Topic: Mics and Headsets for Ventrilo
Looking for a headset? The sound input jack on your Mac is not a microphone input jack, even though it's the same size. You must use your Mac's built-in Mic (with headphones) or a USB headset (or possibly a bluetooth headset, but I have no experience with that).
If you use the built-in mic, don't use external speakers, otherwise others will hear an echo (their own voices played through your speakers and then captured by your mic!). Instead, use headphones or earbuds.