Description
The latest addition to the popular Kappa series of drivers, the Kappa Pro 18LF provides tons of low frequency output in a lightweight, durable cast aluminum chassis. Use it as a subwoofer in small to medium sized boxes, a woofer in large three-way PA enclosures, or as a high-power bass guitar woofer. The 1,600 watt program power rating makes it an easy choice for new box designs or as a replacement for many single and double subwoofer cabinets.
Manufacturer Spec Sheet
Example Cabinet Designs
| Specification | |
| Nominal Basket Diameter | 18", 457 mm |
| Nominal Impedance* | 8 Ω |
| Power Rating* | |
| Program Power | 1600 W |
| Watts | 800 W |
| Resonance | 32 Hz |
| Usable Frequency Range | 38 Hz - 0.7 kHz |
| Sensitivity* | 98 dB |
| Magnet Weight | 120 oz. |
| Gap Height | 0.37", 9.5 mm |
| Voice Coil Diameter | 3", 76 mm |
| Thiele & Small Parameters | |
| Resonant Frequency (fs) | 32 Hz |
| DC Resistance (Re) | 5.39 Ω |
| Coil Inductance (Le) | 1.21m H |
| Mechanical Q (Qms) | 10.66 |
| Electromagnetic Q (Qes) | 0.34 |
| Total Q (Qts) | 0.33 |
| Compliance Equivalent Volume (Vas) | 391.61 liters / 13.83 cu.ft. |
| Peak Diaphragm Displacement Volume (Vd) | 927.2 cc |
| Mechanical Compliance of Suspension (Cms) | 0.21 mm/N |
| BL Product (BL) | 19.39 T-M |
| Diaphragm Mass Inc. Airload (MMs) | 119 grams |
| Efficiency Bandwidth Product (EBP) | 94 |
| Maximum Linear Excursion (Xmax) | 8 mm |
| Surface Area of Cone (Sd) | 1159 cm2 |
| Maximum Mechanical Limit (Xlim) | 18 mm |
| Mounting Information | |
| Recommended Enclosure Volume | |
| Sealed | N/A |
| Vented | 113.27-353.96 liters / 4-12.5 cu.ft. |
| Driver Volume Displaced | 0.234 cu.ft. / 6.62 liters |
| Overall Diameter | 18", 457.2 mm |
| Baffle Hole Diameter | 16.58", 421.1 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 | 24.5 lbs, 11.11 kg |
| Shipping Weight | 28.1 lbs, 12.75 kgs |
| Materials of Construction | |
| Coil Construction | Copper voice coil |
| Coil Former | Kapton former |
| Magnet Composition | Ferrite magnet |
| Core Details | Vented and extended core |
| Basket Materials | Die-cast aluminum basket |
| Cone Composition | Treated paper cone |
| Cone Edge Composition | Cloth cone edge |
| Dust Cap Composition | Treated paper dust cap |