PRV Audio D280Ti-S 1" Titanium Compression Driver Industry standard 1-3/8"-18 TPI screw-on design Perfect for studio monitors and stage monitors, and stage speakers where high sound quality is required A 2 and 3 or bolt pattern ensures easy replacement with current 1 bolt-on horns and weighs just 3.3 lbs A standard 1 3/8 screw ensures easy replacement with current 1 horns Program Power: 160 Watts