Alpine Proline PO 10-S W R2 woofers shown in a black acrylic enclosure with a circular opening, labeled as 15 by 13 inches, on a dark blue background with product specifications and branding.

A performance-optimized Alpine R2-W series car subwoofer enclosure by Proline, shown as a dark gray wedge-shaped cabinet with dimension labels (15 inches tall, 13.1 inches wide, 6.

Performance Optimized Wedge Sealed 10" Enclosure | Alpine R2-W10 Single 10" Sealed enclosure

Net volume: 0.50 Cubic Feet
Max mounting depth: 6.9 Inches (Alpine Spec)
Cutout: 9.17 Inches (Alpine Spec)
External dimensions: 15 Inches W × 13 Inches H × 7.7 Inches / 12.4 Inches D
Front baffle: Vertical Trunk-Lid-Side Woofer Mounting Face

Best For: Alpine R2-W10 Trunk-Fit Daily Driver Builds
Net Volume: 0.50 cu ft (0.58 cu ft Gross)
Driver Match: Alpine R2-W10 (D2 or D4)
Construction: Rear-Firing Wedge | V-Groove/Dado | Double 1.5" Baffle | Threaded Inserts

Technical specifications

Enclosure Type	Sealed \| Wedge Geometry \| Rear-Firing Trunk-Load
Driver-Specific Fitment	Alpine R2-W10 - R2-W10D2 (DVC 2Ω) or R2-W10D4 (DVC 4Ω)
Internal Volume (Gross)	0.58 Cubic Feet
Internal Volume (Net After Displacement)	0.50 Cubic Feet
Target System Qtc (D2)	0.71 (Butterworth \| Based on Published T/S)
Target System Qtc (D4)	0.73 (Butterworth \| Based on Published T/S)
Predicted F3	~47 Hz (Both Coils)
Predicted Fc	~47-48 Hz
Driver Displacement	0.08 Cubic Feet (Published by Alpine)
Baffle Configuration	Vertical Trunk-Lid-Side Woofer Mounting Face
Material	Langboard Elite 3/4" MDF
Front Baffle Construction	Double-Layer 1.5" MDF (Two 3/4" Sheets Bonded)
Joinery	V-Groove and Dado (CNC-Cut)
Construction	ShopSabre CNC / Angled Seat-Side Compound Cuts / Perimeter Cross-Brace
External Width	15 Inches
External Height	13 Inches
External Depth (Top)	7.7 Inches
External Depth (Bottom)	12.4 Inches
Baffle Angle	~20° From Vertical (Seat-Side Face)
Mounting Hole Diameter	9.17 Inches (Alpine Spec)
Mounting Depth Required	6.9 Inches (Alpine Spec)
Mounting Hardware	8/32 Threaded Inserts \| Stainless Steel Machine Screws Included
Terminal Cup	Proline X ABS/Carbon Fiber Composite \| 12g OFC Pre-Wired
Damping	Polyfill Pre-Installed
Recommended Power	500-750 Watts RMS (Alpine Rated: 750W RMS Continuous)
Carpet Finish	Dark Gray Trunkliner (Standard) or Plush Black
Acrylic Insert	Black, Blue, Red, White, or None
Bundle Options	Enclosure Only (Bring Your Own R2-W10D2 or R2-W10D4)
Warranty	1-Year Limited (Enclosure)
Manufactured	Tullahoma, Tennessee, USA

Performance in this enclosure

Net airspace

0.50

cu ft per chamber

System Qtc

0.71–0.73

sealed

Half power

46.6–47.2

Hz · F3

Xmax at

912

W RMS · no filter

With 25 Hz subsonic

1214

W RMS · +33%

Amplifier

750

W RMS recommended

This enclosure holds 0.50 cu ft net per chamber. In it the Alpine R2-W10D2 runs a system Qtc of 0.71–0.73 with half power at 46.6–47.2 Hz, and the cone reaches its 20.0 mm travel limit at 912 W, above the driver’s 750 W thermal rating, so heat stops you before travel does. Run a subsonic filter at 25 Hz and that becomes 1214 W — +302 W, or 33 percent more power for the same 20.0 mm of travel.

01Is it a sealed driver?

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

EBP = Fs ÷ Qes = 61.5–62.0

D2 · EBP 62.0D4 · EBP 61.5

At 61.5–62.0 the R2-W10D2 sits in the transition band, not the sealed band. That is not a mismatch: a transition motor works in either alignment, and sealed buys a smaller box and a gentler roll-off at the cost of some low-end output. Stage 02 shows what this airspace actually does with it.

02What the box does to it

0.50 cu ft against a 18.2 L Vas.

α = Vas ÷ Vb = 1.29 · Fc = Fs√(α+1) = 47–48 Hz · Qtc = 0.71–0.73

D2 · Qtc 0.71, Fc 47 Hz, F3 46.6 HzD4 · Qtc 0.73, Fc 48 Hz, F3 47.2 Hz

The box lifts resonance from 31.0 Hz free-air to 47–48 Hz and half power lands at 46.6–47.2 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 20.0 mm — and a bigger one once a subsonic filter stops it wasting travel below the passband.

P_Xmax = 912–962 W unfiltered → 1214–1232 W with a 25 Hz subsonic

D2 · 912 W, no filterD4 · 962 W, no filterD2 · 1214 W with subsonic at 25 Hz, 24 dB/octD4 · 1232 W with subsonic at 25 Hz, 24 dB/octXmax 20.0 mm one-way

Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 20.0 mm. Unfiltered that is 912 W, reached first at 20 Hz. It sits above the 750 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 1214 W before hitting the same 20.0 mm. That is 33 percent more amplifier for the price of one filter setting.

Param	Value	Unit	Note
Fs	31.00	Hz	free-air resonance
Qts	0.470 / 0.480		D2 / D4
Vas	18.20 / 18.20	L	equivalent compliance
Sd	333.0	cm²	effective piston area
Xmax	20	mm	one-way linear travel
Pe	750	W	continuous RMS
SPL	82.2	dB	1 W / 1 m, derived from T/S

Driver parameters as published by Alpine R2-W Thiele-Small sheet CN_TS_R2-W (2022). Curves computed against this enclosure’s actual net airspace.

Installer's take

The Alpine R2-W10 is one of the cleanest driver alignments I've built a wedge around this year. Both the D2 and D4 coil variants land essentially at Butterworth in the same 0.50 cubic foot net cabinet - D2 at Qtc 0.71 and D4 at Qtc 0.73. That's rare. Most dual-impedance drivers have T/S spread that forces a design compromise. This one does not.

The R2-Series driver itself is Alpine's flagship woofer platform. Reinforced parabolic cone in pulp/Kevlar composite, high-amplitude multi-roll Santoprene surround, progressive spider with reinforced tinsel leads, and a 65.5mm 4-layer voice coil on an aluminum former. The motor uses double-stacked strontium ferrite with compound-radius extended pole geometry - all Alpine patents, all doing real work. 20mm Xmax, 70mm mechanical travel, 750W RMS continuous. This is a serious musical driver disguised as a mainstream option.

The double-baffle 1.5" front is not optional. The R2-W10's cast aluminum frame plus 20mm Xmax puts real mechanical load into the mounting flange at high output, and a single 3/4" layer will telegraph flex back into the cone. Two bonded 3/4" layers with the CNC-precision cutout stops that entirely.

If you're bringing your own amp, target 500-750 watts RMS at the woofer's final impedance. The R2-W10's 8AWG push terminals with VC configuration jumpers let you wire the dual voice coils in series or parallel right at the driver, without needing external jumpers. The terminal cup on this enclosure provides the final connection to your amp.

Questions

Will this enclosure fit both the R2-W10D2 and R2-W10D4?

Yes. Direct-fit for either impedance option. Both coils land essentially at Butterworth in this cabinet (Qtc 0.71-0.73), unusually clean for a dual-impedance driver family.

Why did you pick 0.50 cubic feet net?

0.50 cubic feet net was selected to hit Butterworth on both R2-W10 coil variants. Based on Alpine's published T/S data, D2 lands Qtc 0.71 and D4 lands Qtc 0.73 - both essentially maximally flat. Matches Alpine's own recommended sealed volume.

What amplifier power should I run to this enclosure?

Alpine R2-W10 is rated 750W RMS continuous. Target 500-750W RMS at the woofer's final wired impedance for a clean musical system.

How does a wedge enclosure improve the sound in a trunk installation?

The wedge geometry angles the driver rear-firing into the trunk at approximately 20 degrees from vertical.

Why is the front baffle double-layered on this enclosure?

Double-layer 1.5 inch front baffle from bonded 3/4 inch Langboard Elite MDF. Given the R2-W10's 20mm Xmax and 750W rating, the double baffle eliminates flex under high mechanical load.

What is the expected low-frequency extension of this enclosure?

At Qtc 0.71-0.73 Butterworth alignment, predicted -3 dB is approximately 47 Hz for both coils. Cabin gain extends effective in-car response into the upper 20 Hz range.

Do I need to add any additional damping or polyfill to this enclosure?

No additional damping required. Polyfill is pre-installed to the correct density for the volume and alignment.

Is the Alpine R2-W10 subwoofer included with this enclosure?

No. Enclosure only. Bring your own R2-W10D2 (DVC 2Ω) or R2-W10D4 (DVC 4Ω) driver.

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