Why are the speakers on my HTC One so quiet?

I just got a new HTC One , and while it is brilliant, the speaker volume is awful. Headphones sound really good, but even with the media volume all the way up, the speakers are too quiet. This means that I often miss navigation directions, etc. Is there a hidden speaker volume? Ideally, I do not want to install a custom ROM or root my phone, but any suggestions would be useful.