the main difference is not the sub but tweeters. logitech has not used tweeters as far as i know. klipsch uses horn-loaded tweeters which are very effective but can also be kinda bright. if you are after bump/sizzle from your speakers go for the logitechs. they have better overall sound if your music is R&B, rap or lower frequency music. if you listen to like jazz or stuff that requirees more finess in the upper range get the klipschs. either way i would still pick the klipsch speakers because they are made by a very reputable speaker maker. logitech makes mice and joysticks.