Russound RSA-635 2-Way In-Ceiling/In-Wall High Resolution Speaker with 6.5-Inch Angled Woofer and Edgeless Grille (Black) Nominal impedance: 8 ohm 3/4" Ferrofluid-cooled, pivoting silkdome tweeter Frequency range: 45Hz-20kHz Sensitivity: 88 dB Nominal impedance: 8 ohm