Performance Optimized Dual Sealed 10-inch Enclosure Image Dynamics IDQ 10 - Proline X Subwoofer Enclosures for car audio systems

Performance Optimized · Datasheet

Performance Optimized Dual Sealed 12" Enclosure | Image Dynamics IDQ 12 Dual 12" Sealed enclosure

Net volume
Approx. 2.8 cu ft total (approx. 1.4 cu ft per driver)
Max mounting depth
5.91" (IDQ12 V4) with generous clearance
Cutout
10.87" (276mm) x 2, matched to IDQ12 V4
External dimensions
30" x 15" x 15"
Buy at Audio Intensity
  • Best For: Dual Image Dynamics IDQ12 V4 SQ Builds
  • Tuning: Sealed, Common Chamber, Extended SQ Alignment
  • Net Volume: Approx. 2.8 cu ft (1.4 cu ft per driver)
  • Construction: V-Groove + Dado, Langboard Elite MDF, CNC-Cut in TN

Technical specifications

SeriesProline X Performance Optimized
SKUPO ID 12D-S IDQ
Designed ForTwo Image Dynamics IDQ12 V4 subwoofers (D2 or D4)
Enclosure TypeSealed, common chamber
Net Internal VolumeApprox. 2.8 cu ft total (approx. 1.4 cu ft per driver)
External Dimensions (W x H x D)30" x 15" x 15"
Cutout Diameter10.87" (276mm) x 2, matched to IDQ12 V4
Driver Mounting Depth Supported5.91" (IDQ12 V4) with generous clearance
System Power Handling1000 watts RMS (2 x 500W IDQ12 V4)
MaterialLangboard Elite MDF, 3/4"
JoineryPrecision V-groove and dado, CNC-cut on ShopSabre routers
Driver Mounting8/32 threaded inserts with stainless steel machine screws (included)
TerminalProline X ABS/carbon fiber composite cup, stainless hardware, copper ring terminals
Internal Wiring12-gauge OFC, pre-wired to both driver positions
DampingPolyfill pre-installed
Carpet OptionsDark Gray Trunkliner (standard) / Plush Black
Acrylic Insert OptionsBlack, Blue, Red, White, or None
Bundle OptionsBox Only / Add pair of IDQ12 V4 Dual 2-ohm / Add pair of IDQ12 V4 Dual 4-ohm
Built InTullahoma, Tennessee, USA
Warranty1-Year Limited

Performance in this enclosure

Net airspace
1.40
cu ft per chamber
System Qtc
1.02–1.10
sealed
Half power
39.3–39.6
Hz · F3
Xmax at
492
W RMS · no filter
With 25 Hz subsonic
510
W RMS · +4%
Amplifier
375
W RMS recommended
This enclosure holds 1.40 cu ft net per chamber. In it the Image Dynamics IDQ12 V4 runs a system Qtc of 1.02–1.10 with half power at 39.3–39.6 Hz, and the cone reaches its 14.5 mm travel limit at 492 W, above the driver’s 375 W thermal rating, so heat stops you before travel does. Run a subsonic filter at 25 Hz and that becomes 510 W — +18 W, or 4 percent more power for the same 14.5 mm of travel.

01Is it a sealed driver?

Efficiency bandwidth product places the motor before anything else is decided.

EBP = Fs ÷ Qes = 40.3–43.3
SEALED 0–50 TRANSITION 50–100 PORTED 100–150 0 50 100 150 D2 43.3 D4 40.3
D2 · EBP 43.3D4 · EBP 40.3
EBP under 50 means a motor that wants a sealed load. The IDQ12 V4 sits at 40.3–43.3, inside that band, which is why this is a sealed build rather than a ported one.

02What the box does to it

1.40 cu ft against a 48.6 L Vas.

α = Vas ÷ Vb = 1.23  ·  Fc = Fs√(α+1) = 51–52 Hz  ·  Qtc = 1.02–1.10
20 30 50 70 100 150 200 +6 +0 -6 -12 -18 -24 FREQUENCY · Hz LEVEL · dB −3 dB
D2 · Qtc 1.02, Fc 51 Hz, F3 39.6 HzD4 · Qtc 1.10, Fc 52 Hz, F3 39.3 Hz
The box lifts resonance from 34.0 Hz free-air to 51–52 Hz and half power lands at 39.3–39.6 Hz, anechoic, before any cabin gain. This enclosure ships without a driver, so both coil variants the maker offers are plotted. They do not load the same box the same way.

03The watts that reach Xmax (in this enclosure)

Travel scales with the square root of power, so there is one wattage that puts the cone exactly on 14.5 mm — and a bigger one once a subsonic filter stops it wasting travel below the passband.

PXmax = 492–502 W unfiltered  →  510–513 W with a 25 Hz subsonic
20 30 50 70 100 150 200 0 4 8 12 16 FREQUENCY · Hz CONE TRAVEL · mm PAST LINEAR TRAVEL · Xmax 14.5 mm 492 W reaches Xmax here
D2 · 492 W, no filterD4 · 502 W, no filterD2 · 510 W with subsonic at 25 Hz, 24 dB/octD4 · 513 W with subsonic at 25 Hz, 24 dB/octXmax 14.5 mm one-way
Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 14.5 mm. Unfiltered that is 492 W, reached first at 37 Hz. It sits above the 375 W the driver can take thermally, so the voice coil gives up before the suspension does. The dashed traces are the same driver behind a subsonic filter at 25 Hz, 24 dB/oct: stopping the cone wasting travel below the passband lets it take 510 W before hitting the same 14.5 mm. That is 4 percent more amplifier for the price of one filter setting.
ParamValueUnitNote
Fs34.00Hzfree-air resonance
Qts0.681 / 0.740D2 / D4
Vas48.57 / 47.22Lequivalent compliance
Sd510.7cm²effective piston area
Xmax14.5mmone-way linear travel
Pe375Wcontinuous RMS
SPL85.7dB1 W / 1 m, derived from T/S

Driver parameters as published by imagedynamicsusa.net. Curves computed against this enclosure’s actual net airspace.

Installer's take

The IDQ12 V4 has been on my short list of SQ twelves for years, and a pair of them in the right sealed box is one of my favorite bass stages, period. The operative phrase is "the right box." The IDQ rewards correct airspace more than almost any driver I work with, which is exactly why we cut this enclosure around its published parameters instead of selling you a generic dual 12. The 2.8 cubic foot common chamber puts each driver in roughly 1.4 cubic feet, the extended end of the IDQ12's sealed window. Compared to the tighter 1.0 alignment, you give up a hair of punch and gain real extension, and with two 12s sharing the work, excursion per driver stays low and the bass stays effortless. With an EBP of 40, this driver was never going in a ported box anyway; sealed is its home and this is the airspace. Build details matter at this level. The threaded inserts match the IDQ's bolt pattern, so the drivers torque down properly and come back out cleanly when you want to show off that field-replaceable cone system. The terminal cup is pre-wired in 12-gauge OFC to both positions, so your only job is landing the amp leads and deciding on final impedance: a pair of Dual 2-ohm drivers lands at 2 ohms, a pair of Dual 4-ohm drivers gives you 1 ohm or 4. Power-wise, this stage wants 1000 clean watts. A Wavtech link1000.1mini on a 2-ohm pair is a tidy match, and the link1500.1plus covers a 1-ohm Dual 4 configuration with headroom. Feed it clean power, keep the gains honest, and a dual IDQ12 sealed stage will blend into a front stage like it is not even back there. That is the whole point. -Scott

Questions

What subwoofers is the Performance Optimized Dual Sealed 12 enclosure designed for?

The Performance Optimized Dual Sealed 12 (PO ID 12D-S IDQ) is engineered specifically for two Image Dynamics IDQ12 V4 subwoofers, in either Dual 2-ohm or Dual 4-ohm voice coil configurations. The internal volume, 10.87 inch baffle cutouts, and 8/32 threaded insert mounting pattern are all matched to the IDQ12 V4's published specifications rather than averaged across a class of 12-inch drivers.

How much airspace does each IDQ12 V4 get in this enclosure?

The enclosure provides approximately 2.8 cubic feet of net internal volume in a shared common chamber, which works out to approximately 1.4 cubic feet per driver after subwoofer displacement. That places each IDQ12 V4 in the extended portion of Image Dynamics' recommended sealed range, favoring deeper bass extension while preserving the transient accuracy the IDQ Series is known for. Polyfill comes pre-installed.

Why is this a common chamber instead of two separate chambers?

The Performance Optimized dual enclosures use a single shared chamber because two identical drivers fed the same signal in matched airspace behave as one acoustic system, and the common chamber maximizes usable net volume from the cabinet's footprint. The IDQ12 V4's consistent manufacturing tolerances make it well suited to shared-chamber operation.

Will the Image Dynamics IDQ12 V4 bolt directly into this enclosure?

Yes. The baffle carries 8/32 threaded inserts matched to the IDQ12 V4's published mounting hole pattern, and stainless steel machine screws are included. The 10.87 inch cutouts match the IDQ12 V4's specified cutout diameter, and the enclosure's 15 inch depth clears the driver's 5.91 inch mounting depth with room to spare.

How do I wire two IDQ12 V4 subwoofers and what final impedance will I get?

It depends on the voice coil version. A pair of IDQ12 V4 Dual 2-ohm subwoofers wires to a 2-ohm final load. A pair of IDQ12 V4 Dual 4-ohm subwoofers wires to either 1 ohm (all coils in parallel) or 4 ohms (series-parallel). The enclosure's Proline X terminal cup is pre-wired with 12-gauge OFC to both driver positions, so you only connect the amplifier leads and set the coil wiring at the drivers.

What amplifier should I use with two IDQ12 V4 subwoofers?

The pair handles 1000 watts RMS combined (500 watts each), so target a clean amplifier in the 700 to 1000 watt range at your final impedance. A Wavtech link1000.1mini delivers 1000 watts at 2 ohms for a Dual 2-ohm pair, and a Wavtech link1500.1plus covers a 1-ohm Dual 4-ohm configuration with its dual rail power supply. Clean, well-regulated power matters more to the IDQ12 than big peak numbers.

What are the carpet and acrylic insert options?

The acrylic insert is cosmetic and does not affect acoustic performance.

Can I buy this enclosure loaded with the subwoofers?

Yes. The Performance Optimized Dual Sealed 12 is available as the box only, or bundled with a matched pair of Image Dynamics IDQ12 V4 subwoofers in your choice of Dual 2-ohm or Dual 4-ohm. Bundled orders ship together from our facility in Tullahoma, Tennessee, and the enclosure carries a 1-year limited warranty.

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