I think that so long as you are not running them loud for long periods of time you should be fine. My original set of 5.1s are like this and still are going fine after 6 years now although with only occasional use.
I have read about on the internets that some people have modded their 5.1 setups to include things like cooling fans to help dissapate the heat produced by the amps, and that they claim this will improve the longevity of the sub. I don't know if they work or how badly they mess up the sound as a result of putting fans, etc in the sub. However on my 5.1 sub the metal backplate I am guessing is doing a lot of the dissipation- could one not simply bolt a large heatsink to that metal plate to improve the heat dissipation of the unit? This would help at least some with heat, and not be too intrusive of the sub in the process.
Ruahrc
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