Is there something you dislike about the sound without mass loading? There's no reason you have to add mass to the speakers unless you're worried about them tipping or you feel the bass is over-pronounced (i.e. "boomy"). Another thing to consider is whether or not you might ship the speakers in the future (like if you decide to sell them). Adding material such as lead shot can potentially damage the finish if you're not careful. And materials like sand are a real PITA to get out prior to shipping.
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