiency/easy load designed speaker sounds superior with upper tier low power amplifiers. This type of pairing is very dynamic and IMO more natural and real/live in it`s presentation.
