“What is the purpose of the Polk X-Port Technology with an Eigentone Filter (ETF) in the R400?”
This question was generated by AI based on customer and product data.
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The Polk X-Port Technology with an Eigentone Filter (ETF) eliminates port and cabinet resonances in the upper bass and mid-range, resulting in smooth and detailed audio.
This answer was generated by AI based on customer and product data.