The ND550 is a cutting-edge high-frequency 1.75-inch diaphragm compression driver with a 1-inch exit throat, boasting top-of-the-line technologies. Crafted from pure titanium, the precision-formed diaphragm ensures exceptional performance. The suspension system, featuring a vented polyester design, minimizes distortion. The voice coil assembly, utilizing a high-temperature kapton former, guarantees durability and reliability. **Features:** - 1.75-inch Diaphragm, 1-inch Exit Throat / Pure Titanium Compression Driver - 100W continuous program power handling - Frequency range: 1200Hz - 20kHz - 3-slot optimized geometry phase plug - Titanium diaphragm - Copper inductance ring for extended response - Vented, damped, low distortion suspension system - Neodymium magnet **General Specifications:** - Exit Throat Diameter: 25.4 / 1.0 mm/inch - Rated Impedance: 8 ohm - Power handling capacity continuous program1: 100 W AES - Power handling capacity AES2: 50 W AES - Sensitivity: 109 dB - Frequency Range: 1200 Hz ÷ 20000 Hz - Diaphragm Material: Pure titanium - Suspension Material: Polyester - Suspension Design: Flat - Minimum Impedance (at 2.5kHz): 7.5 ohm - Voice Coil Diameter: 44.4 / 1.75 mm/inch - Voice Coil Material: Edgewound aluminium - Voice Coil Former Design: Straight kapton - Number of layers: 1 - outside - BL Factor: 8.1 T · m - Flux Density: 2 T - Phase Plug Design: 3 slots - Phase Plug Material: Composite - Magnetics: Neodymium - Voice Coil Demodulation: Copper ring **Mounting information:** - Overall diameter: 90 / 3.5 mm/inch - Overall height: 47 / 1.8 mm/inch - Mounting 4 × 5 mm holes at 90°: 76.2 / 3.0 mm/inch - Net weight: 1 / 2.2 kg/lbs **Shipping information:** - Package height: 8 / 3.1 mm/inch - Package width: 14 / 5.5 mm/inch - Package depth: 14 / 5.5 mm/inch - Shipping weight: 1.2 / 2.6 kg/lbs