As always, Polk has paid close attention to the details. The RTi4's cabinet features all-MDF construction with extensive internal bracings that virtually eliminate sound-muddying resonance. It also includes Polk's exclusive Power Port technology for clear, deep lows, and an ARC (Acoustic Resonance Control) port for more natural mids. Dual gold-plated 5-way binding posts allow for bi-amping or bi-wiring.
The RTi4s do a great job with stereo music on their own, or you can team them with a powered sub for rib-rattling results. For dynamic, detailed movie sound, use 2 pairs as your home theater's front and surround speakers. For larger rooms, the RTi4s work perfectly as surrounds in combination with RTi tower front speakers.
Recommended center channel speaker: Polk CSi3.
Recommended surround speakers: Polk RTi4.