>> 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.

No. The speakers are USB-powered, so no transformer.

(In fact, the device you plug into the USB port is actually an external 
sound card with built-in amplifier, and the [detechable] speakers 
themselves are passive.)

The speaker housings appear to be metal, which is unusual. (Mind you, 
they claim to be magnetically shielded...)

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

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