8" JL Audio Marine Subwoofer Driver - M6-8IB-S-GwGw-4

General Specifications

• Continuous Power Handling (RMS) : 200 W
• Nominal Impedance (Znom) : 4 Ω

Physical Specifications

• Nominal Diameter : 8.0 in / 200 mm
• Overall Diameter (A) : 8.80 in / 224 mm
• Bolt Hole Circle Diameter (B) : 7.97 in / 202 mm
• Frontal Grilles Protrusion* (C) : 1.45 in / 37 mm
• Mounting Hole Diameter (D) : 7.375 in / 187 mm
• Mounting Depth (E) : 5.00 in / 127 mm
• Driver Displacement : 0.033 cu ft / 0.93 L
• Net Weight : 8.70 lbs / 3.90 kg

Parameters

• Free Air Resonance (Fs) : 54.92 Hz
• Electrical “Q” (Qes) : 0.852
• Mechanical “Q” (Qms) : 10.314
• Total Speaker “Q” (Qts) : 0.787
• Equivalent Compliance (Vas) : 0.54 cu ft / 15.29 L
• One-Way Linear Excursion (Xmax)* : 0.53 in / 14 mm
• Reference Efficiency (no) : 0.28%
• Efficiency (1 W / 1 m)** : 86.7 dB SPL
• Effective Piston Area (Sd) : 35.15 sq in / 0.0227 sq m
• DC Resistance (Re) : 2.993 Ω

* 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

• Wall Thickness : 0.75 in / 19 mm
• Front Baffle Thickness : 0.75 in / 19 mm
• Volume (net int.) : 2.00 cu ft / 56.6 L
• External Width (W) : 16 in / 406 mm
• External Height (H) : 16 in / 406 mm
• External Depth (D) : 18.25 in / 464 mm
• F3 : 51.78 Hz
• Fc : 61.89 Hz
• Qtc : 0.8869

Enclosure Notes

* The enclosure recommendations listed above are external dimensions which assume the use of 0.75 in (19 mm) thick material. If you are using 0.625 in (16 mm) thick material, subtract 0.25 in (6.5 mm) from each dimension. Do not use any material with a thickness of less than 0.625 in (16 mm) as this may compromise the rigidity of the enclosure. * All enclosure volumes listed above are net internal volumes! Driver displacement, port displacement and brace displacement must be added to obtain the final gross internal volume. All enclosure dimensions above have already taken this into account. * When using multiple subwoofers in a common enclosure you will need to recalculate the enclosure and port dimensions. For assistance please contact your authorized JL Audio dealer or JL Audio Technical Support. * We recommend the use of this speaker in a bi-amplified system using high-quality satellite speakers and a high-quality amplifier. We do not recommend the use of this subwoofer with a passive crossover (coil), as this type of device will adversely affect performance. * All specifications are subject to change without notice.

Safety Notice

Prolonged exposure to sound pressure levels in excess of 100dB can cause permanent hearing loss. This high-performance speaker can exceed this level. Please exercise restraint in its operation in order to preserve your ability to enjoy its fidelity.

When installing a subwoofer in your vehicle, it is extremely important to secure the enclosure firmly. We recommend bolting the enclosure through the metal of the floorpan or the frame of the vehicle with large diameter washers for reinforcement. If an enclosure is not firmly attached, it can become a projectile in a collision. This is particularly important in a hatchback, station wagon, sports utility vehicle, or van.

Ported Enclosure Specifications

• Wall Thickness : 0.75 in / 19 mm
• Front Baffle Thickness : 0.75 in / 19 mm
• Volume (net int.) : 1.50 cu ft / 42.5 L
• External Width (W) : 16 in / 406 mm
• External Height (H) : 16 in / 406 mm
• External Depth (D) : 15.125 in / 384 mm
• Internal Port Diameter (ID) : 4 in / 102 mm
• Port Length (L) : 13.50 in / 343 mm
• Tuning Frequency (Fb) : 37 Hz
• F3 : 31.26 Hz

Enclosure Notes

* The enclosure recommendations listed above are external dimensions which assume the use of 0.75 in (19 mm) thick material. If you are using 0.625 in (16 mm) thick material, subtract 0.25 in (6.5 mm) from each dimension. Do not use any material with a thickness of less than 0.625 in (16 mm) as this may compromise the rigidity of the enclosure. * All enclosure volumes listed above are net internal volumes! Driver displacement, port displacement and brace displacement must be added to obtain the final gross internal volume. All enclosure dimensions above have already taken this into account. * When using multiple subwoofers in a common enclosure you will need to recalculate the enclosure and port dimensions. For assistance please contact your authorized JL Audio dealer or JL Audio Technical Support. * We recommend the use of this speaker in a bi-amplified system using high-quality satellite speakers and a high-quality amplifier. We do not recommend the use of this subwoofer with a passive crossover (coil), as this type of device will adversely affect performance. * All specifications are subject to change without notice.

Safety Notice

Prolonged exposure to sound pressure levels in excess of 100dB can cause permanent hearing loss. This high-performance speaker can exceed this level. Please exercise restraint in its operation in order to preserve your ability to enjoy its fidelity.

When installing a subwoofer in your vehicle, it is extremely important to secure the enclosure firmly. We recommend bolting the enclosure through the metal of the floorpan or the frame of the vehicle with large diameter washers for reinforcement. If an enclosure is not firmly attached, it can become a projectile in a collision. This is particularly important in a hatchback, station wagon, sports utility vehicle, or van.