Polk Audio LSiC High-Definition Center-Channel Speaker (Single, Black) The ultra-high performance Ring Radiator Tweeter is found on ultra-high end, luxury-priced speakers.As a result, the LSi Series sounds like a Polk Audio loudspeaker should: realistic, transparent, wide and embracing, with no distortion even at lifelike volume levels. This advanced crossover configuration works with the multi-driver array to deliver wider dispersion and greater midrange accuracy. Real Wood Veneer Panels: These solid, non-resonant, 1.5"-thick heavy duty panels reinforce the enclosure's solid quality, helping it remain totally and more efficiently acoustically inert. Gold-Plated 5-Way Binding Post Connectors: Dual (bi-ampable) gold-plated 5-way professional binding post connectors give you maximum signal transfer and the most secure professional connections. Dual ARC Ports: Acoustic Resonance Control. The ARC Port is a separate port coupled to the bass port and tuned to supress the internal cabinet resonances that can interfere with high performance audio reproduction. You will hear clear, resonance-free midrange and more accurate vocal reproduction