Generally, the way to get louder sound out of your iPad is to buy a music dock, which is a speaker and amplifier combination that typically costs around $100 or more.
But a clever plastic clip-on device called the Amplifiear (Get it? Amplifier? Amplify ear? iEar?) increases your iPad’s volume, if not its sound quality, for $25.
The device, available online, is essentially a modern megaphone. It increases the volume in the same way that cupping your hands around your mouth when you yell does. (A competing product from Matek is available online for $7, but I haven’t tried it).
The Amplifiear has a little more style then cupped hands. The ABS plastic device looks a bit like a single Mickey Mouse ear that latches over the edge of your iPad redirecting sound from the speaker on the back around to the front. It is available in the six colors matched to the Apple Smart Covers: blue, orange, green, red, white, black.
The company claims that the device can increase volume by 10 decibels. Using a hobbyist sound meter, I counted 6 decibels, which is still a significant difference.
While it increased the apparent volume level, it particularly seems to boost the higher end of the frequency range, meaning whatever sparse bass you were getting out of your iPad will be overwhelmed. The effect can be a bit harsh.