6
7
POWER SUPPLY CONNECTIONS
Positive:
Connect a wire (at least 12-gauge)
between the vehicles
+(positive)
battery
terminal and the "+12V" connection on BP112
amplifier. You must install a fuse holder with a
50-75A fuse, within 18" of the battery. Route
the power wire through a grommet in the
vehicle's firewall. If there is not factory
grommet available, you must install one.
Negative:
Connect a wire (at least 12-gauge)
betwee
n
the
-
(
ground
) connection on BP112
amplifier
and a bare metal surface near the
mounting location. You may need to scrape
away some paint from the metal surface to
insure a good connection. Use a screw and a
lock (star) washer.
Remote:
Connect a wire (usually blue)
between the remote terminal on BP112 and
the remote output wire on the back of your
head unit (deck). This wire should provide
b5VDC and +12VDC when the unit
is on and no voltage when the unit is off.
Note:
If your head unit provides preamp outputs it will have remote wire. If your
radio provides only high-level outputs, it may not have a remote wire. If you will
be using the high level outputs from your head unit, you do not need to connect
the remote output. The speaker level inputs will sense voltage on the speaker
wires and BP112 will turn itself on. If you are using only lin-level (RCA) inputs,
you must connect the remote wire to the BP112.
Input Connections:
Note:
BP112 is equipped with two line level (RCA) inputs and four high level
inputs. Any combination of high-level and speaker-level inputs may be used to
provide nonfading bass when connected to a head unit with four outputs.
Head units with dedicated subwoofer outputs
(line level):
Connect the
subwoofer output form the head unit to line-level inputs.
Head units with four line-level (RCA) outputs:
Connect the four high-level outputs to the four high-level inputs on the BP112.
Power-Supply Connections
Min
Level
Max Min
Bass
Boost
Max
LPF
50Hz
300Hz
Fuses
POWER
HI INPUT
L+
L-
R+
R-
LOW
INPUT
L
R
Protection
Power Thermal OC DC
BASS
EXT
ON
OFF
Remote
ON
OFF
Subsonic
0
180
Phase Shift
15A 15A
REM GND +12V
BP112 provides several controls that simplify sonic integration with virtually any
vehicle’s unique acoustic properties. Please read the following section carefully
to familiarize yourself with the function of each control.
Controls
Level:
The Level control is a rotary knob on the panel with the electrical
connections. This switch will line match the voltage of your head unit, which will
deliver high sound quality and performance.
Bass Boost:
BP112’s interaction with the acoustics of your vehicle may produce
a peak or dip in BP112’s response. For the vast majority of vehicles, these peaks
or dips occur at about 40Hz — around the frequency of a low bass guitar note.
Use this control to correct that peak or dip. Adjustment between –6dB and +3dB
is possible. Although response without any sharp peaks or dips is technically
correct, you may choose the position that best suits your taste.
LPF:
The low-pass filter, blocks unwanted high frequencies to allow cleaner low-
frequencies.
Gain Control / Remote Gain:
This control will adjust the input sensitivity of
BP112. Use this control to adjust the relative volume (loudness) of BP112 with
respect to the other speakers in the vehicle. To use the remote gain control you
must set the main gain to it's max level, then adjust the remote gain to your
preference.
Note:
If the main gain is not set to max then it will limit the usability of
the remote gain. Also be sure to make sure that your system is turned OFF while
executing this process, so that you do not damage your amplifier or subwoofer.
Subsonic:
BP112’s interaction with the acoustics of your vehicle may produce a
peak or dip in BP112’s response. For the vast majority of vehicles, these peaks or
dips occur at about 40Hz — around the frequency of a low bass guitar note. Use
this control to correct that peak or dip. Adjustment between –6dB and +3dB is
possible. Although response without any sharp peaks or dips is technically
correct, you may choose the position that best suits your taste.
www.earthquakesound.com
TUNING BP112
Specifications Are Subject To Change Without Notice
