2
JL AUDIO
M8IB5
A
B
F
C
E
D
InsTallaTIon ProCeDure
The diagram above shows the typical installation procedure into a fiberglass
panel using the supplied hardware (Classic Grille Model shown. Installation
is the same for Sport Grille Models). Always follow proper safety procedures
when working on a vessel. Use eye-protection at all times and a dust mask and
gloves when cutting.
1) Choose a flat mounting surface that has sufficient depth and air space behind
it to accept the subwoofer.
2) Cut a 7.375-inch (187 mm) diameter hole.
3) Run the speaker cable to the mounting location.
4) Place the woofer in the hole and mark the screw hole locations using a sharp,
pointed tool.
5) Remove the woofer and drill a pilot hole
(see chart on next page) in each of the screw locations. It is also advisable to use
a hand-driven countersink tool on each hole to further inhibit
gel-coat cracking of fiberglass panels.
6) Connect the speaker wires and place the woofer, with its grille in place, into the
opening (for Sport Grille models, pay attention to where the logo badge will added.
7) While holding the speaker firmly in its mounting location, evenly snug the
mounting screws in a criss-cross pattern, then hand tighten in a criss-cross pattern.
Non-standard installations may require different hardware. Always use
marine-grade, stainless-steel fasteners to ensure a secure, reliable installation.
A l l s p e c i f i c a t i o n s a r e s u b j e c t t o c h a n g e w i t h o u t n o t i c e .
PHYsICal sPeCIFICaTIons
InCluDeD ParTs
• One Polymer Subwoofer Grille
• Six #8 x 1 3/8-inch (35 mm) Phillips pan-head stainless-steel screws
• Six #8 stainless-steel washers
• Logo Badges (Sport-Grille Models Only)
One Pair Black (White & Titanium/Black Models)
One Pair Red (White & Titanium/Black Models)
One Pair White (White Models Only)
One Pair Titanium (Titanium/Black Models Only)
subwoofer Physical specifications
nominal Diameter:
8 in / 200 mm
Frame outer Diameter (a):
8.80 in / 224 mm
Bolt Hole Circle (B):
7.97 in / 202 mm
motor overmold outer Diameter (C):
5.50 in / 140 mm
Frontal Grille Protrusion* (D):
1.45 in / 37 mm
mounting Hole Diameter (e):
7.375 in / 187 mm
mounting Depth (F):
5.18 in / 132 mm
net weight:
6.82 lbs. / 3.094 Kg
Driver Displacement:
0.032 ft3 / 0.91 litres
* Frontal grille protrusion measured from mounting surface.
subwoofer Parameters
m8IB5
Free air resonance (Fs):
53.37 Hz
electrical “Q” (Qes):
0.833
mechanical “Q” (Qms):
11.827
Total speaker “Q” (Qts):
0.778
equivalent Compliance (Vas):
0.57 ft
3
/ 16.00 litres
one-way, linear excursion (Xmax)*:
0.53 in / 13.5 mm
efficiency (1w/1m)**:
86.7 dB SPL
effective Piston area (sd):
35.15 in² / 0.0227 m²
DC resistance (re):
2.958 ohm
nominal Impedance:
4 ohm
Infinite Baffle use:
Yes
enclosure use:
Yes (Sealed & Ported)
Power Handling (continuous):
200W
* Xmax specifications are derived via one-way voice coil overhang method with no
correction factors applied.
** Efficiency (1W/1m) 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” !
We recommend the use of this speaker in a bi-amplified system using high-quality satellite
speakers and amplifiers. We do not recommend the use of this subwoofer with a passive
crossover (coil), as this type of device will adversely affect performance.
