While no one is likely to use it for any critical music listening, the iPad’s built-in speaker is perfectly serviceable for watching video. Sometimes, however, you might find yourself in need of a little more volume than it can provide—but if you have a cup, you have a solution. Simply cut a hole in the closed end of the cup large enough for the iPad to fit through, insert the iPad with the speaker aiming towards the rear of the cup, and…
