... its not enough power on speakers like that unless the intention is to have the music mostly in background or serious listening at lower levels.
I would add to Ralph's comment that the dynamic range of the kinds of recordings that are listened to (i.e., the **difference** in volume between the loudest notes and the softest notes) will dramatically affect how much power is required. For example, many well engineered minimally compressed classical symphonic recordings require **many** thousands of times as much power to reproduce brief dynamic peaks as to reproduce their softest notes. While many and probably most pop and rock recordings are dynamically compressed such that they require no more than around ten times as much power to do likewise.
Regards,
-- Al