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Whenever I drive over speed bumps (or pot holes or whathaveyou) I notice that when the rear wheels go over, the whole car jumps up and down and clatters, a lot more so than the front wheels. I am pretty sure the shocks are not the issue here, partly because I've changed them and the behavior didn't go away and partly because the problem is not that the back is too bouncy, it's that it's too stiff. It almost seems like there's something wrong with the coil springs, but they look fine and I have no idea how to test them otherwise... Any ideas?

The car is an Acura Integra from '93, a sporty hatchback.

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what type of vehicle? most likely this is not something "wrong" with the vehicle, merely a consequence of suspension design, weight distribution, and physics. –  mac Oct 30 '13 at 20:46
    
@mac it might well be that there's nothing wrong, but how do I determine if that's the case or not? –  vlsd Oct 30 '13 at 21:01
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A fairly common issue on cars with strut suspension are broken springs. As the strut wears it looses its ability to control spring dampening. This allows the spring to compress and expand faster and farther than designed. Over time the spring weakens and breaks. The break many times occurs at the very last turns of the spring and may go unnoticed. Look at the very bottom of the spring and see if the end appears as a clean edge or a jagged break. You should have the same number of coils on both sides. The shortened spring acts stiffer than the stock spring resulting in a harsher ride. Another source of banging maybe worn or damaged strut mounts ( in your case this should have been detected during replacement). You may also have worn suspension bushings that are allowing extra movement resulting in the banging. Don't forget to rule out a broken exhaust hanger letting the exhaust bang on the floor.

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Mike nailed it: I would assume that any bushing or other rubber-based component on a 93 car is completely worn out. This includes the top mounts for the shocks, the bushing on the sway bars end links, the control arms, the exhaust hangers, etc. It's likely that if you crawl around under the car, you'll see a lot of worn out rubber bits. –  Bob Cross Oct 31 '13 at 11:59
    
I've changed a few bushings already while doing the shocks. Replacing all of them is, while feasible, a serious and expensive undertaking. Is there any way to prioritize? –  vlsd Oct 31 '13 at 17:27
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@vlsd depending on the bushing geometry, you may be able to put some load on the joint with a prybar or something and observe the way the bushing reacts. You may be able to tell which are most worn in this way. –  mac Nov 1 '13 at 14:28
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