JL AUDIO 8W7AE-3 - 20cm Subwoofer

8W7AE-3
10th Anniversary Edition - W7 8-inch Subwoofer Driver (500 W, 3 ohms)

• This subwoofer driver has been called the "best damn 8-inch subwoofer ever made" for its remarkable performance capabilities and design attributes. An impressive linear excursion envelope that exceeds 0.75 in. (19 mm) one-way allows it to deliver impact well beyond the range of other 8-inch subwoofer drivers.
• The 8W7AE is best used with amplifier power in the 200W - 500W range and is optimized to operate in a 0.875 cu. ft. (24.8 l) sealed enclosure, or a 1.0 cu. ft. (28.3 l) ported enclosure. Detailed enclosure recommendations can be found in the "Specifications" tab.
• W7AE (Anniversary Edition) Subwoofers celebrate the 10th Anniversary of the launch of the W7 subwoofers. Functionally, they are identical to the original W7's, but are they distinguished by the following cosmetic differences:

• Satin-Black Powdercoated Baskets
• Bright Anodized Surround Clamp Ring
• Anniversary Edition Cone Badge
• Anniversary Edition Terminal Label

Key-Specifications

• DMA-optimized motor systems = less distortion and higher performance
• Very linear, FEA-optimized suspension = low distortion and higher reliability
• W-Cone = low mass with excellent stiffness
• OverRoll Surround = extreme excursion without loss of cone surface
• Radially drilled pole piece = improved energy treatment by venting the interior of the gap
• Height-adjustable frame cooling system = improved load-bearing capacity by direct ventilation of the coil
• Plateau Reinforced Spider Attach (RC) = mechanical reinforcement of the spider fixation
• FCAM mounting system = improved moving parts alignment
• Lead wire management system = improved reliability of the lead wire without affecting the spider

General Specifications

• Continuous Power Handling (RMS): 500 W
• Recommended Amplifier Power (RMS): 200 - 500 W
• Nominal Impedance (Znom): 3 Ohm

Physical Specifications (Abb.)

• Nominal Diameter: 8.0 in / 200 mm
• Overall Diameter (A): 8.5 in / 216 mm
• Mounting Hole Diameter (B): 6.94 in / 176 mm
• Bolt Hole Circle Diameter (C): 7.39 in / 188 mm
• Motor Outer Diameter (D): 5.79 in / 147 mm
• Mounting Depth (E): 6.83 in / 173 mm
• Driver Displacement: 0.06 cu ft / 1.7 L
• Net Weight: 17 lb / 7.8 kg

Parameters

• Free Air Resonance (Fs): 35.2 Hz
• Electrical “Q” (Qes): 0.654
• Mechanical “Q” (Qms): 9.5
• Total Speaker “Q” (Qts): 0.612
• Equivalent Compliance (Vas): 0.61 cu ft / 17.4 L
• One-Way Linear Excursion (Xmax)*: 0.75 in / 19 mm
• Reference Efficiency (no): 0.11%
• Efficiency (1 W / 1 m)**: 82.7 dB SPL
• Effective Piston Area (Sd): 38 sq in / 0.0245 sq m
• DC Resistance (Re): 2.78 ohms

* Xmax specifications are derived via one-way voice coil overhang method with no correction factors applied.
** Efficiency (1 W / 1 m) is not an accurate indicator of a subwoofer’s output capability and should not be used as a comparison to other subwoofers to determine which one is “louder”.

Sealed Enclosure Specifications (Abb.)

• Wall Thickness: 0.75 in / 19 mm
• Front Baffle Thickness: 0.75 in / 19 mm
• Volume (net int.): 0.875 cu ft / 24.8 L
• External Width (W): 12.875 in / 327 mm
• External Height (H): 12.875 in / 327 mm
• External Depth (D): 14 in / 356 mm
• F3: 41.3 Hz
• Fc: 45.9 Hz
• Qtc: 0.798

Ported Enclosure Specifications (Abb.)

• Wall Thickness: 0.75 in / 19 mm

• Front Baffle Thickness: 0.75 in / 19 mm

• Volume (net int.): 1.00 cu ft / 28.3 L

• External Width (W): 18.75 in / 476 mm

• External Height (H): 12.875 in / 327 mm

• External Depth (D): 14 in / 356 mm

• Internal Slot Port Width (SW): 1.375 in / 35 mm

• Internal Slot Port Height (SH): 11.375 in / 289 mm

• Internal Slot Port Length (SL): 27.875 in / 708 mm

• Port Extension Length (EL): 13.1875 in / 335 mm

• Tuning Frequency (Fb): 36.8 Hz

• F3: 30.1 Hz

Enclosure Notes
Net volumes given above do not include the air volume displaced by the speaker (Driver Displacement). This value must be added to the net volume along with the displacement of any braces and/or ports (if applicable) to arrive at a gross internal volume. Air inside a port is not part of the effective net volume. Calculate ports as solid, not hollow objects.

* The W7’s employ a pole vent to remove heat and pressure from the inside of the speaker.This vent is located at the rear of the speaker. A minimum distance of 0.75 in (19 mm) is required between the back of the speaker and any wall of the enclosure to allow proper operation of the pole vent.

The dimensions given for the enclosure examples above take all applicable displacements into consideration

Safety Notice
It is absolutely essential that the completed subwoofer enclosure is mounted firmly to the vehicle with heavy steel bolts (0.5 in diameter) and large steel washers on both sides of the bolts. This will reduce the likelihood of occupant injury in the event of a collision or sudden deceleration.