Proline X

When you drop Kicker Solo X 8s into a random prefab box, you’re leaving output, bandwidth, and durability on the table. You spent good money on those subs – the enclosure should be built to match.

Our new ProLine X X Series Dual 8" ported enclosure is purpose‑designed around the Solo X 8 platform. That means airspace, port tuning, baffle thickness, and bracing are all engineered with brutal daily abuse, demo sessions, and real‑world power in mind – not just a pretty CAD drawing. This enclosure is empty and ready to load, so you keep full control over your equipment while we handle the box design and build quality.

Every enclosure is CNC‑cut for repeatable precision. Joints are tight, angles are correct, and baffles line up exactly where they should. The result is a solid, dead‑feeling cabinet that resists flex and keeps your sub’s energy working with you instead of fighting panel vibration. The heavy‑duty construction and high‑quality finish mean you get a box that looks as serious as it sounds when you open the hatch at a show or meet.

We designed this Dual 8" X Series to make installation as straightforward as possible: proper cutout sizing for the Solo X 8, correct mounting depth clearance, and smart overall dimensions so it fits real vehicles instead of just looking good on paper. If you’ve ever wasted a weekend modifying a “universal” box to make it work, you’ll appreciate how much easier it is to start with something that was actually built for your sub from the start.

Whether you’re chasing numbers, trying to build a nasty daily demo, or just want your Solo X 8s to finally sound like they should, this enclosure is the missing piece between “loud enough” and “this is ridiculous.” You bring the power and the subs – we bring the precision enclosure that lets them do their job.

Tap to see full specs, dimensions, and availability, and load your Solo X 8s into a box that’s actually built for them.
https://audiointensity.com/products/proline-x-enclosure-x-series-fits-kicker-solo-x-8-subwoofer-dual

Dropping a Solo X into a random prefab is like putting race‑fuel in a lawnmower.

The Proline X X‑Series is a full lineup of ported enclosures built around KICKER’s Solo X subs—net volume, tuning, port area, and bracing all dialed for real power and extreme excursion. Single, dual, and triple boxes for Solo X 8s, 10s, 12s, and 15s, ready to handle serious wattage and abuse.

Whether you’re building a brutal daily or chasing numbers, start with an enclosure that’s made for Solo X from the ground up. Hit Shop Now or visit https://audiointensity.com/collections/proline-x-x-series-enclosures-built-for-the-kicker-solo-x to see every X‑Series option.

Most IDMAX 12s end up in whatever generic sealed box was on the shelf. They still play—but they’re not performing anywhere near their potential.

Our American‑built Proline X Professional Series sealed enclosure is precision‑built for the IDMAX 12 from the ground up: correct volume, solid bracing, CNC‑cut panels, and a pro‑grade finish that actually belongs in a serious build. The result is a tighter, more controlled low end and a box that feels as premium as the sub you dropped in it.

If you’re tired of compromising your system with a “good enough” enclosure, step up to professional‑grade.

https://audiointensity.com/products/professional-series-enclosure-image-dynamics-idmax-12-sealed-box

🔧 Most enclosures lock you into one configuration. This one doesn't.
The Proline-X Flex Series Down-Fire is a 1 cubic foot enclosure built around interchangeable faceplates — swap between single 12" sealed, dual 10" sealed, or single 10" ported without buying a new box. The side plates swap too, so you can flip between sealed and ported tuning as your build evolves. Change your sub, change your sound preference, change your setup — the box keeps up.
Down-firing design keeps the woofer protected from cargo and out of sight while enhancing bass projection. MDF construction, black carpet finish, feet included. At 28" W x 15" D x 7" H it sits low and clean in a trunk or cargo area without eating the whole space.
And if you want it personalized — there's an option for a laser-engraved acrylic insert on the front. Upload your logo, artwork, or custom text and we'll cut it in.
You provide the mounting hole size at checkout. We cut the faceplate to your woofer. Simple.
Starts at $279.99.
👉 https://audiointensity.com/products/proline-x-micro-flex-series-downfire-subwoofer-box

🔧 The wrong box kills a good subwoofer. Here's how to skip that problem entirely.
Every loaded enclosure in our Proline-X collection ships with the subwoofer already installed, airspace already dialed, and the driver matched to the enclosure it was designed for. You're not guessing at volume, port tuning, or compatibility — that work is already done. Hook up an amp and you're playing.
The collection runs from Prodigy NB2 ported 10" for entry-level builds all the way up to dual Kicker SoloX 15s in a competition-grade ported Professional Series box. In between: Micro Series shallow installs with JL Audio TW3s and Wavtech thinPROs for tight spaces, Arc Audio down-fire builds for under-seat applications, and direct-fit Ford F-150/F-250 enclosures that drop behind the seat without modification.
CNC-cut MDF. Tennessee-built. Assembled to order where noted. Every one of them is a box we'd actually install.
👉 https://audiointensity.com/collections/loaded-subwoofer-boxes

🔊 This isn't a subwoofer system. It's a statement.
The Proline-X Professional Series ported 15" enclosure loaded with the Kicker SoloX L7X 15" is now available at Audio Intensity — and there's only 1 left.
The SoloX is Kicker's most powerful 15" subwoofer. Patented square cone technology giving 20% more surface area than a round driver. Triple-stacked ferrite magnet structure weighing over 25 lbs. on its own. 2000W RMS power handling. 31.25mm of linear Xmax. Forced Air Cooling for sustained high-output runs. Field-replaceable no-glue recone kit so you're never sidelined at a competition.
The Proline-X enclosure is built specifically around this driver — 5.0 cu. ft. net, tuned to 30Hz, 70 square inches of port area, triple-layer 2.25" thick mounting baffle, extreme internal bracing, and CNC-precision construction from USA-sourced MDF. Professionally assembled in our Tennessee shop. Pre-wired with 8 AWG OFC cable. Ready to connect and destroy.
At 151 lbs. complete, freight shipping is included in the price.

👉 https://audiointensity.com/products/proline-x-professional-series-ported-15-enclosure-loaded-kicker-solox-15

🔊 You spent the money on a JL Audio 13W7. Don't bury it in a generic box.
The Proline-X Professional Series ported enclosure for the JL Audio 13W7 is built to one spec and one spec only — unlocking everything that driver is capable of. Internal volume calculated to JL Audio's own ported recommendation of 2.375 cu. ft. Port tuned to move air cleanly without turbulence or distortion. CNC-cut MDF construction. Handcrafted in the USA. Reinforced corners and mounting points that won't flex under 1,500W RMS of continuous abuse.
The 13W7 is one of the most capable 13.5" subwoofers ever built — with 32mm of one-way linear excursion and DMA-optimized motor technology. It deserves an enclosure that was actually designed around it.

👉 https://audiointensity.com/products/proline-x-jl-audio-13w7-ported-subwoofer-enclosure

Already have a 12" sub picked out? This is the box it deserves.
The Proline-X P12-WS III is a sealed wedge enclosure built for enthusiasts who know what they're doing. 1.25 ft³ of precisely tuned sealed airspace compatible with virtually any 12" driver. Dado-cut interlocking joints machined to ±0.005" on ShopSabre industrial CNC routers. Airtight Titebond II assembly. Pre-wired 12-gauge OFC terminal cup. Handcrafted in our Tennessee shop.
The Gen III wedge profile saves 3–5 inches of trunk depth compared to a standard rectangle, without sacrificing internal volume. Tight, accurate, musical sealed bass — no boominess, no box talk.

🔗 https://audiointensity.com/products/proline-x-performance-wedge-p12-ws-iii-sealed-enclosure-for-12-subwoofers

🚗 No room for a subwoofer? Think again.
The Proline-X Micro Series M10-S loaded with the Wavtech thinPRO 10 is only 4.5 inches deep — and it handles 750W RMS.
This isn't a compromise box. The thinPRO 10 packs a honeycomb Nomex® + glass fiber cone, 20mm of linear Xmax, a 4.5" dual-gap motor with stacked strontium magnets, and a vented cast aluminum frame into a 2.9" mounting depth. We mount it in our Tennessee shop into a precision-tuned 0.4 cu.ft. sealed Proline-X enclosure — CNC-cut, stack-fab MDF, threaded inserts, prewired 12-gauge terminal cup. Ready to connect to your amp and go.
Front-firing or down firing. Behind the seat. Under the floor. In the trunk. It fits where nothing else will.

👉 https://audiointensity.com/products/proline-x-micro-series-sealed-10-enclosure-loaded-wavtech-thinpro-10

🔊 Real bass. No guesswork. No compromises.
Introducing the Proline-X Ported 10" Loaded Enclosure — our own CNC-built box paired with the Prodigy Audio NB2, and it's ready to drop straight into your build.
The NB2 packs 14mm of linear Xmax and handles 400W RMS. The Proline-X enclosure is CNC-cut from 3/4" MDF, braced, tuned to 33Hz, and assembled right here in our Tennessee shop. Zero port noise. Zero box talk. Just clean, deep bass.
Starting at $289.99 — assembled to order, ships in 2–5 business days.
https://audiointensity.com/products/proline-x-ported-10-enclosure-loaded-with-prodigy-audio-nb2

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