NHT SuperZero Bookshelf Speaker (Single) (Discontinued by Manufacturer) 2-way, 2-liter acoustic-suspension design, video shielded 4.5-inch long-throw woofer with 1-inch, fluid-cooled soft-dome tweeter 5-way binding-post terminals 85 to 25,000 Hz frequency response (+/- 3 dB) High-gloss, black laminate finish