If you want to watch videos on your iPad or other tablet from afar, without headphones, its built-in speaker is pretty worthless. This trick can boost the sound significantly with almost no work at all.
We've shared a bunch of ways to do this in the past — from sticky notes to blocks of wood to drilling holes in the tablet itself — but this is one of the best methods we've seen yet. All you need is a plastic cup and some scissors. Cut a hole in the end big enough for your tablet to fit in, and press play. You should find that the sound is significantly louder. Obviously, this won't boost the sound quality in any way — so music listening still won't be great — but for listening to podcasts or watching TV, it's a very clever solution.
iPad Amp [Reddit]