Join Date: Oct 2010
Location: Pacific North West
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I use them in different rooms for different things, but for a bigger room the Polk would be better, mainly because you would want larger front speakers. The z-2300 can get loud (i have never turned them past halfway) but it is nice to have a larger pair of bookshelf speakers for good sound production.
If you already have an amp and the Sony's are nice I would not replace them with the z-2300.
In short, I cant really compare the subwoofers, but the Polk is probably "best" unless you are limited in the size of your front speakers (like I am on my desk).