The answer is very common: " It depends. " An inefficient speaker with a low impedance is not going to work very well with a 2W SET amp. Thats a fact. Paired properly, an amp/ speaker combo CAN sound wonderful with just a few watts. It all comes down to proper matching.... There is certainly a need for power in many applications.
Why do speakers improve with more powerful amps?
So, if I have a solid state amp that more than adequately powers a speaker, why do people recommend a larger more powerful amplifier to improve things?
Why do more powerful amplifiers impact speaker sound quality in a favorable way? Is it because more power is reaching the speakers? Mid and Tweeter drivers I was told receive a reduced signal versus bass drivers which receive relatively more power via crossovers. All for the purpose of balancing a signal going to the various drivers.