Not surprised that high efficiency speakers are top of the list of suggestions but there's more than one way to skin that cat(love being non-PC).
For speakers, you can divide the question into 3 parts; transients, bass slam and SPL (volume). The latter being more associated to allowable distortion. Oversimplified, often it is "bigger is better".
For speakers, you can divide the question into 3 parts; transients, bass slam and SPL (volume). The latter being more associated to allowable distortion. Oversimplified, often it is "bigger is better".