Niles HDFX Speakers 5-1/4" Injection-molded TCC (talc, Carbon, And Ceramic-filled) Polypropylene Woofer Offers Extreme Rigidity To Reduce Breakup And Lower Distortion Long-throw Voice Coil/magnet Structure Increases Cone Excursion To Enhance Low Frequency Response And Dynamic Impact Dual 2-1/4" Injection-molded TCC (talc, Carbon, And Ceramic-filled) Polypropylene Full-range Drivers Fire To Either Side Providing A Uniform, Sound Field That Is Ideal For Special Effects 1" Teteron Dome Tweeter Is Fluid Cooled And Delivers Ultra-wide Dispersion To Reproduce Clear And Detailed High Frequencies Baffle-mounted Dipole/Bipole Switch Adjusts Surround Effects For Either Side Or Rear Placement