Klipsch RB-35 Bookshelf Loudspeaker Frequency Response - 45Hz to 20kHz +/- 3dB Sensitivity - 96dB @ 2.83 volts/1 meter Nominal Impedance - 8 ohms compatible Enclosure Type - Bass reflex via front-mounted port Tweeter - K-130-DN 1 (2.54cm) Titanium dome compression driver