There is no reason to even bring up the fact that the iPhone’s internal speaker system sucks, but I just did. So the best solution to a terrible sound is boosting it with something else.
The Anker A7908 Portable Bluetooth Speaker is a box speaker that fits in the palm of your hand, but packs a punch when it comes to increasing the volume of your iPhone 6. The nearly 20-hour battery life makes it possible for you to keep the party going, all night long.