Original Factory Radian Diaphragm 1750PB @ 8 ohm for Most 1.4 & 2 Radian PB or ZT 8 Ohm Drivers. Also Used On 636PB, 651PB, 745PB, 835PB, 850PB. Except 760NEOPB, 745NEOPB, 950PB. Overall Frame Diaphragm Diameter: 5.9 (150mm) Voice Coil Diameter: 2.92 (74.4mm) Diaphragm Material: Aluminium Alloy Dome with Vented Mylar Surround Nominal Impedance: 8 ohms UPC 653753246821 Brand Radian Model Name 1750PB 8 Manufacturer Radian Model Number Radian Diaphragm 1750PB Speaker Size 5.9 Inches Speaker Type Surround Sound Is Waterproof FALSE Mounting Type Flush Mount Warranty Type Limited Control Method Voice Controller Type Voice control Antenna Location For Home Audio Systems, For Car Audio Systems, For Professional Audio Equipment Audio Driver Size 5.9 Inches Audio Driver Type Dynamic Driver Audio Output Mode Surround Compatible Devices Desktop, Laptop, MP3 Player, Smartphone, Tablet, Television Number of Audio Channels 2.0 Specific Uses For Product Home entertainment systems, Car audio systems