Step-by-Step Guide to Installing a Rockford Fosgate Shallow Loaded Enclosure in a Truck

Adding serious bass to a truck without sacrificing cab space is a challenge. Full-size subwoofer enclosures simply don't fit under most seats or behind the rear bench. That's why shallow mount subwoofers and pre-loaded enclosures have become the go-to solution for truck owners who want deep, punchy sound without giving up their precious cargo room.

Rockford Fosgate's shallow loaded enclosures combine a low-profile subwoofer with a perfectly matched, sealed enclosure so you get plug-and-play performance. In this guide, we'll walk you through the entire installation process, from choosing the right enclosure to wiring it safely and tuning it for the best sound. Whether you're a first-time installer or a seasoned pro, these steps will help you get the most out of your under-seat subwoofer.

Why Choose a Shallow Loaded Enclosure for Your Truck?

Trucks have unique audio challenges. The cabin is often separated from the cargo area, and the seating arrangement leaves little room for traditional subwoofer boxes. A shallow loaded enclosure is specifically designed to fit in tight spaces, such as under the front or rear seats, while still delivering impressive low-end response.

Rockford Fosgate's shallow enclosures are engineered to work with the included subwoofer, ensuring optimal air space and tuning. This means you don't have to guess about box volume or port tuning – everything is matched for you. Plus, the sealed design offers accurate, tight bass that complements a wide range of music genres.

• Space-saving design fits under most truck seats
• Pre-matched subwoofer and enclosure for optimal performance
• Sealed enclosure provides tight, accurate bass
• Simplifies installation – no need to calculate box specs

Tools and Materials You'll Need

Before you start, gather all necessary tools and materials. Having everything on hand will make the installation smoother and safer. You'll need basic hand tools, wiring supplies, and safety equipment.

Make sure you have the right wire gauge for your amplifier and subwoofer. Using too-thin wire can cause voltage drop and overheating, while too-thick wire is hard to route. For most shallow subwoofer systems, 16-gauge speaker wire is sufficient, but check your amplifier's requirements.

• Socket set and screwdrivers
• Wire strippers and crimpers
• Electrical tape and heat shrink tubing
• Multimeter for testing connections
• Appropriate gauge power and speaker wire
• Ring terminals and fuse holders

Step 1: Choose the Right Location

The most common location for a shallow loaded enclosure in a truck is under the front or rear seat. Measure the available space carefully, considering seat movement and any brackets or supports underneath. Ensure the enclosure won't interfere with seat adjustment or airbags.

If you're installing under the rear seat, check for any factory subwoofer or amplifier locations that might affect placement. Also, consider ventilation – the amplifier and subwoofer need airflow to prevent overheating. Plan your wiring route to avoid pinching wires under the seat.

Step 2: Prepare the Wiring

Run the power wire from the battery to the amplifier location, using a fuse holder near the battery for safety. Use a grommet when passing through the firewall to prevent chafing. Connect the ground wire to a clean, bare metal point on the chassis, keeping it as short as possible.

For the signal and remote turn-on wires, route them away from power cables to avoid noise. If your amplifier has high-level inputs, you can tap into the factory speaker wires; otherwise, use RCA cables from your head unit. Make all connections secure with crimp connectors or soldering.

• Always disconnect the battery negative terminal before working on electrical connections.
• Use a fuse rated for your amplifier's power requirements – for example, a 40 Amp AGU Fuse or 60 Amp AGU Fuse depending on your system.



• Secure all wires with zip ties or wire looms to prevent rattling.

Step 3: Install the Enclosure

Place the shallow loaded enclosure in the chosen location. Ensure it's level and stable. If necessary, use foam or rubber padding to prevent vibrations and rattling. Secure the enclosure using brackets or heavy-duty Velcro, depending on the surface.

If your enclosure comes with mounting tabs, use them to bolt it down. For under-seat installations, make sure the seat still moves freely and that the enclosure doesn't obstruct any safety mechanisms. Double-check that all wiring is clear of moving parts.

Step 4: Connect the Subwoofer

Connect the subwoofer wires from the amplifier to the enclosure's terminal cup. Ensure correct polarity – positive to positive, negative to negative. If you're using a dual voice coil subwoofer like the Power 10" T1 4-Ohm DVC Subwoofer, check the impedance configuration to match your amplifier's stable load.

For a single voice coil subwoofer, simply connect the two terminals. Use spade connectors or bare wire, and tighten the terminal screws securely. Verify that there are no stray wires that could short out.

Step 5: Set the Amplifier Gains

Before powering up, set the amplifier's gain to minimum, crossovers to the appropriate frequency (usually around 80 Hz for subwoofers), and any bass boost to zero. This prevents damage during initial testing.

Power up the system and play a test tone or music with bass. Gradually increase the gain until you hear distortion, then back off slightly. Use a multimeter to set the gain accurately if you prefer, but your ears are a good guide. The goal is to get clean, powerful bass without clipping.

Step 6: Test and Fine-Tune

Once everything is connected and set, test the system at various volume levels. Listen for any rattles or vibrations, and secure any loose wires or panels. Adjust the crossover and phase controls to blend the subwoofer with your main speakers.

You may need to adjust the subwoofer level to match your listening preferences. Many amplifiers have a remote bass knob that allows you to control bass from the driver's seat – if yours has one, mount it in an accessible location.

• Use a phase switch to align the subwoofer with your main speakers for better mid-bass integration.
• If you experience engine noise, check your ground connection and RCA routing.
• Consider adding sound deadening material to reduce road noise and improve bass response.

Installing a Rockford Fosgate shallow loaded enclosure in your truck is a rewarding project that dramatically improves your audio system without sacrificing space. By following these steps, you'll enjoy deep, accurate bass that makes every drive more enjoyable. If you're ready to upgrade, explore our selection of shallow mount subwoofers and enclosures to find the perfect fit for your truck.