[ghp]

Just noticed this today- on all road surfaces a faint thumping type noise that seemed to come from the front part of the car. Did not matter if I was on the throttle or not almost mimicked a flat spot on a tire. 16 Outback 2.5 limited 10k. Suspension? Tire?

 

[Wilko1]

Check your tyres (Aussie spelling) for rocks in the tread or a screw stuck in there. If you do find a screw don't pull it out. Take it to a tyre shop.

 

[GeneT]

Agree with tires to check first. Sounds like a blister. Kind of rare with modern tires but - Hit any curbs or potholes lately?