SPT-31GM
Speaker System for
Chevrolet/GMC
Installation Manual
Model: Select GM Trucks and SUVs
Model Year: 2014-up Trucks
Compatible Vehicles*
Year Model Configuration Trim
Chevrolet
2014-up Silverado 1500
Silverado 2500HD Double/Crew Cab WT, LT, LTZ
Silverado 3500HD Double/Crew Cab WT, LT, LTZ
Double Cab WT, LS, Custom, LT, LTZ
Crew Cab WT, LS, LT, LT Z71, LTZ, LTZ Z71
Chevrolet/GMC
FULL SIZE TRUCK 1/14
GMC
* The specified vehicles have been tested and have met compatibility specifications at the time of testing.
Compatibility is not guaranteed if the manufacturer has made production changes to the vehicles listed above.
Factory systems equipped with Bose are not compatible with this system.
2014-up
Sierra 1500 Double/Crew Cab Sierra, SLE, SLT
Sierra 2500HD Double/Crew Cab Sierra, SLE, SLT
Sierra 3500HD Double/Crew Cab Sierra, SLE, SLT
Introduction
Design and specifications are subject to change without notice for improvement.
To Ensure Safe Use, Always Follow These Precautions
The installation of this product requires specialized skills and experience. We recommend that you have the
product installed by an authorized Alpine dealer.
Before you use this product, be sure to carefully read this installation manual and the separate user's manual
so that you can use the product correctly. Alpine Electronics bears no responsibility for problems that arise as
a result of failure to follow the instructions in the manuals.
This manual includes a number of symbols that are intended to help you use the product safely, to prevent
harm to you and others, and to protect against damage to property. These symbols and their meanings are
listed below. Make sure you fully understand these symbols before you begin reading the main text.
Explanations of Injury and Damage That May Result from Incorrect Use
Warning
Caution
Ignoring the content marked by this indication and using the product incorrectly is
expected to lead to death or serious injury.
Ignoring the content marked by this indication and using the product incorrectly is only
expected to lead to injury or property damage.
Types of Precautions
Chevrolet/GMC
FULL SIZE TRUCK 2/14
Forbidden
Forbidden
Indicates actions that are forbidden
(must not be performed)
Mandatory
Indicates that disassembly is
forbidden.
Indicates actions that are
mandatory (must be performed)
Marks content that should receive
your full attention.
Warning
Do not disassemble or modify the product. Doing so could lead to an accident, re,
or electric shock.
Forbidden
Store screws and other small objects where small children cannot reach them. If one of these
small objects is swallowed, consult with a doctor immediately.
When replacing fuses, be sure to use fuses with the specied current rating. Failing to do so could
lead to an accident or re.
Forbidden
Mandatory
Only connect the product to a 12 VDC negative ground car. Failing to do so could lead to
an accident or re.
Before you begin wiring, remove the ground wire from the negative terminal of the battery.
Failing to do so could lead to electric shock or injury.
Do not cut the insulation on a cord and take power from another device. Doing so could
lead to re or electric shock.
Do not install the product in a location where it will obstruct the driver’s forward view;
interfere with the operation of the steering wheel, gearshift, or the like; or pose a
threat to passengers. Doing so could lead to an accident or injury.
Mandatory
Forbidden
Forbidden
Chevrolet/GMC
FULL SIZE TRUCK 3/14
When making a hole in the vehicle body, be careful to avoid damaging pipes, the fuel tank,
electrical wiring, and the like. This kind of damage could lead to an accident or re.
When installing and grounding the product, do not use any of the bolts or nuts of the
steering wheel, brakes, fuel tank, or the like. Doing so could make the brakes stop working
or lead to re.
Do not install the product near the passenger-side airbag. Doing so could interfere with the
operation of the airbag and lead to an accident or injury.
Bundle cords so that they don’t interfere with driving. Wrapping cords around the steering
wheel, gearshift, brake pedal, or the like, could lead to an accident or damage equipment.
Forbidden
Forbidden
Caution
Connect the product properly according to the instructions. Failing to do so could lead
to re or an accident.
Do not sandwich cords between the seat railing or allow them to touch protrusions.
Resulting breaks or shorts could lead to electric shock or re.
Do not block vents or heat sinks. Doing so could lead to re or damage equipment.
Use the accessories according to the instructions, and attach them securely.
Failing to do so could lead to an accident or damage equipment.
Do not install the product where it may be exposed to water or in a place with high levels
of humidity or dust. Doing so could lead to re or damage equipment.
Forbidden
Forbidden
Forbidden
The installation and wiring of this product requires specialized skills and experience.
Have the product installed and wired by an authorized Alpine dealer.
Accessory List
SPT-10T (Front Speaker Kit)
1” Tweeter (2 pcs)
SPT-30M (Front Speaker Kit)
3” Midrange (2 pcs)
Chevrolet/GMC
FULL SIZE TRUCK 4/14
SPT-80W (Front Speaker Kit)
8” Woofer (2 pcs) Foam Gasket (2 pcs)
SPT-70 (Rear Speaker Kit)
6-1/2” Coaxial Speakers (2 pcs) 4 x 30mm Screws (8 pcs)
ALP-31GM-POD (Front Dash Pod Kit)
Tweeter Pod Assembly
(2 pcs)
Tweeter Pod Template
(1 pc)
8-16 x 3/8” Screws
(10 pcs)
Washers (10 pcs)
Chevrolet/GMC
FULL SIZE TRUCK 5/14
ALP-31GM-MBKT (Front Dashboard Speaker Bracket Kit)
Midrange Speaker Adapters (2 pcs) #4 x ½” Screws (8 pcs)
ALP-31GM-SB-SP (Speaker Wire Harness Adapters and Rear Door Speaker Bracket Kit)
Rear Speaker Adapters (2 pcs) Harness Adapters (6 pcs) Cable Ties (8 pcs)
ALP-31GM-WBKT (Front Door Speaker Bracket Kit)
Woofer Speaker Adapters (2 pcs) #10 x 1” Screws (8 pcs)
RL
ALP-31GM-NW (3-Way Speaker Crossover GM)
Woofer Crossover (2 pcs) Tweeter and Midrange
Crossover (2 pcs)
Installation Manual & Warranty
Card
Component Locations
Tweeter (SPT-10T)
Midrange (SPT-30M)
Woofer
(SPT-80W)
Chevrolet/GMC
FULL SIZE TRUCK 6/14
Coaxial
Speaker
(SPT-70)
Front Door Panel Removal
Chevrolet/GMC
FULL SIZE TRUCK 7/14
1 Remove the door handle cover and extract 1 x 7mm
bolt.
2 Remove the door trim and extract 1 x 7mm bolt.
3 Remove the arm rest cover and extract 2 x 7mm
bolts.
1
3
2
4
4 Extract the 2 x 7mm screws at the bottom of the
door panel.
6 Press the clip and pull to release the cable ball from
the door panel.
7 Unplug the window switch from the back of the door
panel.
8 Remove the panel completely and set aside.
5 Remove the door panel using a panel removal tool.
Please note clip locations below.
Chevrolet/GMC
FULL SIZE TRUCK 8/14
Factory Speaker Removal (Front Door)
1 Remove the factory speaker held by 1 x 7mm screw.
Retain the original screw for the new speaker replacement.
2 Unplug the speaker connector from speaker.
Front Speaker Installation
1 Connect the door speaker wire harness adapter to
WF network.
Door Speaker
Wire Harness
Adapter
WF Network
Woofer
2 Mount the WF Network to the bottom rear tab using
the cable tie.
3 Apply foam gasket to the rear of the SPT-80W
(Woofer).
4 Mount SPT-80W (Woofer) to the ALP-31GM-WBKT
(Front Door Speaker Bracket Kit) with wire terminals
at the bottom using 4 x 30mm screws.
5 Connect the network output wires to the speaker
terminals. Bundle the cable up and secure using
cable tie. Cut extra cable tie length.
FULL SIZE TRUCK 9/14
Rear Door Panel Removal
Chevrolet/GMC
6 Connect the door speaker wire harness adapter to
factory speaker plug.
7 Mount the factory speaker plug to the upper
mounting tab of the bracket.
8 Attach the speaker to the door by inserting the
bottom tab first, then use original 7mm bolt to
secure.
Ensure that the excess wires do not interfere with
door or window components.
1 Remove the door handle cover and extract
1 x 7mm bolt.
2 Remove the arm rest cover and extract 2 x 7mm
bolts.
3 Remove 1 x 7mm bolt at the bottom of the door
panel.
1
2
3
9 Install the door panel using the reverse procedures.
10 Repeat the process for the other door panel.
4 Remove the door panel using a panel removal tool.
Please note clip locations below
Chevrolet/GMC
FULL SIZE TRUCK 10/14
Factory Speaker Removal (Rear)
5 Press the clip and pull to release the cable ball from
the door panel.
6 Unplug the window switch from the back of the
door panel.
7 Remove the panel completely and set aside.
1 Remove the factory speaker held by 1 x 7mm
screw.
Retain the original screw for the new speaker replacement.
2 Unplug the speaker connector from speaker.
Chevrolet/GMC
FULL SIZE TRUCK 11/14
Rear Speaker Installation
1 Connect the door speaker harness adapter to the
factory speaker plug.
Factory
Speaker Plug
Door Speaker
Harness Adapter
2 Bundle the cable up and secure using a cable tie.
3 Cut extra cable tie length.
4 Mount SPT-70 to the speaker adapter with terminals
at the bottom using 4 x 30mm screws.
Factory A-Pillar Panel
1 Remove the A-Pillar cover.
There are slight differences between model year vehicles and
options.
3
2
4
5 Attach the speaker connectors to the speaker
terminals.
6 Attach the speaker to the door by inserting the
bottom tab first, then use original 7mm bolt to
secure.
Ensure you do not pinch or have the excess wire hanging inside
the door panel causing binding of the window when rolled down.
7 Install the door panel using the reverse procedures.
8 Repeat the process for the other door panel.
2 Remove the A-Pillar screw cover plate.
3 Extract 2 x 10mm bolts (Passenger Side).
4 Remove the A-Pillar. Carefully unhook the tether clip
behind the A-pillar near the top. (Driver Side)
Tether clip MUST be replaced every time the
A-Pillar is removed
Upper Dashboard Removal
Chevrolet/GMC
FULL SIZE TRUCK 12/14
1 Use a panel removal tool to disengage the clips of
the upper dashboard trim panel. Remove the panel.
Some models may have a sensor attached.
Carefully remove the sensor by twisting
counterclockwise.
2 Cut the excess plastic underneath the panel ( as
shown below).
6 Install the SPT-10T into the tweeter pod assembly.
7 Align the tweeter pod with the holes and mount
using (5 pcs) 8-16 x 3/8” screws and washers.
Repeat Steps 4– 6 for the other side using the
same template.
3 Align the template on the upper trim panel speaker
grills.
4 Mark the holes and area that needs to be cut out.
5 Using a cutting tool, cut out the template and use a
5/16 (8mm) drill to cut the holes.
8 Repeat for steps for other side.
9 Set upper dashboard trim panel aside and
continue to midrange speaker installation.
Midrange Speaker Installation
1 Remove the factory speaker 2 x 7mm screws then
unplug the factory harness.
2 Connect the networks to the dashboard speaker wire
harness adapter.
Chevrolet/GMC
FULL SIZE TRUCK 13/14
6 Secure the MID network and wires with included
zip ties. Set aside the tw network cable to connect
later.
Ensure that the network and wiring do not pinch
or interfere with any factory parts.
7 Mount midrange bracket in the factory location
using the 2 x 7mm screws.
3 Carefully mount the SPT-30M to ALP-31GM-MBKT
(Front Dashboard Speaker Bracket Kit) using the
screws provided.
4 Connect the dashboard speaker wire harness
adapter to the factory speaker plug.
TW Network
Dashboard
Speaker Wire
Harness
Adapter
MID Network
Tweeter
Midrange
5 Connect the MID network output wires to the
SPT-30M speaker terminals. Route the midrange
speaker adapters to the factory location.
Upper Dashboard Panel Installation
1 Connect the TW network output wires to the
SPT-10T speaker leads.
Ensure you do not pinch the excess wire under the upper
dashboard panel.
2 Secure the TW network and wires with included zip
ties.
Ensure that the network and wiring do not pinch or interfere
with any factory parts.
3 Install in reverse order
- Upper Dashboard Trim Panel and sensor ( if
equipped)
- A-pillars
4 Install the A-pillar using the reverse procedure and
ensure the excess tweeter wires are not exposed.
Tighten the handle to 6Nm (53lb/in)
5 Repeat the process for the other A-Pillar.
Chevrolet/GMC
FULL SIZE TRUCK 14/14
If there are any questions about the installation
process please call Alpine Technical Support
1-800-ALPINE-1 (1-800-257-4631)
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