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Alpine SPT-21GM

2-Way Direct Fit Restyle Speaker System for Select GM Trucks and SUVs

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Alpine SPT-21GM

2-Way Direct Fit Restyle Speaker System for Select GM Trucks and SUVs

$649.95

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General Features:

  • Direct Fit Restyle Speaker System
  • Compatible with select 2007-2013 GM Trucks and 2007-2014 SUVs
  • CEA 2031 Speaker Rating:
    • 240 Watts Peak, 80 Watts RMS System
  • Utilizes all factory speaker locations
  • All installation hardware such as speaker adapters and hardware included
  • System consists of:
    • 2-Way component speaker set for the front doors/ dash
    • Coaxial speakers for the rear doors
  • Embossed Alpine logo tweeter housing
    • Provide optimized sound imaging and clarity
  • Authorized Internet Dealer
  • 1-year Sonic Electronix Warranty

Speaker Features

  • SPT-21 GM Speaker system
    • (2) 6.5" drivers for the front doors
    • (2) 6.5" coaxial rear door speakers
    • (2) 1" silk dome tweeters + tweeter housing

Vehicle Compatibility

  • Chevrolet
    • 2007 - 2013 Silverado (Crew Cab only)
  • GMC
    • 2007 - 2013 Sierra (Crew Cab only)


Note: Not compatible with Bose factory sound systems. Also some vehicles may require custom tweeter installation.

Speaker Package Features

Compatible Vehicle Make
Allows you to view only items that are compatible with your vehicle's make. Does not guarantee that it will work with your vehicle year or model.
Chevrolet
GM

Front Speaker Specifications

Design
The number of individual drivers in a car speaker. Speakers with 2 drivers are known as a 2-way, and 3 drivers are known as a 3-way. Component systems are often referred to as "separates" because the tweeter is not attached to the midwoofer (main speaker driver) and mounts separately in a location such as a door post. Component systems typically come with an external crossover so you can easily adjust the high and low frequencies sent to both the midwoofer and the tweeter. Center channel speakers are great for those looking to have surround sound in their vehicle.
2-way Component System
Tweeter Design
Designs such as cone, dome, semi-dome, balanced dome, and whizzer are most popular. Cone tweeters are simple, efficient and typically are the most reasonably priced. Dome tweeters are used in most home speakers, and provide a smoother and more accurate sound. Semi-dome design is one with a dome placed inside a cone. A Balanced dome driver is a semi-dome with equal reproduction area given the cone and dome portions of the driver. A whizzer tweeter is a separate tweeter cone driven by the voice coil of the woofer.
Dome
Tweeter Composition
Materials such as polypropylene, silk, cloth, and paper are the most common, where as many more recent tweeters are now manufactured with composites such as Aluminum, Titanium, Mylar, and other materials.

PEI is an acronym for "Polyetherimide" which is an amorphous, amber transparent, high-performance thermoplastic.

Silk
Woofer Composition
Lightweight woofer cone materials are essential for efficient operation. Poly cones produce exceptional sound and are sturdy against various changes in temperature. Paper cones are very efficient, and when treated for moisture resistance, will perform at a high level. Poly refers to polypropylene, which is thermoplastic or fibers that are polymers of propylene. IMPP refers to injection molded polypropylene, a commonly used process and material in speakers.
Polypropylene
Speaker Size
Refers to the size of the speaker measured in inches. Every vehicle has standard application sizes. Please use our vehicle fitment guide for your vehicle's specific speaker sizes if you do not know them.
6-1/2"

Rear Speaker Specifications

Design
The number of individual drivers in a car speaker. Speakers with 2 drivers are known as 2-way, 3 drivers = 3-way and so forth. Component systems are often referred to as "separates" because the tweeter is not attached to the midwoofer (main speaker driver) and mounts separately in a location such as a door post. Component systems typically come with an external crossover so you can easily adjust the high and low frequencies sent to both the midwoofer (main driver) and the tweeter. Center channel speakers are great for those looking to capture true surround sound in their car.
2-way
Woofer Composition
The woofer cone material is essential for efficient operation. Poly cones produce exceptional sound and are sturdy against various changes in temperature. Paper cones are very efficient, and when treated for moisture resistance, will perform at a high level. Poly refers to polypropylene: thermoplastic plastics or fibers that are polymers of propylene. IMPP refers to injection molded polypropylene, a commonly used process and material in speaker manufacture.
Mica Injected Polypropylene (MIPP)
Speaker Size (Rear)

Refers to the size of the speaker.

Every vehicle has standard application sizes. Please contact us for your vehicle's specific speaker sizes if you do not know them.

6-1/2"

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Sonic Electronix

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Product Summary

Manufacturer

Model Number

SPT-21GM

UPC

793276210890

Weight

12.50lbs

Internal SKU

spt21gm

Internal Product ID

125367

Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Alpine SPT-21GM