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| SPECIFICATION | |
| Nominal Basket Diameter | 18", 457 mm |
| Nominal Impedance* | 8 Ω |
| Power Rating** | |
| Watts | 1250 W |
| Music Program | 2500 W |
| Resonance | 32 Hz |
| Usable Frequency Range | 33 Hz - 0.3 kHz |
| Sensitivity*** | 95.8 dB |
| Magnet Weight | 109 oz. |
| Gap Height | 0.375", 9.5 mm |
| Voice Coil Diameter | 4", 102 mm |
| THIELE & SMALL PARAMETERS | |
| Resonant Frequency (fs) | 32 Hz |
| DC Resistance (Re) | 5.07 Ω |
| Coil Inductance (Le) | 1.59m H |
| Mechanical Q (Qms) | 10.15 |
| Electromagnetic Q (Qes) | 0.49 |
| Total Q (Qts) | 0.47 |
| Compliance Equivalent Volume (Vas) | 331.5 liters / 11.71 cu.ft. |
| Peak Diaphragm Displacement Volume (Vd) | 1159 cc |
| Mechanical Compliance of Suspension (Cms) | 0.18 mm/N |
| BL Product (BL) | 17.2 T-M |
| Diaphragm Mass Inc. Airload (MMs) | 143 grams |
| Efficiency Bandwidth Product (EBP) | 65 |
| Maximum Linear Excursion (Xmax) | 10 mm |
| Surface Area of Cone (Sd) | 1159 cm2 |
| Maximum Mechanical Limit (Xlim) | 19.2 mm |
| MOUNTING INFORMATION | |
| Recommended Enclosure Volume | |
| Sealed | 104.80-172.70 liters / 3.70-6.10 cu.ft. |
| Vented | 118.90-303.00 liters / 4.20-10.70 cu.ft. |
| Driver Volume Displaced | 0.234 cu.ft. / 6.62 liters |
| Overall Diameter | 18", 457.2 mm |
| Baffle Hole Diameter | 16.56", 420.6 mm |
| Front Sealing Gasket | Yes |
| Rear Sealing Gasket | Yes |
| Mounting Holes Diameter | 0.28", 7.1mm |
| Mounting Holes B.C.D. | 17.25", 438.2mm |
| Depth | 8.15", 207 mm |
| Net Weight | 27.4 lbs, 12.43 kg |
| Shipping Weight | 30.9 lbs, 14.02 kgs |
| MATERIALS OF CONSTRUCTION | |
| Coil Construction | Copper voice coil |
| Coil Former | Kapton former |
| Magnet Composition | Ferrite magnet |
| Core Details | Extended core with Core Periphery Ventilation |
| Basket Materials | Die-cast aluminum basket |
| Cone Composition | Treated Paper-Kevlar |
| Cone Edge Composition | Cloth cone edge |
| Dust Cap Composition | Porous cloth top spider/ heatsink |
