7
SUBWOOFER AMPLIFIER INSTALLATION FOR STAGE 2 SYSTEMS
This section covers the installation of the 400.1 subwoofer amplifier included in MBQX-SUB-2 in a Stage 2
system using the dual amp plate shown that should already be installed. If already installed, amp plate first
requires removal to complete this step. Review amplifier settings on page 11 of this manual.
1
2
3
Attach amplifiers* to mounting
plate with included hardware as
indicated. Use only three nuts/
bolts on 400.2 (2-ch) amplifier
due to tube frame clearance.
Make (or verify) LEVEL and HP
crossover settings as indicated
on the 400.2 amplifier.
Next, make initial LEVEL, LPF
crossover and SUBSONIC filter
settings as indicated on the
400.1 subwoofer amplifier.
4
5
6
From the top side, place
amplifier plate in the intended
location behind silver brake
booster against the driver’s
side firewall for test fitting.
Using a felt marker or punch,
mark mounting holes for
drilling. There are three holes
to mark and drill. Two at the
bottom, one at the top corner.
Drill mounting holes in the
marked locations using a
1/8” drill bit. You may wish to
remove the amp plate before
drilling to avoid scratch marks.
7
8
9
Mount amplifier plate in place
using the supplied 1/2” length
Phillips head sheet metal
screws.
Connect RCA audio cables
to the appropriate amplifier
according to your designation
at the source unit (knotted,
labeled w/tape, etc.).
Connect the electrical and
speaker plugs for each
amplifier as labeled*. Tie up
excess wiring to factory wires
and avoid any moving parts.
AMPLIFIER MOUNTING
No Nut/Bolt Here
*Note: Amplifiers appear upside down, which allows for
easier access to adjustments of gain, crossover, etc.
400.2
400.1
400.2
400.1
● XOVER SWITCH - High Pass (HP)
● LEVEL DIAL - 1/2 of the way up from 9V
● HP DIAL - Approximately 80Hz
● LP DIAL - Unused in this application
● BOOST SWITCH - 0dB Position
● LEVEL DIAL - 3/4 of the way up from 9V
● LPF DIAL - Approximately 100Hz
● SUBSONIC DIAL - Approximately 31Hz
Firewall
Top
Bottom
*Note: The third electrical connector and a “SUB 2” speaker connector are intended for the optional second subwoofer option - see pg 8-9.
Electrical & Speaker Plugs
(Use SUB 1 for Subwoofer)