Alpine SPT-21GM User manual

Chevrolet/GMC
FULL SIZE TRUCK & SUV  1/12
SPT-21GM
Speaker System for Chevrolet/GMC
Installation Manual
 Model: Select GM Trucks and SUVs
 Model Year: Truck (2007-2013)/SUV (2007-2014)
 Trim Level: NON-BOSE Systems
Introduction
Design and specications 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 the store that you purchased it from.
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 Ignoring the content marked by this indication and using the product incorrectly is
expected to lead to death or serious injury.
Caution Ignoring the content marked by this indication and using the product incorrectly is only
expected to lead to injury or property damage.
CHEVROLET
Model Year
AVALANCHE 2007 - 2013
SILVERADO 2007 - 2013
2500HD 2007 - 2013
3500HD 2007 - 2013
SUBURBAN 2007 - 2014
TAHOE 2007 - 2014
GMC
SIERRA 2007 - 2013
2500HD 2007 - 2013
3500HD 2007 - 2013
YUKON 2007 - 2014
YUKON XL 2007 - 2014
* The specied vehicles have been tested and have met compatibility specs 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.

Chevrolet/GMC
FULL SIZE TRUCK & SUV  2/12
Types of Precautions
Forbidden
Indicates actions that are forbidden
(must not be performed)
Mandatory
Indicates actions that are
mandatory (must be performed)
Forbidden
Indicates that disassembly is
forbidden.
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 specied 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.
Mandatory
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.
Forbidden
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. Forbidden

Chevrolet/GMC
FULL SIZE TRUCK & SUV  3/12
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. Forbidden
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.
Forbidden
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.
Caution
Connect the product properly according to the instructions. Failing to do so could lead
to re or an accident.
Forbidden
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.
Forbidden
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
The installation and wiring of this product requires specialized skills and experience.
Have the product installed and wired by the store that you purchased it from.

Chevrolet/GMC
FULL SIZE TRUCK & SUV  4/12
Accessory List
Speaker Parts
Front Door Component
Speakers SPT-70C
Rear Door Coaxial Speakers
SPT-70
A-Pillar Tweeter Pod w/Tweeter
Installed
Installation Kit Parts
Door Speaker Adapters (4 pcs) Door Speaker Harness Adapter
(4 pcs)
A-Pillar Tweeter Harness
Adapter (2 pcs)
Tweeter Crossover Network
(2 pcs)
4x 30mm Screws (16pcs) Tweeter Mounting Hardware
(4 sets)
Cable Ties (8 pcs) Installation Manual

Chevrolet/GMC
FULL SIZE TRUCK & SUV  5/12
Component Locations
Component
Speaker Rear Door
Coaxial
Speaker
A-Pillar Tweeter Pod

Chevrolet/GMC
FULL SIZE TRUCK & SUV  6/12
Front Door Panel Removal
1 Remove the door handle cover.
2 Extract 2 x 10mm bolts and remove handle.
3 Remove the screw cover behind the door release
handle.
4 Extract 1 x 10mm bolt.
5 Remove the interior side mirror cover plate.
2
5
4
3
1
6 Remove the manual door latch release using a panel
tool to disengage the release tab.
7 Pull off the manual door latch release knob.
6
7
8 Remove the window switch assembly.
9 Unplug the electrical connectors from window
switch assembly.
10 Remove the door panel using a panel removal tool.
 Pleasenotecliplocationsbelow.

Chevrolet/GMC
FULL SIZE TRUCK & SUV  7/12
11 Detach the door latch release cable, press the
retaining clips towards each other to disengage the
cable from the housing.
12 Release the cable ball end from the retainer.
13 Remove the panel completely and set aside.
Factory Speaker Removal (Front)
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.
Cable Ball
End

Chevrolet/GMC
FULL SIZE TRUCK & SUV  8/12
Front Speaker Installation
1 Connect the door speaker harness adapter to the
factory speaker plug.
2 Bundle the cable up and secure using a cable tie.
3 Cut extra cable tie length.
4 Mount SPT-70C to the speaker adapter with wire
terminals at the bottom using 4 x 30mm screws.
5 Attach the speaker connectors to the speaker
terminals.
6 Attach the speaker to the door by inserting the
bottom tab rst, 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.
Rear Door Panel Removal
1 Remove the door handle cover plate.
2 Remove 2 x 10mm bolts.
3 Remove the cover plate behind the door release
handle.
4 Remove 1 x 10mm bolt.
5 Remove the window controls using a panel removal
tool.
2
4
1
3
5
6 Remove the manual door latch release using a panel
tool to disengage the release tab.
7 Pull off the manual door latch release knob.
6
7
Factory
Speaker Plug
Door Speaker
Harness Adapter

Chevrolet/GMC
FULL SIZE TRUCK & SUV  9/12
8 Remove the window switch assembly.
9 Unplug the electrical connectors from window
switch assembly.
10 Remove the door panel using a panel removal tool.
 Pleasenotecliplocationsbelow
11 Detach the door latch release cable, press the
retaining clips towards each other and disengage
the cable from the housing.
12 Release the cable ball end from the retainer.
13 Remove the panel completely and set aside.
Cable Ball
End

Chevrolet/GMC
FULL SIZE TRUCK & SUV  10/12
Factory Speaker Removal (Rear)
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.
Rear Speaker Installation
1 Connect the door speaker harness adapter to the
factory speaker plug.
2 Bundle the cable up and secure using a cable tie.
3 Cut extra cable tie length.
4 Mount SPT-70C to the speaker adapter with
terminals at the bottom using 4 x 30mm screws.
5 Attach the speaker connectors to the speaker
terminals.
6 Attach the speaker to the door by inserting the
bottom tab rst, 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.
Factory
Speaker Plug
Door Speaker
Harness Adapter

Chevrolet/GMC
FULL SIZE TRUCK & SUV  11/12
Factory A-Pillar Panel Removal
1 Remove the A-Pillar cover.
 Thepassengersidehasagrabhandle.
23
23
2 Remove the A-Pillar screw cover plate.
3 Extract 1 x 7mm bolt (Driver Side). Extract 2 x 10mm
bolts (Passenger Side).
4 Remove the A-Pillar and unplug the tweeter
connector.
Tweeter Pod Installation
1 Remove the factory tweeter by releasing the tabs on
the back of the A-pillar.
2 Mount the tweeter pod using the provided washers
and screws.
3 Connect the network to the tweeter.
4 Connect the network to the tweeter harness
adapter.
5 Connect the tweeter harness adapter to the factory
speaker plug.
6 Secure the network and wires with included zip ties
 Ensurethatthenetworkandwiringdonotpinchor
interferewithanyfactorycomponents.
To Tweeter To Tweeter
Harness
Adapter
Network

Chevrolet/GMC
FULL SIZE TRUCK & SUV  12/12
7 Install the A-Pillar using the reverse procedures.
 Ensuretheexcesstweeterwiresarenotexposed.
PassengersideA-Pillar
DriversideA-Pillar
8 Repeat the process for the other A-Pillar.