The center channel speaker is the workhorse in any home theater speaker system — it's assigned the task of reproducing all the dialogue and on-screen special effects. The CSi5 is definitely up for the challenge. Featuring advanced Polk technology and design, the CSi5 uses the latest-generation Dynamic Balance® drivers — a 1" silk/polymer dome tweeter and dual 6-1/2" woofers — for clean, rich sound. The rear-panel Power Port offers deep, high-impact bass, and the front-panel ARC (Acoustic Resonance Control) port delivers clear, natural midrange performance, essential for reproducing the human voice.