JBL Studio 530 2-Way 5.25-Inch Bookshelf 5.25-Inch (130mm) Low-Frequency Transducers with PolyPlas cone 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