JL is one of the more familiar names that comes to mind when you talk about car audio subwoofers. Given the fact that the company has been specializing in car audio products since 1975 (national distribution of JL's subwoofer line started in 1992), it's no surprise that it has long been considered a top contender in the subwoofer race. Well known for their innovations, the company has been responsible for some significant improvements in subwoofer technology. They were among the earliest companies to use layered voice coil windings beyond four layers and their patented vented reinforcement collar (VRC), which greatly strengthens the critical bond between the voice coil former, spider, and cone is a seriously effective enhancement.
| Data Chart |
| Brand | JL Audio |
| Model | 18W3 |
| MSRP | $499.00 |
| Warranty | 2 yr. |
| (dealer installed or dealer approved) |
| Mechanical Specifications |
| Weight | 23 lbs. |
| Rear mounting clearance | 9.125" |
Woofer Magnet dim. (dia. x ht. in mm)
(using two stacked magnets) | 162 x 44 |
| Woofer Voice coil diameter (mm) | 63 (2.5) |
| Voice coil wire layers | 4 |
| Measured T/S parameters |
| Nominal Impedance (Ohms) | 4 |
| Revc (Ohms) | 3.35 |
| (both 1.67 ohm voice coils connected in series) |
| Sd (cone area in sq. Meters) | 0.110 |
| BL (motor strength in Tesla Meters) | 20.3 |
| Vas (in Liters) | 283.8 |
| Cms (micrometers per Newton) | 163.8 |
| Mms (Grams) | 393.1 |
| Fs (Hz) | 19.8 |
| Qms | 7.41 |
| Qes | 0.40 |
| Qts | 0.38 |
| Power and Excursion Data |
| Sensitivity (2.83V/1M in dB) | 92.7 |
| Continuous power handling (watts) | 400 |
| Peak power handling (watts) | 800 |
| Xmax ([coil length-gap height]/2 in mM) | 12.8 |