Polk Audio's RTi A Series uses MDF wood in construction in order to provide sound aesthetics. The RTi A5 is a single, floorstanding speaker which retails as one individual unit. It features dual 6.5-inch dynamic balance mineral/polymer composite cone drivers and a 1-inch silk/polymer composite dome tweeter. The Acoustic Resonance Control (ARC port) allows for clear, natural sounding midrange and combines with Polk's Power Port technology for a clear, punchy bass signal as well. The RTi A5 has a heat sink located behind a neodynium magnet as well as low viscosity ferro-fluid cooling and maintains a frequency response between 30 Hz-27kHz.