polk audio csi a6 black center channel loudspeaker csia6bk
polk audio csi a6 black center channel loudspeaker csia6bk dual 6-1/2 ' mid/woofers 1 ' silk/polymer dome tweeter dual rear powerport bass venting magnetic shielding mylar bypass capacitors acoustic resonance control ( arc port ) technology dual bi-ampable gold-plated 5-way binding post inputs butyl rubber surrounds floating anti-diffraction grilles all-mdf construction black finish sold as a single