I agree about moving the rattles to the front when using a front-sub, but most people (including us) already strip the front-end of the car completely to dampen the doors and floor, customize the dashboard to house mids and tweeters, wiring up the headunit and all speakers...
So it's not that hard to add a few braces and some extra dampening while everything is apart...
If you can decrease the rattling coming from the back, you might end up not having to dampen/brace/... the rear part of the passenger-compartment of the car and saving work hours in the end...
It all depends on the car, install and skills. In a Saab 900classic, it's ''easy'' to customize the center console to house a pair of 8'' subwoofers and that's the only reason why we even thought about doing it...
Isabelle
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