Performance Optimized Wedge Sealed 15" Audiophile Enclosure | Image Dynamics IDMAX15 V.4

The Image Dynamics IDMAX15 V.4 in an Audiophile-Tuned Sealed Cabinet

The Image Dynamics IDMAX15 V.4 is the largest driver in Image Dynamics' three-size IDMAX platform and the flagship of Image Dynamics' competition-grade lineup. Glass fiber reinforced pressed paper pulp cone, aluminum neck joint for structural integrity under sustained excursion, 575-ounce oversized motor structure, 60mm BASV voice coil former, Nomex spider suspension for thermal survival, parabolic EPDM rubber surround, American-made flat-wound extended voice coil, 2.5-inch voice coil diameter, heavy-duty cast aluminum frame, and Image Dynamics' bolt-on field-replaceable cone assembly (16 screws, no glue, alignment shims included) that turns a blown cone into a rebuild rather than a lost driver. 600 watts RMS continuous power handling, 1200 watts peak, 22mm one-way linear excursion, 934.79 cm² of piston area, dual voice coil in either 2-ohm or 4-ohm configuration. The IDMAX15 is the driver competitors run when the vehicle is large enough to accommodate a serious cabinet and the goal is maximum output paired with the IDMAX platform's SQ-scoring reputation.

The Performance Optimized Wedge Sealed 15 for Image Dynamics IDMAX 15 is engineered to Image Dynamics' Audiophile-tier sealed alignment. 3.26 cubic feet gross internal volume minus the IDMAX15's 0.26 cubic foot total driver displacement lands at exactly 3.00 cubic feet net — direct match to Image Dynamics' published Audiophile sealed spec of 3.0 cu ft for the IDMAX15 platform. This is a serious cabinet for a serious driver. Not a compact-alignment shortcut.

Trunk-Load Wedge Design Explained

This wedge is not a front-firing enclosure. The woofer is mounted on the vertical face that sits at the back of the box, closest to the trunk lid, and fires rearward into the trunk cavity. The angled face is on the opposite side of the box — the side that faces the front of the vehicle — and tucks against the rear seat back. Two different problems solved by one geometry, scaled here for the largest driver in the IDMAX platform and the largest cabinet in the Performance Optimized Wedge line.

Audiophile Alignment Explained | Why 3.0 Cubic Feet Net

Image Dynamics publishes three sealed alignments for the IDMAX15 platform in the V.4 series manual — a Compact alignment (approximately 1.5 cu ft) for maximum power handling in constrained installs, a Universal alignment (approximately 2.0 cu ft) for balanced performance, and the Audiophile alignment (3.0 cu ft) for maximum extension and lowest Qtc in a sealed cabinet. Each alignment produces a different acoustic character with different power handling ceilings and different F3 targets. The Performance Optimized Wedge Sealed 15 is engineered to the Audiophile sealed alignment exactly.

Predicted Alignment at 3.00 Cubic Feet Net

Using Image Dynamics' published Thiele-Small parameters for the IDMAX15 V.4, calculated using the same formulas as the Audio Intensity Sealed Box Calculator, here is what the Audiophile alignment produces for each impedance variant:

Both alignments sit close to classic Butterworth (Qtc 0.707). The D2 produces the flattest, most controlled response the IDMAX15 can deliver in a sealed cabinet. The D4 produces a marginally warmer character with the slight upper-bass lift Qts 0.50 provides at this alignment. Neither variant produces the punchy midbass-forward character of a compact sealed alignment or the deep tuned extension of a properly ported cabinet. What this sealed Audiophile alignment delivers is transient accuracy, musical control, and maximum output capability from the IDMAX platform in a sealed enclosure. The character has kept the IDMAX15 competitive in IASCA and MECA sound quality events for over a decade.

Sealed vs Ported for the IDMAX15

An important honest note on the IDMAX15 specifically: because the driver has a relatively high 30 Hz Fs (versus 27 Hz on the IDMAX10 and 26 Hz on the IDMAX12), sealed F3 stays in the low-to-mid 40s even at the Audiophile 3.0 cu ft alignment. The smaller IDMAX drivers actually reach deeper F3 sealed than the 15. For deep extension below 30 Hz, the IDMAX15 wants a ported alignment — specifically Image Dynamics' Audiophile ported spec of 4.0 cu ft tuned to 27 Hz, which reaches F3 at 27 Hz. That is the configuration that wins IASCA and MECA points on deep-bass-scored tracks. This sealed cabinet is the right answer for musical accuracy, transient control, cabinet manageability compared to a 4.0 cu ft ported enclosure, and installations where the driver's output paired with sealed's control matters more than reaching F3 in the 20s.

D2 vs D4 Selection

The IDMAX15 D2 and D4 have very similar Qts values (0.48 vs 0.50), producing nearly identical Qtc alignments in this cabinet. The character difference is subtle — much more subtle than the D2/D4 differences on the IDMAX12 or IDMAX10. For the IDMAX15, the primary D2/D4 selection driver is impedance compatibility with your amplifier rather than character preference. Read the D2 impedance warning in the wiring section carefully before choosing the D2.

Mounting Geometry and Driver Fitment

The vertical trunk-lid-side baffle is cut to the IDMAX15 V.4's exact 14.80" cutout specification. The IDMAX15's 10.40" mounting depth is the deepest of any driver in the Performance Optimized Wedge line. Internal cabinet clearance behind the driver at cabinet center is approximately 4.05 inches (measured from the vertical baffle interior to the interior of the angled seat-side face at driver-center height, after accounting for 3/4" MDF panel thickness). Adequate room for the IDMAX15's 575-ounce motor structure and 60mm voice coil former assembly.

Performance Series Construction, Built for IDMAX15-Scale Operation

Every panel is cut on ShopSabre CNC routers in our Tullahoma, TN facility. The angled seat-side panel requires precise CNC compound cuts to hit both the 3.0 cu ft net Audiophile alignment target and the mating angles between the top and bottom edges. Internal volume is verified on every unit to ensure the Audiophile alignment target is achieved.

Weight and Installation Notes

This cabinet is genuinely heavy. The IDMAX15 driver itself is 44 pounds. The empty cabinet weighs approximately 65 pounds in Langboard MDF at this size. Loaded system weight is approximately 109 pounds. This is a two-person install. Standard parcel shipping via UPS ground is typically capped at 150 pounds per package but oversize surcharges apply — expect either freight shipping or heavy-parcel handling depending on your delivery location. Confirm your vehicle's trunk load capacity and the physical clearance to get the loaded cabinet through the trunk opening before ordering.

Customize Your Build

Carpet Finish

Dark Gray Trunkliner is the standard durable wrap, matched to most factory trunk and cargo-area carpet tones. Plush Black (+$10) is a deeper, more luxurious nap that pairs well with blacked-out interiors and show builds.

Acrylic Insert Color

Choose Black, Blue, Red, or White for the baffle insert to match your build. Or skip the insert entirely (-$40) for a clean, understated look. The insert is purely cosmetic — performance is identical across colors.

Enclosure Only

This listing is for the enclosure only. Drop in your existing Image Dynamics IDMAX15 V.4 D2 (Dual 2-ohm) or IDMAX15 V.4 D4 (Dual 4-ohm) subwoofer — the cabinet fits both variants identically. Source your driver from Image Dynamics or an authorized ID dealer.

Wiring the Image Dynamics IDMAX15 V.4 to Your Amplifier

The IDMAX15 V.4 is a dual-voice-coil driver available in two impedance configurations. The pre-wired terminal cup accepts the two-conductor connection via 10-gauge OFC, with stainless steel input hardware accepting both spade and banana terminations.

IDMAX15 V.4 D2 (Dual 2-ohm) — Read Before Wiring: The IDMAX15 D2 has DC resistance of 1.4 ohms per coil. Wired in parallel, the combined DC-measured load is approximately 0.7 ohms — meaningfully below the 1-ohm stable rating of nearly all modern class D monoblocks. This is not the 0.83-ohm parallel measurement on the IDMAX12 D2 that some amps tolerate; the IDMAX15 D2 parallel is a hard "no" for most amplifiers and will trigger protection modes on many designs marketed as 1-ohm stable. Wire the D2 in series for a 4-ohm load unless your amplifier is explicitly rated for sub-1-ohm operation and specifies minimum impedance below 1 ohm in the actual specification sheet (not the marketing materials). Series wiring at 4 ohms is compatible with essentially all high-quality class D monoblocks.

IDMAX15 V.4 D4 (Dual 4-ohm): Parallel wiring presents a 2-ohm load — compatible with all 1-ohm stable class D monoblocks operating at 2 ohms. Series wiring presents 8 ohms. The D4 is the easier match for standard mainstream amplifiers, especially given the D2's problematic parallel measured impedance. Given the very similar Qtc alignments the D2 and D4 produce in this cabinet, the D4 is often the practical choice unless you have a specific amplifier rated for sub-1-ohm operation and want the D2's slightly deeper F3 in parallel.

The IDMAX15 is rated for 600 watts RMS continuous with 1200 watts peak. In the Audiophile 3.0 cu ft alignment, reduced air-spring loading allows greater cone excursion at the same input power compared to a compact-cabinet alignment — plan for 500-800 watts RMS input from a well-regulated class D monoblock. The Rockford Fosgate T1000-1bdCP (1000W at 1 ohm) is the factory-scale amplifier match at 2 ohms with the D4 or 4 ohms with the D2 in series. Set your amplifier's active low-pass filter between 70 and 90 Hz for musical accuracy in a full-range system. Subsonic filter around 20-25 Hz to protect the mechanical suspension at frequencies well below the alignment's Fc.

Built in Tennessee, Backed by Audio Intensity

Every Performance Optimized enclosure is CNC-cut, assembled, and finished in our Tullahoma, TN facility. Components are pulled from inventory after your order is placed, then bonded and wrapped — a 3 to 7 business day assembly window before this cabinet ships (longer than the smaller PO Wedge builds due to the additional MDF panels, bracing, and finish surface area). No pre-built inventory sitting in warehouses, warping in storage. Each unit is built to order.

Backed by a 1-year limited warranty against structural failure and hardware defects on the enclosure. Your Image Dynamics IDMAX15 V.4 subwoofer is covered by Image Dynamics' 1-year manufacturer warranty when purchased through an authorized ID dealer. Questions on fitment, wiring, or amplifier pairing? Contact us — we install this gear ourselves, in our own vehicles, and Audio Intensity's owner has judged IASCA National and MECA World SQ competitions since 2019.