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The determining factor is if your speakers are magnetically shielded. I know my JBL creature II's are magnetically shielded. I looked at the link you posted for yours and i couldn't find any info on it. For a fact i know the logitech z5500's satellite speakers are magnetically shield but the sub is not.

Hope this helps

Edit: After googling around i've determined the sub is not shielded (one source) so as long as you dont put your hdd by you sub you should be fine with your drives
 
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