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Subwoofer Enclosures Passive

Passive Subwoofer Enclosure Collection

Non-Amplified Automotive Loaded Subwoofer-Enclosures

Loaded subwoofer enclosures come in Passive or Active styles. Passive enclosures, or boxes, require an additional amplifier to produce sound while Active enclosures have amplifiers built into them and are self contained all-in-one systems.

Subwoofer drivers, also know as subs, are specific only to the lowest frequencies of the sound spectrum, and are the largest drivers in any car stereo. They are generally found in sizes of 8″ – 12″ diameters. Subs move massive amounts of air creating large pressure waves. These large pressure waves give that bottom end punch you expect from your kick drum, the undeniable funk of a bass guitar and the earthshaking bump of a house beat. 

The frequency range of a subwoofer generally covers the first 2 octaves of the sound spectrum, also known as the lows. Subwoofers require their own mounting structure called a sub box. Sub boxes are built to create negative pressure on the sub to help move their large diameter cones back and forth for accurate reproduction of low end frequencies. Custom subwoofer boxes are built to meet certain cubic air space specifications of sub drivers and are sometimes custom built to fit under seats or other hidden areas to maximize the use of space in the vehicle. JL Audio’s Stealthbox's are custom designed to fit many vehicles while minimizing the footprint needed to be installed in your car.

RMS vs. MAX power: The RMS rating of any speaker driver is the continuous power rating that the speaker is designed to withstand at a maximum continued volume rating. The RMS rating is the only number to go by when pairing your speakers with an amplifier. As an example a speaker with a 100Watt, or 100W for short, RMS rating and a 300-Watt Max rating is ultimately a 100 Watt speaker. The Max rating is the temporary spikes in voltage that the speaker can handle. A 100-Watt RMS / 300-Watt Max speaker is going to outperform a 100W RMS / 250W Max speaker at higher volumes, but may not be the more detailed reference speaker.

Ohms: The Ohm rating, or resistance rating, of a speaker is an essential part of a well balanced car stereo system. Many JBL factory speaker systems have 2ohm drivers. Most aftermarket speakers are 4ohm drivers. Replacing these types of factory speakers may require a wiring bypass of the factory amplifier.

Driver resistance ratings are essential when pairing subwoofer and speaker drivers with amplifiers. An amplifier that is 750W @ 2ohms might only generally be 500W or less @ 4ohms. When purchasing a subwoofer driver the correct pairing of a subwoofer’s RMS wattage and Ohm ratings with an amplifier’s output power rating is absolutely essential.

Frequency Response: Frequencies are measured in Hertz or Hz for short. The frequency response of speaker drivers will generally fall between 20Hz and 22kHz. At 20Hz the sound spectrum begins. Every time you double your frequency you move up one octave in scale. 20-Hertz to 40-Hertz covers the first Octave, 40Hz to 80Hz covers the next octave and so on. Subwoofer drivers are generally tuned to crossover at 80 Hertz. This can depend on the subwoofer type and the type of music you listen to.

2 products

  • Alpine R2-DB8V-TRK : Dual 8" Loaded Under Seat Subwoofer Enclosure with Amp Space, 750W @ 2Ω Jeep and other Pickups Alpine R2-DB8V-TRK : Dual 8" Loaded Under Seat Subwoofer Enclosure with Amp Space, bottom side.

    Alpine R2-DB8V-TRK : Dual 8" Loaded Under Seat Subwoofer Enclosure with Amp Space, 750W @ 2Ω Jeep and other Pickups

    Pre-Order Today!

    From towing to travel, you depend on your truck to get you where you want to go, but can you rely on getting the best performance from your sound system? Now you can add deep, accurate bass in your truck without compromising valuable cabin space with the new R2-DB8V-TRK dual 8” Alpine Halo R-Series preloaded truck subwoofer enclosure with the ProLink system and amplifier space. The enclosures were intentionally crafted to fit most full-size trucks. Two 8” subwoofers are preloaded into a compact enclosure for under the seat installation and linked with a ProLink bracket that can adjust from 51”-40”. Centered on the enclosures is an integrated amplifier mount tray that’s optimized for Alpine’s S-A75M Mono Power Amplifier (sold separately). Rubber “feet” are adjustable in height to accommodate uneven truck floors.  These ported subwoofer enclosures feature the next-generation 8” R-Series subwoofers with a more powerful motor that creates deeper bass while Alpine’s High Amplitude Multi-Roll (HAMR) surround technology allows the subwoofer cone to efficiently move air while staying cool for incredible accuracy. A new ceramic composite dust cap has higher heat resistance that ensures non-stop bass performance. Alpine’s new preloaded truck subwoofer enclosures join the Alpine Halo family with a premium, unmistakable design. The enclosure pulls design cues from the Alpine Halo display with unique, curved edges outlined by a silver trim and a front link bracket cover with an Alpine logo badge. The 5/8” MDF enclosures are covered in a premium black carpet that will elevate the look of your truck. With two preloaded R2-W8D2 8” R- Series subwoofers that are tuned to 36Hz, R2-DB8V-TRK is optimized to perform with Alpine’s R-Series sound system line. Dual voice coils are wired in parallel for a 2Ω load that’s compatible with Alpine’s R-Series R2-A75M mono power amplifier. Features Groundbreaking Alpine Halo Design  ProLink™ Ported Enclosure Expandable Width from 40" to 51"  Compact, Under-the-Seat Installation in Most Full-Size Trucks Integrated Amplifier Tray (not applicable with all vehicles) Rubber, Modular Stackable Foot Design Accommodates Uneven Truck Floor Areas Ported Enclosures with High-Performance S-Series Subwoofers   Front Link Alpine Branded Bracket Side-Firing Cabin Loading Ports Premium Alpine Wire Terminals CARB Compliant 5/8" MDF Construction  Premium Black Carpet  Specifications Dimensions: 40"-51" (Adjustable Width) x 8-3/4” (H) x 13-3/4” (D) 750W RMS Frequency Response: 32Hz-200Hz  Sensitivity: 84dB  Dual voice coils Wired in Parallel for a 2Ω Load (Compatible with R-A75M) Vented Enclosure Tuning Frequency: 36Hz   Custom spring-loaded speaker terminals fit up to 12AWG speaker wire  Alpine R2-DB8V-TRK BrochureAlpine R2-DB8V-TRK Manual

    Pre-Order Today!

    $799.99

  • Alpine S-DB8V-TRK : Dual 8" Loaded Under Seat Subwoofer Enclosure with Amp Space, 600W @ 2Ω Jeep and other Pickups Alpine S-DB8V-TRK : Dual 8" Loaded Under Seat Subwoofer Enclosure with Amp Space, bottom side.

    Alpine S-DB8V-TRK : Dual 8" Loaded Under Seat Subwoofer Enclosure with Amp Space, 600W @ 2Ω Jeep and other Pickups

    Pre-Order Today!

    S-Series Dual Loaded 600-Watt 8-Inch 2-Ohm Subwoofer Enclosure for Select Jeep Wrangler-JL Gladiator-JT and other Pickup Vehicles From towing to travel, you depend on your truck to get you where you want to go, but can you rely on getting the best performance from your sound system? Now you can add deep, accurate bass in your truck without compromising valuable cabin space with the new S-DB8V-TRK dual 8” Alpine Halo S-Series preloaded truck subwoofer enclosure with the ProLink system and amplifier space. The enclosures were intentionally crafted to fit most full-size trucks. Two 8” subwoofers are preloaded into a compact enclosure for under the seat installation and linked with a ProLink bracket that can adjust from 51”-40”. Centered on the enclosures is an integrated amplifier mount tray that’s optimized for Alpine’s S-A60M Mono Power Amplifier (sold separately). Rubber “feet” are adjustable in height to accommodate uneven truck floors.  The enclosures are designed for the unique cabin environment of your truck. The ported subwoofer enclosures feature Alpine’s reliable 8” S-Series subwoofers. The subwoofers are designed with an improved voice coil that brings out the full potential of the subwoofer. The custom-stamped steel frame is designed to withstand the rigors of the strong S-Series motor. Frame leg vents, as well as a vented backplate, keep the subwoofer cool for non-stop bass performance. Alpine’s new preloaded truck subwoofer enclosures join the Alpine Halo family with a premium, unmistakable design. The enclosure pulls design cues from the Alpine Halo display with unique, curved edges outlined by a silver trim and a front link bracket cover with an Alpine logo badge. The 5/8” MDF enclosures are covered in a premium black carpet that will elevate the look of your truck. With two preloaded S-W8D2 8” S- Series subwoofers that are tuned to 36Hz, the S-DB8V-TRK is optimized to perform with Alpine’s S-Series sound system line. Dual voice coils are wired in parallel for a 2Ω load that’s compatible with Alpine’s S-Series S-A60M mono power amplifier. Features Groundbreaking Alpine Halo Design  ProLink™ Ported Enclosure Expandable Width from 40" to 51"  Compact, Under-the-Seat Installation in Most Full-Size Trucks Integrated Amplifier Tray (not applicable with all vehicles) Rubber, Modular Stackable Foot Design Accommodates Uneven Truck Floor Areas Ported Enclosures with High-Performance S-Series Subwoofers   Front Link Alpine Branded Bracket Side-Firing Cabin Loading Ports Premium Alpine Wire Terminals CARB Compliant 5/8" MDF Construction  Premium Black Carpet  Specifications Dimensions: 40"-51" (Adjustable Width) x 8-3/4” (H) x 13-3/4” (D) 600W RMS Frequency Response: 34Hz-200Hz  Sensitivity: 84dB  Dual voice coils Wired in Parallel for a 2Ω Load (Compatible with S-A60M) Vented Enclosure Tuning Frequency: 36Hz   Custom spring-loaded speaker terminals fit up to 12AWG speaker wire Alpine S-DB8V-TRK BrochureAlpine S-DB8V-TRK Manual

    Pre-Order Today!

    $699.99

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