JBL Studio 520CBK 2-Way Dual 4-Inch Center Channel Speaker Dual 4-Inch (130mm) Transducers with PolyPlas cones 1-Inch (25mm) High-Frequency Compression Driver Glass-filled ABS Bi-Radial High-Frequency Horn 3/4-Inch (19mm) ultra-ridged MDF Enclosure Exclusive Design