If you can, try different file formats and cleaning away anything from the speaker. If that doesn't work, have you tried it with headphones? If the problem is still there you probably do need a new phone or a repair.
Posted from my CrackBerry at wapforums.crackberry.com
I currently use the 8830 as well and when i first got it, i would constantly miss calls, emails because the volume was to low and was distorted. I updated my software about a month ago to 4.5. now the ringer is so loud i had to turn it down. try updating your software, and i think this will solve your problem.
