Polk Audio RM7 Satellite Speaker (Single, Black) Single-packed satellite loudspeaker for front or surround channels in RM 2008 Series systems Equipped with a 2.5-inch midrange and a 0.5-inch tweeter Frequency response: 120Hz-22kHz Magnetically shielded for safe placement next to today's state-of-the-art TVs and monitors Accessories include flexible wall brackets