There have been rumors that it is a bug, and that HTC are trying to fix it. However, I do also believe that the DHD was not designed or made to be a phone with a good loudspeaker. Have you seen how small the speaker hole is? I don't think we can expect much more noise from it

. It's more meant to be a portable media player, where users are meant to plug in headphones. As for the headphone volume and quality I am more than pleased with the DHD