> I was thinking more that being heavy allows the speakers to generate low 
> frequencies more easily. (Otherwise the driver might end up just wiggling 
> the cone one way and the casing the other way, and not producing much 
> sound.)

Yes, the cabinet should be as stiff as possible (unless you have designed 
some uber leet flexible cabinet that does very clever stuff).  But the 
weight you are feeling is probably just the magnet and coil inside the 
speaker driver.  Do the speakers also contain a PSU and amp?  That would 
also add significantly to the weight of PC speakers.

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