Previous iMacs featured a dual-mic setup, with two microphones hiding behind the front-facing camera. Two microphones allows the device to filter out ambient noise and produce a cleaner signal.

This year, it seems Apple switched to a single microphone—and moved it to the bottom of the display, behind the glass.

Perhaps they've improved their signal processing enough to make do with one and save some pennies.

We'll wait to hear from the early adopters if the new setup is any better or worse.