Looks like a driver is definitely needed at least.

Take a look at this [XDA post][1] and this [Acer Tablet Forum post][2].


  [1]: http://forum.xda-developers.com/showthread.php?t=1145394
  [2]: http://www.acertabletforum.com/forum/acer-iconia-tab-accessories/693-usb-headset-compatibility.html