9
ADD-ON SUBWOOFER INSTALLATION FOR STAGE 3 and 5 SYSTEMS
This section covers the installation of the 10” subwoofer included in MBQX-SUB-2 as the second subwoofer
in a Stage 3 or 5 system. This upgrade requires front passenger seat removal prior to installation. Refer to
Page 3 for seat removal procedure.
2
3
Identify front enclosure
brackets. Orientation is
referenced to the logo. Left and
right are stamped “L” and “R”
on the bracket and enclosure.
Remove the factory-supplied
aluminum spacers from rear
bolts of seat mounts*. Replace
with supplied MB Quart
spacers for bracket tolerance.
Load subwoofer enclosure into
under passenger seat position
by angling the front under the
support bar for clearance of the
brake line and to sit level.
5
6
Align rear enclosure brackets
over threaded seat mounts
so they sit atop the aluminum
spacers. Route wiring toward
center console area.
Attach front right side mounting
brackets to the subwoofer
enclosure using two 1/2” bolts
and a lock washer on each.
Attach front left side mounting
brackets to the subwoofer
enclosure using two 1/2” bolts
and a lock washer on each.
7
8
9
Attach a 1/2” bolt, lock washer
and flat (black) washer through
the left side seat mount bracket
to the threaded insert of the left
enclosure bracket.
Attach a 1/2” bolt, lock washer
and flat (black) washer through
the right side seat mount
bracket to the threaded insert
of the right enclosure bracket.
Connect the enclosure’s wiring
to the connector at the side of
the console labeled “Sub 2.”
1
4
LEFT
RIGHT
Logo
LEFT
RIGHT
RIGHT
LEFT
*Note: If installing into a 4-seat model, these
instructions are intended for the front seats only.
2nd SUBWOOFER MOUNTING
