Proline X Performance Optimized dual sealed enclosure for Arc Series subwoofers, front view of both cutouts.Proline X Performance Optimized dual sealed enclosure for Arc Series subwoofers, angled view of the gloss baffle.Proline X Performance Optimized dual sealed enclosure for Arc Series subwoofers, angled view of both chambers.

Performance Optimized · Datasheet

Performance Optimized Dual Sealed 12" Enclosure | Arc Audio 12" Arc Series 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
0.71–0.80
sealed
Half power
35.6–38.8
Hz · F3
Xmax at
285
W RMS · no filter
With 25 Hz subsonic
401
W RMS · +41%
Amplifier
5–700
W RMS recommended
This enclosure holds 1.40 cu ft net per chamber. In it the Arc Audio ARC Series 12 runs a system Qtc of 0.71–0.80 with half power at 35.6–38.8 Hz, and the cone reaches its 15.0 mm travel limit at 285 W, below the driver’s 350 W thermal rating, so travel is what stops you here, not heat. Run a subsonic filter at 25 Hz and that becomes 401 W — +116 W, or 41 percent more power for the same 15.0 mm of travel.

01Is it a sealed driver?

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

EBP = Fs ÷ Qes = 43.5–48.6
SEALED 0–50 TRANSITION 50–100 PORTED 100–150 0 50 100 150 D2 48.6 D4 43.5
D2 · EBP 48.6D4 · EBP 43.5
EBP under 50 means a motor that wants a sealed load. The ARC Series 12 sits at 43.5–48.6, 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 74.4 L Vas.

α = Vas ÷ Vb = 1.88  ·  Fc = Fs√(α+1) = 39–40 Hz  ·  Qtc = 0.71–0.80
20 30 50 70 100 150 200 +6 +0 -6 -12 -18 -24 FREQUENCY · Hz LEVEL · dB −3 dB
D2 · Qtc 0.71, Fc 39 Hz, F3 38.8 HzD4 · Qtc 0.80, Fc 40 Hz, F3 35.6 Hz
The box lifts resonance from 22.8 Hz free-air to 39–40 Hz and half power lands at 35.6–38.8 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 15.0 mm — and a bigger one once a subsonic filter stops it wasting travel below the passband.

PXmax = 285–295 W unfiltered  →  401–444 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 15.0 mm 285 W reaches Xmax here
D2 · 285 W, no filterD4 · 295 W, no filterD2 · 444 W with subsonic at 25 Hz, 24 dB/octD4 · 401 W with subsonic at 25 Hz, 24 dB/octXmax 15.0 mm one-way
Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 15.0 mm. Unfiltered that is 285 W, reached first at 20 Hz. It sits under the 350 W the driver can take thermally, so the enclosure sets the ceiling, not the voice coil. 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 401 W before hitting the same 15.0 mm. That is 41 percent more amplifier for the price of one filter setting.
ParamValueUnitNote
Fs22.80Hzfree-air resonance
Qts0.416 / 0.468D2 / D4
Vas74.43 / 76.28Lequivalent compliance
Sd470.0cm²effective piston area
Xmax15mmone-way linear travel
Pe350Wcontinuous RMS
SPL84.6dB1 W / 1 m, derived from T/S

Driver parameters as published by arcaudio.com ARC Series owner's manual. Curves computed against this enclosure’s actual net airspace.

Installer's take

The Arc Audio ARC Series is one of those product lines that quietly outperforms its price bracket. It doesn't have the flagship badge of the X2v2 or the shallow-mount novelty of the A-Series, but on real music at real volumes it delivers exactly what most people are actually looking for. Clean output with enough authority to feel it without the sub calling attention to itself. Two of them in a properly sized cabinet is a genuinely serious system. The 2.2 cubic foot common chamber is what makes this work. Arc's spec sheet calls for 0.9 to 1.25 cubic feet per driver sealed. 2.2 cubic feet total for the pair gives each ARC 12 access to 1.1 cubic feet effectively. Right in the middle of Arc's range, where the Qtc target lands where it should for balanced transient response and controlled low end. Not tight to the point of feeling starved, not loose to the point of losing punch. The ARC 12's linear excursion philosophy is the other reason a pair works so well in a common chamber. Arc's engineering team designed these drivers for consistent behavior across the entire excursion range, the cone moves as linearly at 12 millimeters as it does at 3. That linearity translates directly to matched pair behavior in shared airspace. Both drivers respond the same way to the same input, so the pair loads symmetrically without the parameter drift you sometimes see with less-precisely-manufactured drivers. 700 watts RMS combined is the power target. Arc's own XD Series monoblocks in the 700 to 800 watt range are the ideal amplifier match, but any quality monoblock stable at your chosen impedance will get you there. Dual 4-ohm drivers wired in parallel gives you 1 ohm combined, which is where most modern monoblocks are happiest. Dual 2-ohm in series gives you 2 ohms if you prefer the extra headroom. The 32 x 15 x 12 cabinet footprint fits behind most SUV third-row seats or in a mid-size sedan trunk without eating the entire cargo bay. At 45 pounds empty, it's substantial enough that you know the MDF is real, but not so heavy that installing it becomes a two-person job. Add a pair of ARC 12s and you're at roughly 60 pounds loaded, manageable, and worth every ounce. -Scott

Questions

What size enclosure do two Arc Audio ARC Series 12 subwoofers need?

Two Arc Audio ARC Series 12 subwoofers perform best in a 2.2 cubic foot net sealed enclosure. The Audio Intensity Performance Optimized Dual Sealed 12 for Arc Audio ARC 12 delivers exactly 2.2 cubic feet net internal volume in a common chamber, giving each Arc ARC 12 effective access to 1.1 cubic feet of airspace, the middle of Arc Audio's specified sealed range of 0.9 to 1.25 cubic feet per driver.

What are the dimensions of the Performance Optimized Dual Sealed 12 enclosure for the Arc Audio ARC 12?

The Performance Optimized Dual Sealed 12 enclosure for the Arc Audio ARC 12 measures 32" wide x 15" tall x 12" deep externally and weighs 45 pounds unloaded. Net internal volume is 2.2 cubic feet in a common-chamber configuration.51

How much power do two Arc Audio ARC Series 12 subwoofers handle?

Two Arc Audio ARC Series 12 subwoofers handle 700 watts RMS combined. 350 watts RMS per driver. For best results in the Performance Optimized Dual Sealed 12 enclosure, pair the ARC 12 pair with a clean monoblock amplifier delivering 600 to 800 watts RMS at your chosen impedance. Arc Audio XD Series and Mini Series monoblocks in the 700 to 800 watt range are engineered specifically to pair with Arc Audio subwoofers.56

What impedance options are available for the Arc Audio ARC Series 12?

The Arc Audio ARC Series 12 is available in two dual voice coil impedance configurations: Dual 2-ohm (D2) and Dual 4-ohm (D4). Two Dual 2-ohm ARC 12s can wire down to 0.5 ohms parallel or 2 ohms series combined. Two Dual 4-ohm ARC 12s can wire down to 1 ohm parallel or 4 ohms series combined. Dual 4-ohm is the more flexible option for most monoblock amplifier setups.

How much does the Performance Optimized Dual Sealed 12 enclosure weigh?

The Performance Optimized Dual Sealed 12 enclosure for the Arc Audio ARC 12 weighs 45 pounds unloaded. Loaded with two Arc Audio ARC Series 12 subwoofers, total system weight is approximately 60 pounds.

What mounting hardware does the Performance Optimized Dual Sealed 12 for Arc Audio ARC 12 include?

The Performance Optimized Dual Sealed 12 for Arc Audio ARC 12 includes 8/32 threaded inserts pressed into both baffle backsides and stainless steel mounting screws sized for the Arc Audio ARC 12. The enclosure also includes a Proline X ABS/carbon fiber composite terminal cup pre-wired with 12-gauge OFC and stainless steel input hardware.

What carpet and acrylic insert options are available on the Performance Optimized Dual Sealed 12 for Arc Audio ARC 12?

Carpet and insert selections are cosmetic only and do not affect acoustic performance.

Where is the Performance Optimized Dual Sealed 12 for Arc Audio ARC 12 manufactured?

The Performance Optimized Dual Sealed 12 for Arc Audio ARC 12 is manufactured in Tullahoma, Tennessee, USA. Each enclosure is CNC-cut from Langboard Elite 3/4" MDF on ShopSabre routers and hand-assembled at Audio Intensity's Tennessee facility. Build time is 2 to 5 business days from order placement.

Other Performance Optimized models