CV are in front and back, there are 8 CV's on the car (2 on each axle).
The noise is often either the wheel bearing or CV.
Rear wheel bearings often make a "whomp whomp whomp" type noise when failing, but if they get bad enough that theres play in the bearing they can sound more like a clunk/click like you would expect from a CV.
Subarus do tend to have a greater than average failure rate on the wheel bearings, so when theres a noise at one of the wheels I generally look at the bearing first.
04xt/4eat, 16g, STI bits and bobs