Not sure if this will help but when I bought my 8830, I was disappointed with the volume too. After playing around with it, I found a way to increase the volume.
Most of you may know how to do this and maybe you have and the volume is still low but for the ones that have not tried it, do this:
From the main menu, go into "profiles" (speaker icon), in profiles, scroll down to "Advanced". Now in here you can create another profile or edit an existing one, I edited the "Normal" one. Highlight the Normal one, press the menu button (button right next to the green phone) and select "Edit". After clicking on edit you'll see another menu come up. Scroll down to "phone" and select it. You will then see all the options you can change for the phone. Set the Volume to High and I found the "Ringer_BBpro_1" ringer to be loud. make sure you change the option for "In holster" also right below. You can also change all the notifications such as SMS Text, Messenger, etc once your done with the phone.
Again, this is my first time owning a blackberry so if everyone knows about this menu, then feel free to ignore this post
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