Loud thud over bumps

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2007 MazdaSpeed3
Every time I go over a bump or dip in the road, there is this awful sound that comes from the right rear of my car. It sounds like a bowling ball is where my spare tire goes and every time a bump is hit, it makes a low, "thud" type sound. I don't know if its my shocks or not. When I push down on my car, I don't hear the noise and the car doesn't bounce as if there was a blown shock. I tried to record the noise but its too low for the mic to pick it up. I don't want to spend money on shocks if that's not the issue. Does anybody know what the problem could be or has anybody had this issue before? Thanks guys.
 
My money is in the rear strut mount! I have the EXACT issue last week! strut popped thru the mount on me...

F138775C-1481-440B-B856-32749CB50760-1129-000001340BFED695.jpg
 
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My money is in the rear strut mount! I have the EXACT issue last week! strut popped thru the mount on me...

F138775C-1481-440B-B856-32749CB50760-1129-000001340BFED695.jpg

3's have a separate shock and spring in the rear unlike the strut shown here in the pic. This is probably from a pro5 I'm assuming... completely different. Your "clunk" or "thump" may be related to the swaybar. The bushings are known to wear and make noise, that was problem with mine.
 
I must agree with the swaybar answer.....I had some pretty nasty noises coming from my stocker before I replaced it with a Progress sway bar. Now I've only got a few squeaks in the wintertime to attend to.
 
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