Same motor, same Xmax, same power rating. The difference is cone area: 547 square centimetres on the 12 against 394 on the 10, which is nearly 40 percent more air moved at the same excursion. If you have the space, the 12 is the more capable driver. The 10 exists for builds where the 12 will not physically fit or where the smaller cabinet matters more than the extra output.

Image Dynamics IDMAX 12 Loaded Subwoofer Enclosure (Sealed)

Proline X

Proline-X Sealed 12" Enclosure – Loaded with Image Dynamics IDMAX 12

Q: What comes in this system?

A Proline X sealed enclosure at 1.1 cubic feet net, with the Image Dynamics IDMAX12 V4 already mounted, gasketed and sealed against the baffle. Prewired with 12 gauge OFC to a recessed Proline X terminal cup, polyfill installed. An amplifier, power wire and RCA cables are not included.

Q: How much amplifier power does the IDMAX12 need?

Target 600 to 1000 watts RMS at your final impedance. Image Dynamics recommend 200 to 1000 watts and rate the driver conservatively. Underpowering is the more common mistake here than overpowering. A small amplifier driven into clipping sounds worse and is harder on the voice coil than a larger amplifier running comfortably below its limit.

Q: How does a 1000 watt driver work in a 1.1 cubic foot box?

Because in a sealed cabinet the air spring restricts cone travel, so the driver reaches its thermal limit before it reaches mechanical Xmax at rated power. The enclosure is doing the limiting rather than the motor. High power handling and moderate sealed volume are not in tension the way people assume, and you can see it for yourself by running the numbers through our Xmax calculator.

Q: Will this fit behind a seat?

No. The IDMAX12 needs roughly 8.25 inches of mounting depth, which rules out behind seat and under seat locations. This is a trunk or cargo area driver. If your space is depth limited you want a shallow mount 12 such as the Wavtech thinPRO 12, which fits in 3 inches of mounting depth.

Q: Sealed or ported for an IDMAX?

Sealed is what the IDMAX was designed around. The whole point of the driver is high output that stays composed, and a sealed box is what keeps it composed. Ported will give you more output near the tuning frequency if raw SPL is the goal, and the IDMAX performs well ported, but you trade away the control that is the reason to choose this driver over a dedicated SPL sub.

Q: What does field replaceable cone assembly mean?

Sixteen screws and a set of alignment shims, no glue and no press. If you damage a cone the driver is rebuildable rather than scrap. That is unusual at any price point and is a large part of why the IDMAX holds its value on the used market.

Q: What is the warranty on this system?

The enclosure carries a limited warranty on craftsmanship and materials from Audio Intensity. The Image Dynamics IDMAX12 V4 carries its own 1 year manufacturer warranty separately, handled through Image Dynamics.

SKU: Pro12-S IDMAX D2

QUICK SPECS

Best For: High output builds that still have to sound right
Configuration: Single 12" Sealed — loaded
Volume: 1.1 ft³ Net
Tuning: N/A — Sealed
Sonic Character: Controlled at volume, SPL capable, SQ intent

Proline X Enclosure — Built in Tennessee CNC-cut Langboard Elite 3/4" MDF, V-groove + dado joinery, recessed ABS/Carbon Fiber terminal cup.

Driver + Enclosure — Matched and Pre-Wired Subwoofer pre-installed and wired to the correct impedance. Connect your amplifier and it's ready to run.

Shipping Included No freight charges at checkout on orders to the lower 48. Alaska, Hawaii, and international orders are quoted live rates at checkout.

$ 799.99

Voice Coil Configuration:

Hurry! Only 1 left in stock.

Financing available — choose Shop Pay Installments at checkout.

What's Included

Proline X sealed enclosure, single 12 inch, 1.1 cu ft net
Image Dynamics IDMAX12 V4 subwoofer pre-installed
Pre-wired 12 gauge OFC speaker wire to the terminal cup
Recessed Proline X ABS and carbon fiber terminal cup with stainless hardware and copper ring terminals
Polyfill installed and matched to this volume

Amplifier, power wire and RCA cables are not included.

Proline-X Sealed 12" Enclosure – Loaded with Image Dynamics IDMAX 12

Enclosure Type Sealed

External Dimensions 24" x 14" x 10"

Net Volume 1.1 cubic feetcu ft

Tuning Frequency N/A - Sealed

Cutout Diameter Direct Fit

Front Panel Thickness 1.5"

Max Mounting Depth 8""

INSTALLER'S TAKE

Check your depth. The IDMAX12 needs roughly 8.25 inches of mounting depth, which rules out most behind seat and under seat locations before you start. This is a trunk or cargo area driver. If the space is depth limited you want a shallow mount 12 such as the Wavtech thinPRO 12 instead, and you should decide that before ordering rather than after.

Give it real power. Image Dynamics recommend 200 to 1000 watts and the driver comes alive in the upper half of that range. A small amplifier driven into clipping will sound worse and be harder on the voice coil than a larger amplifier running comfortably. This is one of the few drivers where the usual advice about not overpowering matters less than the advice about not underpowering.

The field replaceable cone assembly is worth knowing about before you ever need it. Sixteen screws and alignment shims, no glue and no press. A damaged cone means a rebuild rather than a replacement driver, which is unusual at any price and is a large part of why the IDMAX holds its value.

Product Details

Proline X Professional Series Enclosure for the Image Dynamics IDMAX12 V4

Cut and tuned for the Image Dynamics IDMAX12 V4

V-Groove and Dado Langboard Elite MDF 1.10 cu ft Net Fits Image Dynamics IDMAX12 V4

1.10cu ft net

1.139system Qtc

35 HzF3 rolloff

8.15 inIDMAX12 V4 mounting depth

Built Around the Image Dynamics IDMAX12 V4

Nothing about this box is generic. Every layer is cut to the IDMAX12 V4's published sealed target, with the baffle bored to the IDMAX12 V4's 11.0 in cutout with threaded inserts matched to the driver's bolt pattern, and clearance cut for its 8.15 in mounting depth.

The IDMAX12 V4 carries a published Fs of 26 Hz, Qts of 0.626 and Vas of 71.89 litres, and an EBP of 36, which puts it in sealed enclosure territory. We ran the alignment math on that data and built the box to land where it belongs.

Net Volume, Not Gross

We build this cabinet at 1.10 cubic feet net. The volume quoted is true net internal airspace, measured after the walls, bracing and driver displacement are accounted for.

True net, not marketing net. Internal volume is calculated by summing each CNC cut layer's opening, not estimated from external dimensions minus wall thickness.

Proline X Professional Series Construction

This enclosure is cut with V-groove and dado joinery on our ShopSabre routers from Langboard Elite 3/4 inch MDF, a dense 48.5 lb/ft³ board with a 200 psi internal bond and 410,000 psi MOE. The panels are V-grooved and folded on the seam and dadoed where the bracing lands. Baffles are double layer minimum, with threaded inserts set to the driver's own bolt pattern.

Double Layer Baffle

The baffle is two layers minimum with threaded inserts matched to the driver's own bolt pattern, so mounting hardware loads into steel rather than into MDF.

Pre-Wired Terminal Cup

Proline X ABS and carbon fiber composite cup with stainless hardware and copper ring terminals, pre-wired internally with 12 gauge OFC. No CCA anywhere in the build.

Damped and Finished

Polyfill is pre-installed to smooth the in box response, and the shell is wrapped in plush black carpet. Built in Tullahoma, Tennessee.

Enclosure Only or Loaded

Order the enclosure bare and mount your own IDMAX12 V4, or order it loaded and we mount the driver, dress the wiring and ship it ready to bolt in.

Sealed Enclosure Performance: Pre-Calculated

Using the published Thiele Small parameters for the Image Dynamics IDMAX12 V4, here is the predicted Qtc, system resonance (Fc) and F3 rolloff for this enclosure. Calculated with the same formulas as the Audio Intensity Sealed Box Calculator.

Image Dynamics IDMAX12 V4 D2 | Qts 0.626 | Fs 26 Hz | Vas 71.89 L

Enclosure Size	Qtc	Fc	F3
1.10 cu ft as built	1.139	47.3 Hz	35.4 Hz

Image Dynamics IDMAX12 V4 Frequency Response | Sealed, 1.10 cu ft

1.10 cu ft (Qtc 1.139) -3dB reference

Note on coil choice: The figures above are the D2 set. The D4 IDMAX12 V4 carries Qts 0.758 and Vas 62.44 litres, which in this same 1.10 cubic foot volume lands at Qtc 1.314, Fc 45.1 Hz and F3 32.4 Hz. Worth accounting for if you are choosing between the two. Run your own numbers in the Sealed Box Calculator.

Cut for the Driver, Not the Catalog

Select your configuration above. This enclosure ships free to the lower 48 with a 2 year limited warranty, built one at a time in Tullahoma, Tennessee. Ordered loaded, the IDMAX12 V4 carries its own 1 year manufacturer warranty through authorized dealers.

Enclosure Specifications

Enclosure	Proline X sealed, loaded
Driver	Image Dynamics IDMAX12 V4, pre-installed
Voice Coil	Dual 2 ohm or Dual 4 ohm
Enclosure Type	Sealed
Net Internal Volume	1.1 ft³ Net
Tuning Frequency	N/A — Sealed
Material	Langboard Elite MDF, 3/4" (18mm)
Driver Mounting Depth	~8.25"
Terminal Cup	Proline X ABS/Carbon Fiber, recessed mount, stainless hardware, copper ring terminals
Wiring	Pre-wired 12g OFC speaker wire
Polyfill	Installed
Built	Tullahoma, Tennessee

Performance Graphs

Woofer Details

The Image Dynamics IDMAX V4 was built to bridge SPL competition subwoofers and high fidelity sound quality drivers, and the IDMAX12 is the size most trunk builds should be looking at. A 400 ounce Extended Y-35 motor, an American made flat wound extended voice coil, a glass fibre and pulp cone with an aluminium neck joint, a Parabolic Santoprene surround and a Nomex spider. Rated at 1000 watts RMS and 1800 watts peak, and Image Dynamics rate conservatively. Xmax is 19.5mm one way, which is where the 39mm peak excursion figure comes from. Cone area is 547.4 square centimetres, nearly 40 percent more than the IDMAX10, which at the same excursion moves substantially more air. Mounting depth is approximately 8.25 inches, so this is a trunk or cargo area driver rather than a behind seat one. The cone assembly is field replaceable: sixteen screws and alignment shims, no glue required. Made in the USA.

Brand + Model	Image Dynamics IDMAX12 V4
Size	12"
RMS Power	1000W
Peak Power	1800W
Recommended Amp Power	200–1000W
Voice Coil Config	Dual 2 ohm or Dual 4 ohm
Voice Coil Diameter	2"
Xmax	19.5mm one-way (39mm peak to peak)
Sensitivity	85 dB
Frequency Response	15–150 Hz
Cone Area (Sd)	547.4 cm²
Mms	213 g
Motor	400 oz Extended Y-35
Mounting Depth	~8.25"
Cone Assembly	Field replaceable, 16 screws, no glue
Recommended Sealed Volume	0.65 to 1.8 ft³
Driver Warranty	1-Year through Image Dynamics

Why This Combo Works

Image Dynamics IDMAX12 V4 in a Proline X 1.1 Cubic Foot Sealed Enclosure

The IDMAX12 is the middle of the IDMAX range and the one most trunk builds should be looking at. It shares the 400 ounce Extended Y-35 motor and 19.5mm of one-way Xmax with the IDMAX10, but adds 547 square centimetres of cone against the 10's 394. At the same excursion that is nearly 40 percent more air moved.

At 1.1 cubic feet net this cabinet sits inside Image Dynamics' published sealed range. A sealed alignment is what the IDMAX was designed around: the whole point of the driver is high output that stays composed, and a sealed box is what keeps it composed. Ported will give you more output near tuning if that is what you are after, but you lose the control that is the reason to buy an IDMAX in the first place.

Worth understanding why a 1000 watt driver lives happily in a cabinet this size. In a sealed box the air spring restricts cone travel, so the driver reaches its thermal limit well before it reaches mechanical Xmax at rated power. The enclosure is doing the limiting, not the motor. High power handling and moderate sealed volume are not in tension the way people assume, and it is visible if you run the numbers through our Xmax calculator.

For amplifier power, target 600 to 1000W RMS at your final impedance. Image Dynamics recommend 200 to 1000 watts and rate conservatively. Underpowering is the more common mistake on this driver than overpowering.

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, its 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.