Another use for computer speakers is amplified speakers for an MP3 player. Just plug the speakers into your MP3 player and you’re ready to listen to music without headphones.
My cell phone has a 3.5 mm audio jack. When it’s plugged into speakers it can be used as a speaker phone or listen to a podcast. The phone’s built-in anti-echo circuit does a great job of eliminating feedback. If your cell phone doesn’t have a mini jack you can probably obtain an adapter cable.