MB QUART MBQJL-SUBR-1 User manual

Page 1 of 17
Assembly Instructions
Model: Wrangler (JL)
Description: Jeep Wrangler OEM Subwoofer Upgrade Kit Installation
Part Number: MBQJL-SUBR-1
Assembly Time: 60 Minutes (1 Hour)
Tools Required
1T20 & T30 Torx Driver
25mm Allen Wrench
3Pry Tool
4 Utility Knife
Parts List
No. Component Name Qty
1 Subwoofer 1
2 MB Quart Grill Emblem 1
3 Poly Fill Sheets 2
Before you begin, read though these instructions and check that all
parts are present. Please note that MB Quart cannot assume any
responsibility for damage resulting from incorrect installation.

Page 2 of 17
Disassembly
● Remove jack cover panel

Page 3 of 17
Disassembly
● Remove three tie down hooks
with T30 Torx Driver and remove
● *For Wrangler 4XE lift up the
panel behind rear seat and
remove*

Page 4 of 17
Disassembly
● Remove T20 Torx screw from the
front side of the subwoofer panel
● Pop the rear seatbelt cover panel
up and pry subwoofer enclosure
off the rear quarter panel

Page 5 of 17
Disassembly
● Disconnect the subwoofer
enclosure wire harness
● Remove the T20 Torx screw
from the rear of the subwoofer
enclosure
● Remove the eight 5mm allen
screws from the perimeter of the
subwoofer

Page 6 of 17
Disassembly
● Gently pry up the OEM grill from
the subwoofer frame
● Remove and disconnect the
subwoofer.

Page 7 of 17
Disassembly
● Gently remove the original
emblem from the front of the
OEM grill
● Remove the OEM subwoofer
wiring and grommet from the
enclosure

Page 8 of 17
Installation
● Install provided wiring harness
and grommet into the enclosure

Page 9 of 17
Installation
into the enclosure while keeping
the screw hole clear

Page 10 of 17
Installation
● Cut and remove eight plastic tabs
on enclosure using a utility knife

Page 11 of 17
Installation
● Connect the subwoofer to the
wire harness NOTE: Red to
Positive and Black to Negative

Page 12 of 17
Installation
● Install MB Quart subwoofer
● Install the OEM T20 Torx screw
to the rear of the enclosure

Page 13 of 17
Installation
● Install the new MB Quart emblem
onto the grill, attach the grill and
trim ring reusing the eight 5mm
allen screws
● Place the subwoofer enclosure
into the vehicle

Page 14 of 17
Installation
● Route wiring towards your
case of the MBQJ-STG6-A-1 this
will be under your passenger
seat)
● Recommended amplifier
crossover and gain settings with
the MBQJ-STG6-A-1 kit are:
Gain turned up to the
1 O’clock position
LPF turned up to the
2 O’clock position
Subsonic turned up to the
9 O’clock position

Page 15 of 17
Installation
● Reinstall the subwoofer enclosure
into the quarter panel area and
place the seat belt cover back in
place
● Reinstall T20 Torx screw to the
front of the enclosure

Page 16 of 17
Installation
tie down hooks with T30 Torx
screws
● *For Wrangler 4XE install the
panel behind rear seat*

Page 17 of 17
Installation
● Install jack cover
your MB Quart Subwoofer
Upgrade
MBQJL-SUBR-1 REV 01