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 fom site. It sounds just like a full size speaker and gets surprisingly loud. All this from an aluminum tube the size of a tube of toilet paper. Perhaps the days of "bigger is better" for speakers are finally going away? It even has a built-in mp3 player and rechargeable battery, so it can play music without being connected to anything. It can be attached to anything and last for hours. Now program different sounds for different vignettes, have a wide array of music and moods in one event for next to nothing. Little investment HUGE idea.