Proline X

Proline X | Image Dynamics IDMAX 15 Sealed Subwoofer Enclosure | Professional Series

SKU: Pro 15-S IDMAX

QUICK SPECS

Configuration: Single 15" Sealed | 2.0 cu ft net — spec-matched to IDMAX 15 V4 published recommendation | Includes branded acrylic insert
Dimensions: 28" W × 18" H × 11.75" D | ~35 lbs | Plush Black carpet | Shipping included
Construction: 1.5" Double-Layer Baffle | Threaded Inserts + 8/32 Machine Screws | Dado + V-Groove CNC Joinery | Extensive Internal Bracing
Terminal: Proline X ABS/Carbon Fiber Cup | Pre-wired 12g OFC | Fits IDMAX 15 V4 D2 or D4 — Enclosure Only

Shipping Included No freight charges at checkout. What you see is what you pay.

Built in Tennessee CNC cut from 3/4" Langboard Elite MDF. V-groove and dado joinery.

Advanced Terminal Cup Built in-house. ABS/Carbon Fiber. Stainless steel hardware. Copper ring terminals.

$ 379.99

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Proline X | Image Dynamics IDMAX 15 Sealed Subwoofer Enclosure | Professional Series

$ 379.99

Enclosure Type Sealed

External Dimensions 28" x 18" x 11.75"

Net Volume 2.0cu ft

Tuning Frequency N/A

Port Area N/A

Front Panel Thickness 1.5"

INSTALLER'S TAKE

The IDMAX 15 V4 is a large-format high-excursion driver — 15", 1200W RMS, 22mm one-way Xmax, Qts of 0.48–0.50. ID publishes 2.0 cu ft sealed and this box hits that number exactly. Single chamber, sealed, 2.0 cu ft net.

The 1.5" double-layer baffle and threaded inserts are structural requirements at this driver size and power level — not feature upgrades. Terminal cup is pre-wired 12g OFC to your selected impedance. Mount the driver with the 8/32 machine screws into the threaded inserts, connect your amp, done.

This SKU includes a branded Proline X acrylic insert on the baffle — a visual detail that sets it apart from a plain-carpet box. Worth calling out to customers who care about the finished look of their install.

Box is 28" × 18" × 11.75" external, ~35 lbs — notably compact for a 15" sealed enclosure. The 18" height is the dimension to check against available trunk space. The 14.80" cutout diameter on the IDMAX 15 requires a significant baffle opening — confirm baffle dimensions are sufficient before the driver goes in.

D2 parallel → 1Ω. D4 parallel → 2Ω. Match to amplifier stable impedance before selecting variant.

Product Details

Professional Series

The IDMAX 15 — Sealed, Spec-Matched, and Built to Show

The Image Dynamics IDMAX 15 V4 is a 15" high-excursion driver rated at 1200 watts RMS with a motor tuned for the SQ listener who also wants output. This enclosure is spec'd to exactly 2.0 cu ft net sealed — the number Image Dynamics publishes — built with the structural integrity to stay accurate at sustained power, and finished with a branded acrylic insert that sets it apart on the install. Enclosure only. Driver not included.

2.0 cu ft net

22mm IDMAX Xmax (1-way)

1200W RMS rated

1.5" Double-layer baffle

Compatible Driver

Built exclusively for the Image Dynamics IDMAX 15 V4 (D2 or D4). Full driver specs at imagedynamicsusa.net.

Built to the Driver's Numbers — Not a Generic Template

The IDMAX 15 V4 has a Qts of 0.48–0.50 depending on variant — both squarely in sealed alignment territory. Image Dynamics publishes 2.0 cu ft as the recommended sealed volume for this driver, and this enclosure delivers exactly that. Not a rounded-up shelf-friendly number. Not a compromised volume driven by an available box profile. The number the driver was designed around.

A 15" driver in a correctly sized sealed box produces controlled, extended low-frequency output with fast transient response and the acoustic damping that a high-excursion motor needs to stay accurate under load. This is not the box for customers chasing peak SPL. It's the box for customers who want a correctly operating IDMAX 15 — clean, loud, and accurate at real-world power levels.

Includes Branded Acrylic

This enclosure includes a Proline X branded acrylic insert — laser-cut and finished in-house — mounted to the baffle. It's a visual finish detail that distinguishes this build from a plain-carpet box and marks it as a purpose-built Professional Series enclosure.

1.5" Double-Layer Baffle with Threaded Inserts

The IDMAX 15 V4 is a heavy, high-force driver — 17.36 Tm BL factor on the D2 variant, a large-format 15" motor that generates significant baffle load under sustained 1200W operation. This enclosure uses a 1.5" double-layer baffle — two full sheets of Langboard Elite MDF bonded and CNC-cut as a single unit. Baffle flex at this driver size and power level introduces distortion and mounting hardware stress. The double-layer eliminates that flex entirely.

Threaded inserts are installed through the baffle matched to the IDMAX 15's bolt pattern. The driver mounts with 8/32 machine screws — metal-to-metal threading, not wood screws into MDF. It stays torqued under vibration and survives repeated remounts without stripping.

Dado + V-Groove Joinery | Extensive Internal Bracing

A sealed enclosure at 2.0 cu ft with a 15" driver running 1200W generates sustained internal pressure across every panel. Every joint in this enclosure is CNC-cut to interlock before adhesive is applied — dado joints recess each panel into its mating surface, V-groove cuts at panel edges create a mechanical lock. Extensive internal bracing ties opposing walls and spans panel runs throughout. The cabinet stays rigid, the airspace stays constant, and the bass the driver produces is what the customer hears — not a distorted version filtered through a flexing box.

MDF

Langboard Elite 3/4"

Mill-certified panel stock. 48.5 lbs/ft³ density, 200 psi internal bond, 410,000 psi MOE. Every panel traceable to published mill data.

Joinery

Dado + V-Groove CNC

Panels interlock mechanically before adhesive is applied. The joint holds independent of glue — essential for a 15" driver at 1200W RMS in a sealed enclosure.

Bracing

Extensive Internal Bracing

Wall-to-wall and panel-spanning bracing throughout. Panel resonance eliminated at the structure level — the box doesn't add its own signature to the bass.

Terminal

Proline X ABS/Carbon Fiber Terminal Cup

Built in-house. Stainless steel hardware. Copper ring terminals. Pre-wired 12-gauge OFC speaker wire to your selected impedance.

Wiring Options — D2 and D4

The IDMAX 15 V4 is available in Dual 2-ohm (D2) and Dual 4-ohm (D4). A single driver wires as follows:

D2 — voice coils parallel → 1Ω final load. Voice coils in series → 4Ω final load.

D4 — voice coils parallel → 2Ω final load. Voice coils in series → 8Ω final load.

The most common configurations for a single high-current amp are 1Ω (D2 parallel) and 2Ω (D4 parallel). Match to your amplifier's stable impedance rating before selecting a variant.

Enclosure only. The Image Dynamics IDMAX 15 V4 is not included. This enclosure is built for the IDMAX 15 V4 exclusively — it is not a universal 15" box. Verify cutout diameter (14.80") and mounting depth (10.40") against your install before ordering.

2-Year Warranty

Every Proline X Professional Series enclosure is covered by a 2-year warranty against defects in materials and workmanship. Built in Tullahoma, Tennessee. Shipping included — no freight charges at checkout.

Enclosure Specifications

Specification	Value
SKU	Pro ID 15-S Max
Series	Professional Series
Compatible Driver	Image Dynamics IDMAX 15 V4 (D2 or D4)
Configuration	Single 15" \| Sealed
External Dimensions	28" W × 18" H × 11.75" D
Net Internal Volume	2.0 cu ft
Front Panel Thickness	1.5" (double-layer Langboard Elite MDF)
Panel Material	Langboard Elite 3/4" MDF — 48.5 lbs/ft³ density, 200 psi internal bond, 410,000 psi MOE
Joinery	CNC dado + V-groove
Internal Bracing	Extensive
Baffle Hardware	Threaded inserts, 8/32 machine screws
Terminal Cup	Proline X ABS/Carbon Fiber Composite — stainless steel hardware, copper ring terminals
Internal Wiring	Pre-wired 12-gauge OFC speaker wire
Acrylic Insert	Branded Proline X acrylic — laser-cut, finished in-house
Exterior Finish	Plush Black carpet
Approximate Weight	~35 lbs
Price	$379.99
Shipping	Included — UPS Ground
Warranty	2 years
Built	Tullahoma, Tennessee, USA
IDMAX 15 Cutout Diameter	14.80"
IDMAX 15 Mounting Depth	10.40"
IDMAX 15 Xmax (one-way)	22mm
IDMAX 15 RMS Power	1200W
IDMAX 15 Impedance Options	Dual 2Ω (D2) or Dual 4Ω (D4)

Woofer Details

The Image Dynamics IDMAX 15 V4 is the driver this enclosure was built around — a 15" subwoofer that delivers the output of a large-format driver without sacrificing the tonal accuracy and transient control that SQ listening demands. With 22mm of one-way linear Xmax, 1200 watts RMS power handling, and a BL factor of 17.36 Tm on the D2 variant, the IDMAX 15 V4 produces deep, high-output bass with the motor authority to stay composed at sustained power levels. Its Qts of 0.48–0.50 places it squarely in sealed alignment territory, making 2.0 cu ft the correct target — the number Image Dynamics engineered around. The IDMAX 15 V4 also features a field-replaceable cone assembly requiring no glue, making long-term serviceability a realistic consideration rather than an afterthought. Full driver specifications are available at imagedynamicsusa.net.

Brand / Model	Image Dynamics IDMAX 15 V4
Size	15"
Impedance Options	Dual 2-ohm (D2) / Dual 4-ohm (D4)
RMS Power	1200W
Peak Power	2400W
Recommended Power Range	300W – 1200W
Xmax (one-way)	22mm
BL Factor (D2)	17.36 Tm
Fs	~30Hz
Qts (D2)	0.48
Qts (D4)	0.50
Vas	~78–85L
Sensitivity	86–88 dB (1W/1m)
Cutout Diameter	14.80"
Outside Diameter	16.22"
Mounting Depth	10.40"
Cone	Glass fiber / pulp composite
Surround	Parabolic Santoprene
Cone Assembly	Field-replaceable — 16 screws, no glue required
Recommended Sealed Volume	2.0 cu ft

Materials

Material

Built From a Spec Sheet, Not a Sales Sheet

Every Proline X Performance Series enclosure is CNC-cut from Langboard Elite MDF — 3/4" (18mm) panels produced to published mill specifications. Most enclosure manufacturers source generic MDF without published data. We can tell you the internal bond rating, the modulus of elasticity, the modulus of rupture, and the face and edge screw holding strength for every panel in this enclosure — because we chose the material based on those numbers, not on price or availability.

Langboard Elite is produced in the United States. The specifications below are pulled directly from Langboard's published mill data and are verifiable. This is the same panel stock used in our full Proline X lineup.

Specifications

Langboard Elite MDF — Published Mill Data

Property	Value	Why It Matters
Panel Stock	Langboard Elite MDF	Named, verifiable panel source — not generic "high-density MDF"
Thickness	3/4" (18mm)	Industry standard for subwoofer enclosures; panels below this flex under pressure
Density	48.5 lbs/ft³	Higher density = less porosity, better screw retention, reduced resonance
Internal Bond	200 psi	Measures resistance to delamination under sustained internal pressure — the most enclosure-relevant spec on this sheet
Modulus of Rupture (MOR)	4,200 psi	Bending strength before the panel breaks — relevant for larger unsupported baffle spans
Modulus of Elasticity (MOE)	410,000 psi	Stiffness under load; higher MOE means less panel flex under bass pressure, less resonance
Face Screw Holding	325 lbs	How firmly the panel surface holds a screw; critical for baffle joint integrity over time
Edge Screw Holding	250 lbs	Panel edge retention — relevant for every joint that isn't face-to-face

Internal Bond

200 psi — The Number That Actually Matters for Enclosures

The internal bond rating measures how well the MDF panel resists delamination under sustained pressure applied perpendicular to the face. In a subwoofer enclosure, every bass transient generates a pressure pulse that pushes outward on every panel simultaneously. A panel that begins to delaminate internally loses stiffness gradually — the symptoms are slow: a box that starts to sound softer, less defined, less punchy over months of use. 200 psi internal bond is the spec that determines how long this enclosure holds its acoustic integrity under daily use at real power levels.

Stiffness

410,000 psi MOE — Less Flex, Less Resonance

The modulus of elasticity measures panel stiffness — resistance to bending under load. A stiffer panel flexes less under the pressure generated by a high-excursion driver at volume. Panel flex is a source of acoustic coloration: the panel itself begins to radiate sound at its own resonant frequency, adding distortion to the output. 410,000 psi stiffness combined with V-groove and dado joinery means the panels stay rigid and the bracing controls resonance at the structure level — not the panel level. The bass you hear comes from the driver, not the box.

Screw Holding

325 lb Face / 250 lb Edge — Joints That Stay Locked

Screw holding strength determines how firmly the panel grips a fastener at the face and at the edge. This matters most at the baffle joint — where the front panel meets the side panels and where the driver is mounted. A panel with low screw holding strength allows fasteners to loosen over time under vibration, leading to air gaps at the joint and loss of acoustic seal. 325 lb face screw holding strength means the baffle hardware stays put. Combined with dado joinery and adhesive, the front panel on a Proline X Performance Series enclosure is not going anywhere.

Sourcing

Named Panel Stock — Not "Premium MDF"

The phrase "premium MDF" or "high-density MDF" appears on marketing copy for enclosures across every price point, from $40 to $400. It is not a specification — it is a description with no defined standard. Langboard Elite is a named, sourced, mill-documented product with published data. We name it in our copy because naming it holds us accountable to the spec. You can look up Langboard Elite independently, verify the numbers on this page, and confirm you are getting what we say you are getting. That is the point.

Why Proline X?

Most enclosures are built to a price point. Proline X is built to a spec. Every box starts with published-data MDF, gets CNC-cut to exact internal volume, and is assembled by hand in our Tennessee facility. The difference shows up in the measurements — and in how the box holds up two years into daily use.

CNC-Cut to Spec

Panels are machine-cut on ShopSabre CNC routers and joined with V-groove and dado joinery. Consistent geometry, no hand-cut variance, no gaps at the joints.