I am looking at setting up a speaker system on a bicycle trailer with a solar panel on top, a deep cycle battery, a class T amp, and a couple of efficient speakers. I know what to get for everything except for the efficient speakers. The reason that they need to be efficient is because of the low wattage of the class T amp. I don't need really good quality since after all this is just going to be a portable audio system that I can bicycle around. I just need to be able to put out some tunes. Any suggestions for relatively good, efficient, and cheap speakers (I am a college student so sub $200 for a pair)?