Omega makes some fairly high efficiency small speakers (genuine 8 ohm load, efficiency in the lower to mid 90's) using modified Fostex and other fullrange drivers. You trade off bass extension and high power handling capacity.
D. Edwards is right - the inevitable tradeoff of efficiency vs bandwidth means that a small speaker can't give you deep bass and high efficiency at the same time. Whether the Omegas can give you "enough" bass depends on what you're looking for and how much boundary reinforcement the speaker gets. Of course bring a subwoofer into the picture and lack of bass is no longer an issue.
Duke
D. Edwards is right - the inevitable tradeoff of efficiency vs bandwidth means that a small speaker can't give you deep bass and high efficiency at the same time. Whether the Omegas can give you "enough" bass depends on what you're looking for and how much boundary reinforcement the speaker gets. Of course bring a subwoofer into the picture and lack of bass is no longer an issue.
Duke