8
SUBWOOFER AMPLIFIER INSTALLATION FOR STAGE 3 and 5 SYSTEMS
This section covers the installation of the 400.1 subwoofer amplifier included in MBQX-SUB-2 in a Stage 3
or 5 system using the MBQX-SUB-ACC-1 accessory amp plate shown. Review amplifier settings on page 11
of this manual and esure both subwoofer amplifier settings are matched as close as possible.
2
3
Begin by identifying the
amplifier mounting plate and
hardware. Stage 3 and 5
systems require the accessory
amp plate MBQX-SUB-ACC-1.
Attach 400.1 amplifier to
mounting plate with included
hardware as indicated. Use
only three nuts/bolts due to
tube frame clearance.
Next, make initial LEVEL, LPF
crossover and SUBSONIC filter
settings as indicated on the
400.1 amplifier (Sub Amp 2).
5
6
Unplug the SUB RCA audio
input cables at the 400.1
amplifier on the dual amp plate
(Sub Amp 1). Connect splitters
and RCA extension as shown*.
Route power, speaker wiring
and RCA extension to amplifier
location (near frame tubes).
Place mounting clamps in initial
locations as shown.
Place amplifier & plate into its
location. Attach the supplied
Phillips screws and 7/16” nuts
through the clamp holes and
tighten until amplifier is secure.
7
8
9
Connect the RCA audio cable
extension to Sub Amp 2 inputs.
Position of right or left RCA
plugs does not matter because
the output signal is mono.
Connect the speaker (Sub 2)
and power harness connectors
as shown.
Zip tie the wiring neatly to
ensure no connectors come
loose. Avoid any moving parts
(such as steering mechanism),
moisture or heat sources.
● BOOST SWITCH - 0dB Position
● LEVEL DIAL - 3/4 of the way up from 9V
● LPF DIAL - Approximately 100Hz
● SUBSONIC DIAL - Approximately 31Hz
No
Nut/
Bolt
Here
From SUB
OUT on
Source Unit
To Sub Amp 1
Inputs
To Sub Amp 2
Inputs
*Note: Which RCA plug goes to left or right inputs
doesn’t matter as the amp output is mono
Route wiring to
amp location
AMPLIFIER MOUNTING
1
4
MBQX-SUB-ACC-1
