I haven't heard the Rocket speakers. However, pick the 550 for example as it could be a good comparison to the Polk RTi8 speakers. The 550 is supposed to be a bit more forward sounding than the 750s. However, the Polk RTi8 speakers have a very forward presence and don't provide adequate bass, IMO.
Don't get me wrong, the fit and finish on the RTi8s are very good. However, after owning them for a bit over 6 months, I realized that I needed to move onto other speakers.
RTi8's are excellent speakers and have two midrange drivers. Thats why they lack in deep bass. A sub is a must with them. The mids however are top notch and they use vifa tweeters. I have a 20x18 room and have measured in room response. They were down -3db at 35hz and rolled off pretty sharply from there. I would think a sub would be required with the Onix Rockets too.
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