Contact us
Close contact box

Alpine SPT-31GM

Direct-fit front and rear speaker system for select 2014-up GM trucks

Item # 500SPT31GM

How great would it be if someone took the guesswork out of installation and offered a top-notch speaker system...

Find what Fits your car

How great would it be if someone took the guesswork out of installation and offered a top-notch speaker system...

Discontinueditem
4 questions - 8 answers

Item # 500SPT31GM

About the Alpine SPT-31GM

Alpine takes your GM truck seriously

How great would it be if someone took the guesswork out of installation and offered a top-notch speaker system perfectly suited for your GM truck? Well, Alpine's done it. Their phenomenal Restyle line, which started with custom-fit navigation receivers, now includes speaker packages. Upgrading the audio in your GM truck just got a heck of a lot simpler.
Alpine Authorized Online Dealer

Alpine takes your GM truck seriously

How great would it be if someone took the guesswork out of installation and offered a top-notch speaker system perfectly suited for your GM truck? Well, Alpine's done it. Their phenomenal Restyle line, which started with custom-fit navigation receivers, now includes speaker packages. Upgrading the audio in your GM truck just got a heck of a lot simpler.

Deluxe sound

Alpine's SPT-31GM speaker system gives you a powerful 3-way component system, featuring two 8" polypropylene woofers for a hefty bass, 3" polypropylene drivers for more articulate midrange, and 1" silk dome tweeters with built-in crossover systems for cleaner highs. With power handling up to 90 watts RMS, this system will really rock whether you're powering it with a factory radio, an aftermarket car stereo, or an outboard amplifier. Alpine also includes a pair of 6-1/2" coaxial speakers for your truck's rear factory locations.

Blend it in

Alpine designed the Restyle line for drivers who want to improve their sound while maintaining the factory look of their vehicle. The SPT-31GM speaker system upholds this approach by giving you streamlined tweeter housings that match the style of your GM interior. Mounting brackets are also included for fitting the system's woofers into the factory speaker locations and using the factory grilles. Once the SPT-31GM system goes in, you won't even know it's there... until you crank up the volume.

READ LESS

Product highlights:

  • custom-designed audio package for select GM trucks
  • package includes:
    • two 8" component polypropylene woofers
    • two 3" midrange drivers
    • two 1" silk dome tweeters
    • two 6-1/2" full-range polypropylene-mica speakers for the rear
    • includes custom tweeter housings, woofer installation brackets, and connectors
  • in-line high-pass crossover networks built into component tweeters
  • front speaker power range: 2-90 watts RMS (270 watts peak power)
  • rear speaker power range: 2-80 watts RMS (240 watts peak power)
  • front frequency range: 58-22,000 Hz
  • rear frequency range: 70-22,000 Hz
  • replaces front and rear speakers
  • warranty: 3 years
  • Our 60-day money-back guarantee
  • MFR # SPT-31GM
KEEP READINGREAD LESS

What's in the box:

  • This package contains nine individually boxed Alpine items along with an installation guide and warranty information:
  • SPT-80W Front door woofers:
  • Two 8" woofers
  • Two 26" foam gasket strips w/adhesive backing
  • SPT-30M Dash mid-drivers:
  • Two 3" mid-range drivers
  • SPT-10T Dash tweeters:
  • Two 1" dome tweeters with 30" of attached wire
  • SPT-70 Rear door speakers:
  • Two 6-1/2" coaxial speakers
  • Eight 1-1/8" Phillips-head screws
  • ALP-31GM-NW Crossover set:
  • Two mid/tweeter crossovers (pre-attached to each other) w/attached input and output wires
  • Two woofer crossovers w/attached input and output wires
  • ALP-31GM-WBKT Door woofer brackets:
  • Two speaker brackets
  • Eight 1" Phillips-head screws
  • ALP-31GM-POD Tweeter pods:
  • 2 Tweeter pod assemblies
  • 1 Tweeter pod template
  • Ten 3/8" Phillips-head screws
  • Ten flat-washers
  • ALP-31GM-MBRKT Midrange dash bracket:
  • 2 Midrange speaker adapters
  • Eight 1/2" Phillips-head screws
  • ALP-31GM-SB-SP Speaker installation accessory kit:
  • 2 Rear speaker mounting brackets
  • 6 Speaker adapter harnesses
  • Ten 7" wire-ties

Customer reviews

Loading reviews...

Alpine SPT-31GM reviews

Average review:

2 reviews

Filter by rating

Customer photos

Sort reviews

Sort by:
Items per page:
View page:

Awesome Sound

Crutchfield customer from Waco, TX on 4/25/2018

2016 Chevrolet Silverado 1500

Verified customer (What's this?)
Verified employee purchase (What's this?)

I love the sound of my new Speakers. I would turn up my factory speakers and think ok lets keep em turned down they sound like crap if they get to loud but, with my new Alpine SPT-31GM speakers I turn it up and it feels amazing to hear good clear sound. These speakers were definitely worth the money and I would recommend the speaker restyle to anyone. I installed them myself and went right in without any problems.

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Very clean sound ..

Paul from Las Vegas, NV on 10/12/2017

2016 GMC Sierra 1500

Verified customer (What's this?)
Verified employee purchase (What's this?)

Great system sounds great ... Looks even better.

Pros: Sounds great

Cons: Install takes awhile.

Crutchfield response on
Customer review photo

5 of 6 found this helpful

Verified customer (What's this?)
Verified employee purchase (What's this?)

Pros:

Cons:

Crutchfield response

<< >>

More details on the Alpine SPT-31GM

Pat M.

Features & specs

General
Speaker Size Vehicle-specific
Design 2-way
Tweeter Design Dome
Impedance (Ohms) ---
Tweeter Composition Silk
Woofer Composition Polypropylene
Woofer Surround Rubber
Parts Warranty 3 Years
Labor Warranty 3 Years
Specifications
Sensitivity (1W at 1 meter) N/A
Sensitivity at 2.83 volts N/A
Frequency Response ---
Minimum RMS Wattage ---
Maximum RMS Wattage 80
Peak Power Handling (Watts) 240
Top-mount Depth (Inches) N/A
Bottom-mount Depth (Inches) N/A
Cutout Diameter or Length (inches) ---

Product Research

Features

Overview: Part of Alpine's Restyle speaker line, the SPT-31GM speaker upgrade kit is designed for select 2014 and up Chevrolet Silverado and GMC Sierra trucks (Double Cab and Crew Cab models only, not compatible with factory Bose systems). The upgrade kit includes 6-1/2" coaxial speakers for the rear doors, 8" woofers for the front doors, along with 3" midranges and 1" tweeters for the dash location. The SPT-31GM speaker system can handle up to 80 watts RMS and 240 watts peak power, and includes all necessary mounting hardware.

Door Woofers: Included for the front doors are a pair of Alpine SPT-80W woofers that are part of the 3-way speaker system for the front of the vehicle, providing punchy solid bass. Wiring adapter harnesses, for adapting into the factory wiring, are provided along with inline low-pass crossovers. Mounting brackets and hardware are included for installation.

Dash Midrange/Tweeters: The SPT-31GM speaker kit includes a pair of SPT-30M 3" midrange drivers and SPT-10T 1" silk dome tweeters for the dash location. The included ALP-31GM-POD tweeter pods are designed to relocate the new tweeters from the "A" pillars to the dash, as well as provide a new speaker grill for the mid-drivers, which re-use the factory location. The tweeter pod's shape and mounting location are optimized for the best sound imaging and clarity. A template is included for installing the tweeter pods on top of the factory mid-speaker grills. Note: Drilling and cutting the factory grill is required for installation! Crossovers, for both the mid-drivers and tweeters, are provided along with speaker wiring harnesses that adapt directly into the factory wiring.

Rear Doors: A pair of SPT-70 2-way speakers are provided for the rear door location. These also include their own mounting brackets along with wiring harnesses to adapt directly to the factory wiring.

Loading accessories...

Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
I plan on doing this install myself (I installed my Restyle dash unit as well), but I really wasn't looking to install amps and a powered sub, so it's nice that Alpine offers both the SPT-31GM for those like me, or the PSS-31GM for those that want the extra boom. I saved $1000, and I really only got what I was looking to replace. Alpine DOES NOT sell the mid-range dash speakers by themselves only in this set or the PSS-31GM. Full disclosure: You do have to cut a very small portion of your dash. [ William  May 02, 2018 ]
A
Specifically fits my vehicle. [ Ron  Feb 24, 2018 ]

4 questions already asked

Q
How much cutting is required? Will I need to add a sub or do the 8 in speakers offer a good boom I like bass but it doesn't have to rattle the whole car? Thank you
[ Ty2183672360912  May 17, 2018 ]
1 answer
A
You can check to see if this will fit your vehicle by using our Outfit My Car tool: http://www.crutchfield.com/car/carselector.aspx For additional details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle.
[ Krissy  Jun 03, 2018 ]  Staff
Q
Does this system replace all the speakers through the truck?
[ Kasey  Mar 11, 2018 ]
3 answers
A
Yes... and it sounds.great!
[ paul  Mar 11, 2018 ]
A
Yes they do replace all the speakers in the truck. They sound great to
[ mike  Mar 11, 2018 ]
A
Yes it does. It is all plug and play no modifications required. It even adds a tweeter to the dash along with the 3.5 dash speaker.
[ Kevin  Mar 11, 2018 ]
Q
Does this work with the Bose equipped trucks?
[ Stacy  Sep 28, 2017 ]
2 answers
A
yes but you have to buy an extra adapter from alpine cost around 400 dollars for the adapter
[ mike  Mar 12, 2018 ]
A
You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility with your factory system. They will be able to pull up your vehicle and see if this will integrate. If it does not, then they will also be able to discuss other options with you.
[ Kenny  Sep 30, 2017 ]  Staff
Q
Does this speaker system replace getting subs?
[ Nubby  Feb 19, 2017 ]
2 answers
A
I have the alpine x110-slv with the spt-31 gm speakers. I added the alpine ktp-445 mini amp for alpine radios. I also added the alpine sbr-s8-4 * inch sub that fits under the rear seat. I used a JL audio mx300/1 mini amp for the sub. It sounds pretty good in my truck and takes very little space.
[ mike  Mar 12, 2018 ]
A
No, especially since it's being powered by the head unit.
[ JASON  Feb 20, 2017 ]

Loading articles...

TOP