Boston Acoustics - VRi565 1" pivoting aluminum VR tweeter 6-1/2" cast woofer, mounting depth: 4-11/16" floating tweeter island for better dispersion, paintable speaker grilles, cutout dimensions: 8-5/8" diameter room boundary switch compensates for placement near a corner or wall, 8-ohm impedance handles up to 125 watts, frequency response 52-22,000 Hz (3dB), sensitivity 89 dB