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

🔧 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

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

🔊 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