Dual Subwoofer Installation Manual

Dual Subwoofer Installation Manual
8" Bandpass Enclosure with Built-in Amplifier
Getting Started
Thank you for purchasing the Dual SBP8A 8" Bandpass Enclosure with built-in
Amplifier. Although Dual has attempted to ensure the information in this manual
is accurate, please be aware that any part of it is subject to change without notice.
Please read entire manual before installation. Due to the technical nature of
amplifiers, it is highly recommended that your Dual SBP8A is installed by a
professional installer or an authorized dealer.
Before You Start
•Always disconnect the negative battery terminal. Consult a qualified technician
for instructions if you are unsure.
•Avoid installing the amplifier where it would be subject to high temperatures,
such as from direct sunlight, or where it would be subject to dust, dirt or
excessive vibration.
•Use extreme caution when drilling holes to avoid damaging fuel lines or
existing vehicle wiring. •All amplifier installations require power, signal and speaker wires (not
•An amplifier installation kit (sold separately) is highly recommended to
facilitate the installation. Consult your dealer for recommendations. Mounting Location
•Choose a mounting location for the SBP8A. Suggested locations include behind
a seat or in the trunk.
•The SBP8A can be mounted horizontal (recommended) or vertical. For
optimum performance, make sure to provide at least 1" of space around all
sides of the amplifier.
•Do not mount the SBP8A under carpets or where airflow is restricted.
•Do not install the SBP8A where it may be exposed to moisture.
•The optimum mounting location varies between vehicles. Remember to test all
amplifier functions before completing the final mounting procedure.
Safety First
The following instructions are designed to ensure safety during installation and
use of the SBP8A. Failure to heed these instructions can result in injury or damage
to the unit or vehicle.
The following installation instructions are intended to be used as a basic
guideline. If you feel unsure about installing this speaker system yourself, Dual
recommends acquiring the services of a professional car audio installation
Before installation, please review the following guidelines:
1. Be sure to carefully read and understand the instructions before attempting to
install this product.
2. For safety, disconnect the battery negative terminal prior to beginning the
3. If additional wiring is required, we recommend running all wires prior to
mounting your bandpass enclosure in place.
4. To ensure reliable performance and minimize signal or power loss, use the
highest quality connectors available.
5. Use caution before you drill or cut! Be careful not to cut or drill into gas tanks,
fuel lines, brake or hydraulic lines, vacuum lines or electrical wiring when
working on any vehicle.
6. Never run speaker wires underneath your vehicle. Running speaker wires
inside the vehicle provides the best protection from exhaust, heat and
environmental elements.
7. Avoid running wires over, near or through sharp-edged surfaces. We suggest
you also use rubber grommets to protect any wires routed through metal,
especially the firewall.
8. When running the speaker cable to the amplifier, avoid running it near sources
of high current (i.e. wiring harnesses, battery cables).
Connection Descriptions
Be sure to follow specific instructions included with your amplifier installation
kit (not included with this amplifier). The information below should be used a
general guideline only.
Power Wire (BAT+)
•Disconnect negative battery terminal before proceeding. Consult a qualified
technician for instructions if you are unsure.
•Plan wire routing before cutting any wires to length. Begin by routing the power
BAT+ wire from the battery to the amplifier location. Use a grommet when
running wires through the firewall or metal openings. Avoid running the power
wire near existing vehicle wiring to prevent induced noise from entering the
audio system.
•Use extreme caution when drilling holes to avoid damaging fuel lines or
existing vehicle wiring. •The BAT+ wire MUST be fused within 18" of the battery for protection of the
vehicle’s electrical system.
Ground Wire (GND)
•The amplifier ground wire should be as short as possible. Choose a clean
unpainted section of metal or the vehicle chassis when attaching the ground
connection. Be sure to clean the area of any dirt or grease.
Remote Turn-on Wire (REM)
•The remote turn-on wire connects to the head unit's amplifier turn-on lead or
other switched 12 volt source.
Input Signal
•The amplifier's input signal connects to the head unit's low level (RCA) or high
level (speaker wire) outputs.
•Dedicated subwoofer or low level inputs signal deliver the best performance. If
unavailable, use the high level inputs - when interfacing with factory head unit
for instance. Be sure to observe the correct polarity when using the high level
•Do not use both low and high level inputs at the same time - connect only one
or the other.
•Never run any wires underneath or outside the vehicle.
Connections and Controls
Crossover Frequency
Power Connections
Phase Control
Input Level Control
Low Level Inputs
High Level Inputs
LED Indicator
Typical Wire Routing
Main Power Connections
Connect BAT+, GND and REM wires accordingly. A suitable fuse MUST be installed on the
BAT+ lead within 18" of the battery for protection of the vehicle’s electrical system.
Fuse Rating
When replacing the fuse, make
sure new fuse is the correct type
and amperage. Using an incorrect
fuse could damage the amplifier.
The SBP8A uses (1) 7.5 amp ATO
style fuse.
Power/Ground Wire Size
For optimum performance, use only
12 gauge wire or larger. Make sure
to use the same size power and
ground wire.
Setup and Adjustment of Controls
Input Signal Connections
Low Level (RCA)
Low level (RCA) input signal is preferred for best
performance. Typical trunk-mount installations
require a 17-20 foot RCA cable. Most trucks and
behind-seat applications require a 6-12 foot RCA
cable. Using twisted pair construction RCA cables
will minimize noise.
High Level Input High level inputs should only be used when RCA
(Speaker Wire) outputs are not available from the head unit. Connect
the head unit speaker outputs to the high level input
connector shown on page 6. Do not use both low and
high level inputs at the same time - connect only one
or the other.
Crossover Frequency
Phase Control
Input Level Control
LED Indicator
The adjustable crossover is used to filter out
frequencies above 70Hz ~ 200Hz. Adjust it to where
the SBP8A sound output blends with the rest of the
sound system.
The phase control compensates for delay between
the SBP8A output and the rest of the sound system.
Begin with the phase control set to 0 degrees. If
the sound is adequate from the normal listening
position inside the vehicle, no further adjustment is
necessary. If the sound is thin or lacking bass, adjust
the phase control until the bass is full and punchy.
The input level control (gain) is used to obtain the
best possible match between the head unit audio
output and the amplifier input. Begin by turning
the input level control fully counterclockwise. Next,
turn up the head unit volume control around 3/4 of
the way up. Adjust the input level control clockwise
until audible distortion is heard, then slightly
counterclockwise to provide the best match.
The LED indicator illuminates blue during normal
Unit will not turn on
(no power LED indicator)
BAT+ wire not connected or incorrect voltage
REM wire not connected or incorrect voltage
Check connections for proper voltage
GND wire not connected
Check connection to ground
Fuse(s) blown
Replace fuse(s)
Volume turned all the way down
Increase volume level at head unit
Speaker defective or damaged
Check/replace speaker
Input signal not connected
Check high or low level inputs for
proper connection
Unit has power - LED is
blue (but no sound)
Unit blows fuse(s)
Incorrect fuse rating
Use fuse(s) with correct rating
BAT+ wire touching chassis ground
Check for pinched wire
Speaker defective or damaged
Check/replace speaker
Bad ground connection
Make sure amplifier is grounded to
clean bare metal
Signal ground loop or RFI (radio frequency
Re-route RCA cables from existing
high current wiring
Distorted audio output
Incorrect input signal type or
input level too high
Check connections and reduce/adjust
input level
Low audio output
Incorrect input signal type or
input level too low
Check connections and increase or
adjust input level
Low frequency output is out of phase
Adjust phase control as needed
Engine noise
Weak bass
Limited One Year Warranty
This warranty gives you specific legal rights.
You may also have other rights which vary
from state to state.
Dual Electronics Corp. warrants this product
to the original purchaser to be free from
defects in material and workmanship for a
period of one year from the date of the original
Dual Electronics Corp. agrees, at our option,
during the warranty period, to repair any defect
in material or workmanship or to furnish an
equal new, renewed or comparable product
(whichever is deemed necessary) in exchange
without charges, subject to verification of the
defect or malfunction and proof of the date of
purchase. Subsequent replacement products
are warranted for the balance of the original
warranty period.
What to do?
1. Before you call for service, check the
troubleshooting guide in your owner’s
manual. A slight adjustment of any custom
controls may save you a service call.
2. If you require service during the warranty
period, you must carefully pack the product
(preferably in the original package) and ship
it by prepaid transportation with a copy of
the original receipt from the retailer to an
authorized service center.
3. Please describe your problem in writing and
daytime phone number with your shipment.
4. Formoreinformationandforthelocationof
Who is covered? This warranty is extended
to the original retail purchaser for products
purchased and used in the U.S.A.
What is covered? This warranty covers all
defects in material and workmanship in
this product. The following are not covered:
installation/removal costs, damage resulting
from accident, misuse, abuse, neglect, product
modification, improper installation, incorrect
line voltage, unauthorized repair or failure to
follow instructions supplied with the product,
or damage occurring during return shipment
of the product.
Exclusion of Certain Damages: This warranty
is exclusive and in lieu of any and all other
warranties, expressed or implied, including
without limitation the implied warranties of
merchantability and fitness for a particular
purpose and any obligation, liability, right,
claim or remedy in contract or tort, whether
or not arising from the company’s negligence,
actual or imputed. No person or representative
is authorized to assume for the company any
other liability in connection with the sale of
this product. In no event shall the company be
liable for indirect, incidental or consequential
For Your Records
Please keep your original sales receipt and be prepared to
original receipt is considered the best proof of purchase and
indicates the date you purchased your Dual product.
Dealer Name
Dealer Phone
Purchase Date
Maximum Output Power
160 watts
Continuous Output Power
80 watts
Frequency Response
S/N Ratio @ 1 watt
Input Impedance
Low level (RCA): 10k ohms
High level (speaker): 2K ohms
Input Sensitivity (RCA)
50mV – 3V
Crossover Frequency
Crossover Slope
0–180 degrees
7.5 amp ATO
15.35” x 9.22” x 15.35” (WxHxD)
Design and specifications subject to change without
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