Loop pedal question

I'm looking into buying a loop pedal, perhaps this one (link below).
But I don't have an amp. I was looking to use some computer speakers
I have that use a regular headphone jack. My question is, I have an
acoustic-electric, so if I plug a cable into the guitar and then into
the pedal, can I buy some kind of jack plug connector that will allow
me to use the computer speakers (since the jack that goes into the
pedal is bigger than the smaller headphone jack).

http://www.musiciansfriend.com/product/Boss-RC2-Loop-Station-Stomp-Box?sku=487040

Is this a good pedal by the way? Any other suggestions?

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