Compact Metal Speaker Delivers Big Sound “Aluminum tube. Planners and creative designers are raving about this tiny little music maker that can be placed anywhere and be virtually hidden from the site. It sounds just like a full-size speaker and gets surprisingly loud. All this from an aluminum tube the size of a toilet paper tube. Perhaps the “bigger is better” days for speakers are finally going away. It has a built-in MP3 player and rechargeable battery to play music without a connection. It can be attached to anything and last for hours. Now, we program different sounds for different vignettes and have a wide array of music and moods in one event for next to nothing—a little investment and a HUGE idea.