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2013 GMC Sierra 1500
The 2013 GMC Sierra 1500 offers a genuine blank canvas for a premium build: no trunk, no factory subwoofer, and no factory amplifier to work around, just a replaceable head unit and 6.5-inch front speakers with a separate factory tweeter as the starting point. On a no-compromise budget with a DIY install, that openness is the appeal — every component, from the head unit to a dedicated amplifier to a top-shelf shallow or compact subwoofer fit under or behind the rear seat of the 2013 GMC Sierra 1500 (or a premium truck-specific enclosure), can be selected for performance rather than fit into whatever the factory left behind. Building it in stages at home keeps costs and complexity manageable while still landing on a system chosen entirely on merit, unconstrained by any factory amp or sub location in the 2013 GMC Sierra 1500.
The upgrade path
4 steps · ordered by impact · with DIY difficultyA direct single- or double-DIN swap is the right starting point for a full system build. The factory head unit's low preamp output is a bottleneck for everything downstream — a quality aftermarket unit with strong RCA voltage gives your amp a better signal to work with, which translates directly to lower noise and better dynamic range from your speakers. For a full build, look for a head unit with dedicated front, rear, and subwoofer preamp outputs so you can connect each zone of the amp independently. Since there's no factory amplifier in your 2013 GMC Sierra 1500, the signal path is straightforward — RCA out from the head unit, straight to the amp inputs. Get this step right and the rest of the chain benefits.
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A full build in your truck means every speaker position replaced: 6.5-inch components in the front doors with tweeters in the A-pillar locations, and quality coaxials in the rear pillar 4x6 locations. The factory layout already has a dedicated tweeter mount up front — components are a direct upgrade into that same space. In the rear pillars, 4x6 coaxials handle fill in the cab cleanly. Because you're doing this yourself, work through the cab systematically: front doors and A-pillars first, then rear pillars. Afterward, plan the amp wiring run along the floor while you have access — a full build means proper power driving the new speakers and the sub, and the wiring is easier before everything is buttoned back up. See the Best Car Speakers by Size guide for 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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For a full system build, the amplifier is what makes every other component perform at its potential. Your 2013 GMC Sierra 1500 has no factory amp, so you're starting fresh — and at a premium budget, that's an opportunity to do it right from the start. Size the amp (or amps) to the full channel count: one channel per speaker, plus a mono channel for the sub. A multi-channel amp that handles all the speaker channels plus a separate mono sub amp is a common and clean configuration. Run dedicated power and ground cables properly — undersized wiring is a common point where premium builds give up performance. Set gains with a multimeter or oscilloscope, not by ear.
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2013 GMC Sierra 1500 audio — common questions
What size speakers fit a 2013 GMC Sierra 1500?
The 2013 GMC Sierra 1500 uses 6.5" + tweeter front speakers and 4×6 rear speakers.
Does the 2013 GMC Sierra 1500 have a factory amplifier?
No factory amp — the 2013 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 2013 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 2013 GMC Sierra 1500?
The 2013 GMC Sierra 1500 has a Single/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 2013 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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