Speakers are easy for companies to sell, but hard to properly design. That?s the nutshell version of the lesson we?ve learned after testing hundreds of different iPod speaker systems, most recently including Zagg?s RockStic ($70), an interesting new offering from the maker of InvisibleShield film protectors. Like many other first-time speaker vendors, Zagg came up with an iPod-ready all-in-one design that has a unique feature or?

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