Eighteen Sound 21NTLW5000.8 LF Driver 21-inch Diameter Next Generation High Performance Subwoofer Dual Tetracoil Aluminum Voice Coil 1800 Watts RMS 4000 Watts Peak 8-Ohms

.18 SOUND 21" 8 OHM EXTENDED 4.5" VC 1800
."HIGHLIGHT : 97 dB SPL 1W / 1m average sensitivity || Dual 115mm (4,5 in) Tetracoil Aluminum Voice coil || 4000 W program power handling || Ultra linear suspension behavior for excellent sound clarity || Symmetric flux density and inductance behaviour || Low noise forced air cooling design || Water repellent cone and epoxy coated plates || Suitable for vented, horn loaded and bandpass applications || "
."SPECIFICATIONS || Nominal Diameter : 533 mm ( 20.98 inch) || Nominal Impedance : 8 ? || Minimum Impedance : 6.8 ? || Nominal Power Handling1 : 1800 W || Continuous Power Handling2 : 4000 W || Sensitivity3 : 97.0 dB || Frequency Range : 30 - 1800 Hz || Voice Coil Diameter : 115 mm (4.5 in) || Winding Material : Aluminum || Winding Depth : 42.5 mm (1.67 in) || Magnetic Gap Depth : 15.0 mm (0.59 in) || "
."DESIGN || Magnaet Materials : Neo || Recommended Enclosure : 200.0 dm3 (7.06 ft3) || Recommended Tuning : 33 Hz ||
."MOUNTING AND SHIPPING INFO || Overall Diameter : 545 mm (21.46 in) || Bolt Circle Diameter : 520 mm (20.47 in) || Baffle Cutout Diameter : 492.0 mm (19.37 in) || Depth : 320 mm (12.6 in) || Flange and Gasket Thickness : 18 mm (0.71 in) || Net Weight : 12.5 kg (27.56 lb) || Shipping Weight : 13.5 kg (29.76 lb) || Shipping Box : 570x570x350 mm (22.44x22.44x13.78 in) || "
.The 21NTLW5000 is a 21 inch diameter next generation high performance subwoofer, specifically designed for high SPL very low frequency applications in either a reflex, bandpass or horn loaded configuration. We recommend the usage of power amplifiers able to deliver 4000W program power w/o clipping. 21NTLW5000 is able to perform properly under inclement weather conditions: the exclusive cone treatment improves pulp strength & gives water repellent properties to both sides of the membrane.