The Ultimate 2014-2018 Chevy Silverado & GMC Sierra Double Cab Subwoofer Enclosure Buyer’s Guide
The NVX custom subwoofer platform for the 2014 to 2018 Chevrolet Silverado and GMC Sierra 1500, 2500 HD, and 3500 HD Double Cabs (K2XX Generation) offers an integrated under-seat bass upgrade engineered specifically for full-size GM pickup trucks.
The Chevrolet Silverado and GMC Sierra Double Cabs are known for solid utility and functional rear passenger seating. However, their factory audio systems tend to lack impact, sounding flat, hollow, and devoid of low-end depth.
Good thing NVX offers integrated under-seat bass solutions that can give you and your passengers an immersive bass experience. You can choose across distinct configuration options:
- a standalone single 10" empty enclosure (VE-GM-SLVDCG3-D10S
- a standalone single 12" empty enclosure (VE-GM-SLVDCG3-D12S
- a standalone dual 10" loaded enclosure (LVE-GM-SLVDCG3-D10S
- and a standalone dual 12" loaded enclosure (LVE-GM-SLVDCG3-D12S.
Where Is the NVX Subwoofer Enclosure Installed in Your Silverado or Sierra?
The NVX custom subwoofer enclosure is installed directly underneath the rear passenger bench seat, sliding flat into the factory under-seat floor recess.
Its low-profile design fits beneath the rear seat frame, allowing the seats to fold up or down freely without contacting the cabinet or pinching speaker surrounds. The enclosure utilizes a sealed layout, directing sound waves smoothly throughout the cabin interior.
Mounting the enclosure under the rear bench provides two major operational advantages:
- Physical Protection: Tucking under the bench shields the woofer cones and butyl rubber surrounds from boots, tools, gear bags, or cargo placed on folded seats.
- Acoustic Boundary Loading: Sound waves bounce directly off the interior cab surfaces before expanding upward into the cabin. This boundary reflection acts as a natural acoustic horn, increasing overall sub-bass output and low-end efficiency inside full-size pickup cabs.
Important Cab Fitment Note: All enclosures in this lineup are engineered strictly for 2014-2018 Chevrolet Silverado and GMC Sierra Double Cab (featuring smaller front-hinged rear doors) models, including 1500, 2500 HD, and 3500 HD trims. They will NOT fit Crew Cab models (which feature four full-size rear doors and a different under-seat floor pan depth) or Regular Cab trucks.
Why NVX Outperforms Other Brands in Value
NVX makes custom-fit enclosures accessible directly to truck owners. This eliminates the need for bulky square boxes or flimsy plastic all-in-one powered units.
- Heavy-Duty 3/4" MDF Construction vs. Flexing Plastic: Generic powered units frequently use thin plastic shells that flex, vibrate, and rattle under acoustic load. NVX enclosures use dense, CNC-mitered 3/4-inch medium-density fiberboard (MDF) to eliminate cabinet flex and resonance.
- 350W to 800W RMS High-Output Engineering: While plastic powered subs max out at 100W-150W RMS, these NVX single and dual setups handle an honest 350W to 800W RMS using carbon fiber reinforced polypropylene cones and heavy Y30 ferrite magnets.
- Direct Value Engineering & OEM Integration: Finished in premium black automotive carpet color-matched to original Chevrolet and GMC interior linings, the box tucks away discreetly under the rear seat for a clean, factory-installed look while avoiding heavy brand markups.
Configuration Comparison: Pick Your Ideal Setup
Selecting the right SKU for your Silverado or Sierra Double Cab depends on your output goals, driver size preference, and current hardware setup:
1. Single vs. Dual Driver Configurations
Available in 10-inch and 12-inch sizes. Single driver empty enclosures allow for targeted bass addition, while dual loaded enclosures (700W-800W RMS) span the full under-seat floor width for maximum air displacement and chest-pounding impact.
2. Inclusion Tier: Empty vs. Loaded Enclosures
- Empty Enclosures (VE Series): Custom 3/4" MDF sealed box with terminal cups and internal wiring. Perfect if you already own 10-inch or 12-inch shallow-mount subwoofers.
- Loaded Enclosures (LVE Series): Factory pre-loaded with NVX S-Series SMW shallow-mount subwoofers pre-wired to a 1-ohm final mono load.
Comparison Matrix
| Configuration Type | Power Rating (RMS / Peak) | Included Subwoofer | Included Hardware & Accessories |
| Single / Dual 10" Sealed (Empty) | Depends on User's Woofer | None (User Supplied 10" Sub) | Sealed 3/4" MDF Box + Terminal Cup |
| Single / Dual 12" Sealed (Empty) | Depends on User's Woofer | None (User Supplied 12" Sub) | Sealed 3/4" MDF Box + Terminal Cup |
| Dual 10" Sealed (Loaded) | 700W RMS / 1400W Peak | Dual 10" SMW Shallow Subs (1-Ohm Load) | Pre-Installed Dual 10" Subs + Terminal Cups |
| Dual 12" Sealed (Loaded) | 800W RMS / 1600W Peak | Dual 12" SMW Shallow Subs (1-Ohm Load) | Pre-Installed Dual 12" Subs + Terminal Cups |
Why a Sealed Enclosure Is Ideal for Silverado & Sierra Double Cab Acoustics
Pickup truck cabs present compact, highly reflective acoustic spaces surrounded by glass and metal. In this environment, ported (vented) boxes can frequently generate loose, boomy bass overhang that masks mid-range vocals.
A sealed enclosure acts as a pneumatic air spring behind the woofer cone. As the voice coil moves, internal air pressure keeps the cone under strict mechanical control, preventing over-excursion and yielding fast, articulate transient response.
Inside a Double Cab truck, a sealed enclosure produces tight, punchy kick drums and precise basslines that hit hard and stop on a dime without sounding muddy.
Power Integration, System Safety & Factory Radio Integration
Overcoming Factory GM Radio Bass Roll-Off
Factory Chevrolet and GMC head units feature internal processing algorithms that automatically decrease low-frequency bass output as you raise the volume knob. This factory roll-off protects weak door speakers, but leaves aftermarket subwoofers sounding flat at higher volume levels.
Connecting an active line-output converter like the NVX XLCA2X taps into factory speaker lines, transforms high-level signals into clean low-level RCA outputs, and uses integrated xBOOST signal restoration (30 Hz–60 Hz) to feed a flat, distortion-free sub-bass signal to your amplifier.
Recommended Monoblock Amplification
- For Single 10" or 12" Enclosures (350W-400W RMS @ 2 Ohms): Pair with the NVX VADM1 Micro Class-D Monoblock Amplifier. Delivering clean power at 2 ohms, its micro chassis mounts out of sight under a front seat frame.
- For Dual 10" or 12" Loaded Enclosures (700W-800W RMS @ 1 Ohm): Pair with the NVX VAD10001v2 Class-D Monoblock Amplifier. Supplying up to 1000W RMS at 1 ohm, it provides clean power headroom in a compact chassis.
100% Pure OFC Wiring Grid Requirement
To ensure clean current flow from the battery without electrical resistance, installers should run a 100% pure oxygen-free copper (OFC) wiring kit (such as the 8-gauge NVX XKIT82 for single subs or 4-gauge NVX XKIT42 for dual subs). Pure copper conductors prevent high wire resistance and voltage drops, keeping your amplifier operating safely and reliably.
Frequently Asked Questions
Will this under-seat enclosure fit Double Cab or Crew Cab trucks?
This specific lineup is engineered strictly for 2014–2018 Double Cab (featuring smaller front-hinged rear doors) models. Crew Cabs feature a different under-seat floor pan depth and require Crew Cab-specific enclosures.
Can I still fold my rear seats up or down with this box installed?
Yes. The enclosure profile is custom-molded to clear the bottom seat cushion frame, allowing full seat folding utility without contacting the cabinet or woofers.
What is the maximum mounting depth if I choose an empty enclosure?
The empty 10-inch and 12-inch enclosures offer up to 4.0 inches of subwoofer mounting depth with generous internal air volume (1.25 cu. ft.), accommodating high-performance shallow-mount subwoofers.