The PRV Audio D290Py-S 1″ Pro Audio Compression Driver offers unsurpassed vocal and midrange reproduction. Perfect for studio monitors and stage monitors, and stage speakers where high sound quality is required. Throat Diameter: 1″ Type: Screw-On Nominal Impedance: 8 Ohms Rated AES Power Handling (RMS): 90 Watts Program Power: 180 Watts The Polyimide diaphragms supersede titanium diaphragms, being able to play low frequencies without shattering and performing more accurately at high frequencies. A specially designed and easily replaceable Polyimide diaphragm on a Kapton former results in a more natural sound with smoother and more accurate high frequency reproduction. The D290Py-S is perfect for stage monitors, studio monitors, and other loudspeaker enclosures where high sound quality and light weight is required. The D290Py-S is assembled with a standard 1 3/8” screw for easy replacement with current 1” horns.