Don't give up sub strengths for size - I'm unsure what sub you have, but this 50W entry-level offering from Polk - a lot of distortion past 50 Hz, lot of port chuffing - might not be a worthy change, not sure if u can call it an "upgrade." If size is a concern, the Polk PSW111 is a great choice that is better than the PSW10, albeit at a bigger cost.
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