Here is a cool case that serves as an amplifier for your iPad. Ampple is designed for the iPad Air 2, iPad Mini 4, and 9.7″ iPad Pro. It has a lightweight design and can increase the volume over 3x.
Ampple has a HD sound system inside lasting up to 10 hours, as long as your iPad lasts. It connects to your tablet via Bluetooth. The case will be available in multiple colors. The product is expected to ship in December.