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2019 GMC Sierra 1500
Your 2019 GMC Sierra 1500 comes stock with a replaceable head unit and full-range door speakers covering front and rear — no amp, no sub. That's the right starting canvas for a full build, because nothing is locked out. With a premium budget and the install in your own hands, do it all at once: a new head unit, component or coaxial upgrades for the front 6x9 doors and A-Pillar tweeters, fresh rear 6.5s, a subwoofer in a custom enclosure built to fit your truck's cab (under or behind the rear seat is the practical zone), and a proper multi-channel amplifier — or a pair — sized to power every speaker plus a dedicated mono channel for the sub. Your truck's cab is a sealed-enough acoustic space that when everything is properly powered and crossed over, the difference is immediately apparent.
The upgrade path
4 steps · ordered by impact · with DIY difficultyYour 2019 GMC Sierra 1500's double-DIN opening is the right starting point for a full system build — it means a direct head-unit swap with no fabrication. Since there's no factory amplifier, the head unit's preamp outputs go straight to your amp, so the quality of those outputs matters: look for a head unit with multiple preamp outputs at 4V or higher to feed front, rear, and sub channels cleanly. A vehicle-specific installation kit from Metra or Scosche covers the dash fit and wiring harness. Make sure the kit includes a steering-wheel control interface if your 2019 GMC Sierra 1500 uses those buttons — losing them on a daily driver is a real inconvenience, and retaining them is a straightforward addition.
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A full system build in your 2019 GMC Sierra 1500 starts with the front stage — and with a premium budget and no factory amplifier to work around, you can do it right the first time. The front doors take 6x9s; pair them with a component set so the tweeters handle the high-frequency detail separately from the woofer. That matters most on a truck because the front doors are lower and further back than in most cars — component tweeters mounted higher in the A-pillar or dash bring the soundstage forward and up where it belongs. Swap the rear pillar 4x6s at the same time; at this budget there's no reason to leave them stock. The whole front and rear speaker change happens now so the amplifier and sub can be sized to drive a complete, known speaker load. See the Best Car Speakers by Size guide for size-matched picks.
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A full system build in a truck starts with the physical reality: no trunk, so the subwoofer lives in the cab — under or behind the rear seat in an enclosure built to that sub's specs. A shallow or compact sub is designed for exactly this constraint; the box tuning is what separates controlled, musical bass from a muddy cabinet resonance. Because you're doing the install yourself on a premium budget, build this step the right way — a proper subwoofer, a custom enclosure, and a dedicated amplifier. That combination integrates with the upgraded front and rear speakers you're already running to deliver a cohesive, full-range sound in your truck's cab. See the Best Slim / Shallow Subwoofers guide for truck-friendly picks.
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With no factory amplifier in the 2019 GMC Sierra 1500, everything downstream depends on what you add here. For a full system build — speakers across all zones plus a subwoofer — the amplifier (or amplifiers) is the core of the system. Head-unit power isn't designed to run more than a basic speaker pair cleanly; adding a dedicated aftermarket amp with proper gain staging is what makes the speakers and sub sound like a system rather than a collection of parts. Size the amp to one channel per speaker zone plus a mono channel for the sub; a single large multi-channel amp or a multi-channel paired with a mono sub amp both work. With a replaceable double-DIN head unit, the preamp outputs feed the amp directly — clean and simple.
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2019 GMC Sierra 1500 audio — common questions
What size speakers fit a 2019 GMC Sierra 1500?
The 2019 GMC Sierra 1500 uses 6×9 + tweeter front speakers and 4×6 rear speakers.
Does the 2019 GMC Sierra 1500 have a factory amplifier?
No factory amp — the 2019 GMC Sierra 1500 drives its speakers off the head unit, so adding a compact 4-channel amp later gives the new speakers clean, properly rated power.
What is the best subwoofer setup for a 2019 GMC Sierra 1500?
No trunk, so bass lives in the cab — a shallow/compact sub fits under or behind the rear seat, or in a truck-specific enclosure.
What head unit fits a 2019 GMC Sierra 1500?
The 2019 GMC Sierra 1500 has a Double DIN head unit (Replaceable — direct swap), so a matching aftermarket receiver fits with the correct dash kit and harness.
Everything on CarAudioNow for your 2019 GMC Sierra 1500
Fitment is a guide, not a guarantee. Speaker sizes and fit details are based on your selected year, make, model, and audio package and can vary by trim, options, and prior modifications — always confirm before buying.
Your plan is guidance built from your selections (vehicle, goal, budget), not a guarantee of fit, sound, or results, and not a substitute for professional installation advice. Prices are pulled from retailers and may change at checkout.
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