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ALPINE Sound System for 2007-14 GM trucks and SUVs (SPT21GM)


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ALPINE Sound System for 2007-14 GM trucks and SUVs (SPT21GM)

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 or SUV? Well, Alpine's done it. Their phenomenal Restyle line, which started with custom-fit navigation receivers, now includes everything-you-need speaker packages. Upgrading the audio in your GM just got a heck of a lot simpler.

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Oh, the sound

The beauty of Alpine's SPT-21GM speaker system is that it's one-stop shopping. You'll get a 6-1/2" component system for the front of your truck or SUV, featuring two 1" tweeters with built-in crossover systems for cleaner highs. Alpine also gives you a pair of 6-1/2" full-range speakers for the rear factory locations. With power handling up to 80 watts RMS, this system will really rock whether you're using a factory radio, an aftermarket car stereo, or an outboard amplifier to power it.

The chameleons

Alpine designed the Restyle line for drivers who want to improve their sound but want to maintain the factory look of their vehicle. The SPT-21GM 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-21GM system goes in, you won't even know it's there... until you crank up the volume.

Note: The Alpine SPT-21GM speaker system is not compatible with Bose-equipped factory systems.


-includes two 6-1/2" component woofers, two 1" tweeters, two 6-1/2" full-range speakers, custom tweeter housings, woofer installation brackets, and connectors

-in-line high-pass crossover networks built into component tweeters

-power range (front and rear speakers): 2-80 watts RMS (240 watts peak power)

-replaces front and rear speakers

-warranty: 3 years


Features and Specs

Speaker Size Vehicle-specific
Design ---
Tweeter Design 1" Dome
Impedance (Ohms) 4
Tweeter Composition Silk
Woofer Composition Poly-Mica
Woofer Surround Rubber
Parts Warranty 3 Years
Labor Warranty 3 Years
Sensitivity (1W at 1 meter) N/A
Sensitivity at 2.83 volts N/A
Frequency Response 70 - 22k Hz
Minimum RMS Wattage 2
Maximum RMS Wattage 80
Peak Power Handling (Watts) 240
Top-mount Depth (Inches) 2 1/4
Bottom-mount Depth (Inches) N/A
Cutout Diameter or Length (inches) 5