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How about acoustic-suspension loudspeakers?

17 lbs i think. real simple design too it didn't look like your picture but it's a real popular design. here the test we had two box of plastic straws and 50 pins and had to build whatever we wanted. so i offered the idea to make it real wide and have a arch designated just for the center of the bridge which we agreed upon and built one of the first, think it was a record for the highschool class of 60, probably 20 or 30 in this physics class. it's almost like the other teams didn't think about how to maximize the potential of the bridge-building and went for design and art rather than practicle designs. i have a feeling we were one of the teams who pulled it straight from our classroom book but modified it a bit to each of our liking, it was an ugly ****er but we won no special prize or nothing.