Don't knock this! At one point, it's all we had! When you walked down the Residence Hall way back in college, you could tell the budding serious audiophiles from the rest of the crowd if they had tennis balls under their bookshelf speakers! This was a somewhat useful treatment that worked nicely and was cheap! The only thing missing here is that it was often better to add a few vertical slits to the equator of the tennis ball which helped lower the Q of the overall damping as needed. (Predictability however was nil so it was a compete trial and error experience. Still it was quite useful in many cases. Led Zeppelin and walls of cinder block in a small dorm room was not a great recipe for good sound!)

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