Pinnacle Speakers 5.25" Series II 3-Element, 2-Way Reference Center Channel Speaker, Black (BD 300 SERIES II) 1 liquid-cooled silk dome tweeter with Neodymium Magnet Two 5.25 polymer cone woofers with rubber surrounds Freq range at -6Db low: 59hz, high: 27Khz Freq resp: 69hz-23khz (3Db) Sensitivity: 87Db at 1W/1m (2.83V pink noise)