AudioSource IC5S Round Ceiling Speakers, White (Pair) (Discontinued by Manufacturer) Stereo, in-ceiling speakers; .75-inch center-mounted tweeter, 5.25-inch woofer (per speaker) High, 90 dB sensitivity for easy amplifier matching; speakers work with amplifiers up to 60 watts per channel 50 to 22,000 Hz frequency response for detailed, full-bodied sound Installation required Measures 7.75 x 3.125 inches (diameter x depth)