AudioSource IC6S Round Ceiling Speakers, White (Pair) (Discontinued by Manufacturer) Stereo, in-ceiling speakers; .75-inch center-mounted tweeter, 6.25-inch woofer (per speaker) High 90 dB sensitivity for easy amplifier matching; speakers work with amplifiers up to 75 watts per channel 43 to 24,000 Hz frequency response for detailed, full-bodied sound with extended high-frequency response optimal for high-resolution sources Installation required Measures 9 x 3.25 inches each (diameter x depth)