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Proline X PO 10-S DFW RSW sealed down-fire wide enclosure for the Alpine RSW10, 41 inches wide by 4.75 inches tall, feet add 1.75 inches of height.
Proline X PO 10-S DFW RSW sealed down-fire wide enclosure, end panel with side-mounted terminal cup, 4.75 inches tall by 12 inches deep.

Performance Optimized · Datasheet

Performance Optimized Down Fire Wide Sealed 10" Shallow Sub Enclosure Alpine RSW10 · Single 10" Sealed enclosure

Net volume
0.539 cu ft after displacement
Max mounting depth
3.25 in
External dimensions
41 in W × 4.75 in in the down fire position H × 12 in D
Front baffle
1.5 in double baffle, outer layer machined as a flush recess
Buy at Audio IntensityFactory-direct, ships from Tullahoma
Alpine RS-W10Buy at Audio Intensity
  • Alignment: 0.539 cu ft net. D2 Qtc 1.457, Fc 46.0 Hz, F3 32.3 Hz; D4 Qtc 1.893, Fc 49.3 Hz, F3 33.4 Hz; height set by motor clearance
  • Down Fire Wide: 41"W x 12"D x 4.75"H in down fire position, 3" shallower and 11" longer than the standard 30 x 15, for under rear seats and narrow cargo floors
  • Driver: Alpine RS-W10D2 (DVC 2 ohm) or RS-W10D4 (DVC 4 ohm), 600W RMS / 1800W peak, 20mm Xmax, 0.04 cu ft displacement, neodymium motor
  • Build: Windowed U-brace, 1.5" double baffle, one side-mounted terminal cup, 12g OFC
  • Feet: 1.75", ship uninstalled. Installed height 6.5"

Spec of record

Technical specifications

SeriesProline X Performance Optimized Down Fire Wide
Compatible DriverAlpine RS-W10D2 (DVC 2 ohm) or RS-W10D4 (DVC 4 ohm). Direct fit
Enclosure TypeSealed, single driver, down fire, floor coupled
Intended FitmentUnder the rear seat of trucks and SUVs and narrow cargo floors, where depth is the limiting dimension
Firing DirectionDown firing, driver fires toward the floor. Feet ship uninstalled, so front or up firing is also possible
Chamber ConfigurationSingle sealed chamber, windowed U-brace, one side-mounted terminal cup
External Width41 in
External Depth12 in
External Height4.75 in in the down fire position, excludes feet
Installed Height6.5 in with the 1.75 in feet
Standard 30 x 15 Equivalent30 x 15 x 4.75 in, 0.50 cu ft net. Same driver, deeper and shorter footprint
Internal Volume, Gross0.585 cu ft
Net Volume0.539 cu ft after displacement
Height Set ByDriver clearance: the 3.25 in motor, 0.75 in minimum above it
Clearance Above Motor0.75 in
Alignment, D2Qtc 1.457, Fc 46.0 Hz, F3 32.3 Hz anechoic
Alignment, D4Qtc 1.893, Fc 49.3 Hz, F3 33.4 Hz anechoic
Woofer Opening9-5/8 in / 243mm, Alpine spec
Mounting Depth3.25 in
Driver Fs30.00 Hz (D2) / 31.00 Hz (D4)
Driver Qts0.950 (D2) / 1.190 (D4)
Driver Vas20.64 L (D2) / 23.35 L (D4)
Driver Cone Area (Sd)380 cm2
Driver Xmax (One-Way)20mm
Driver Xmech (Peak-to-Peak)54mm
Driver Voice Coil4 in, high-temp
Driver MotorHigh-grade neodymium, DD Linear dual magnetic gap
Driver Power Handling600 W RMS / 1800 W peak
Recommended Power500 to 600 W RMS
Voice Coil ConfigurationDual voice coil, final impedance set at the driver
Driver Displacement0.04 cu ft, published by Alpine
MaterialLangboard Elite MDF
ConstructionCNC cut on ShopSabre routers, V-groove and dado joinery
Panel Thickness0.75 in
Front Baffle1.5 in double baffle, outer layer machined as a flush recess
Internal BracingWindowed U-brace, dadoed to the shell
Corner ProfileSquare, Down Fire series standard
Driver Mounting8/32 threaded inserts, stainless machine screws included
Terminal CupOne Proline X ABS and carbon fiber composite, side mounted
Internal Wiring12 gauge OFC
FeetIncluded, 1.75 in, shipped uninstalled
DampingPolyfill pre-installed as a light wall lining
CarpetPlush Black
Bundle OptionsEnclosure only, bring your own RS-W10D2 or RS-W10D4
Warranty1 Year Limited
Built InTullahoma, Tennessee

Modelled response

Performance in this enclosure

Net airspace
0.539
cu ft per chamber
System Qtc
1.46–1.89
sealed
Half power
32.3–33.4
Hz · F3
Xmax at
950
W RMS · no filter
With 25 Hz subsonic
957
W RMS · +1%
Amplifier
500–600
W RMS recommended
This enclosure holds 0.539 cu ft net per chamber. In it the Alpine RS-W10D2 runs a system Qtc of 1.46–1.89 with half power at 32.3–33.4 Hz, and the cone reaches its 20.0 mm travel limit at 950 W, above the driver’s 600 W thermal rating, so heat stops you before travel does. A 25 Hz subsonic filter adds little here: 957 W against 950 W, 1 percent. The box already resonates at 46–49 Hz, so its own rolloff has removed most of what the filter would have stopped.

01Is it a sealed driver?

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

EBP = Fs ÷ Qes = 18.7–27.0
SEALED 0–50 TRANSITION 50–100 PORTED 100–150 0 50 100 150 D2 27.0 D4 18.7
D2 · EBP 27.0D4 · EBP 18.7
EBP under 50 means a motor that wants a sealed load. The RS-W10D2 sits at 18.7–27.0, inside that band, which is why this is a sealed build rather than a ported one.

02What the box does to it

0.539 cu ft against a 20.6 L Vas.

α = Vas ÷ Vb = 1.35  ·  Fc = Fs√(α+1) = 46–49 Hz  ·  Qtc = 1.46–1.89
20 30 50 70 100 150 200 +6 +0 -6 -12 -18 -24 FREQUENCY · Hz LEVEL · dB −3 dB
D2 · Qtc 1.46, Fc 46 Hz, F3 32.3 HzD4 · Qtc 1.89, Fc 49 Hz, F3 33.4 Hz
The box lifts resonance from 30.0–31.0 Hz free-air to 46–49 Hz and half power lands at 32.3–33.4 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 in this alignment a subsonic filter barely moves it.

PXmax = 950–962 W unfiltered  →  957–982 W with a 25 Hz subsonic
20 30 50 70 100 150 200 0 8 16 24 FREQUENCY · Hz CONE TRAVEL · mm PAST LINEAR TRAVEL · Xmax 20.0 mm 950 W reaches Xmax here
D2 · 962 W, no filterD4 · 950 W, no filterD2 · 982 W with subsonic at 25 Hz, 24 dB/octD4 · 957 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 950 W, reached first at 45 Hz. It sits above the 600 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, and they sit almost on top of the solid ones: 957 W against 950 W. At 46–49 Hz the filter sits well below resonance, where the sealed alignment has already rolled the cone off at 12 dB/oct, so there is little wasted travel left for it to recover. Set it anyway to keep road rumble out of the cone, but do not size the amplifier around it.
ParamValueUnitNote
Fs30.00 / 31.00Hzfree-air resonance
Qts0.950 / 1.190D2 / D4
Vas20.64 / 23.35Lequivalent compliance
Sd380.0cm²effective piston area
Xmax20mmone-way linear travel
Pe600Wcontinuous RMS
SPL78.9dB1 W / 1 m, derived from T/S

Driver parameters as published by Alpine R-Series Shallow application guide. Curves computed against this enclosure’s actual net airspace.

From the shop floor

Installer's take

Same height as our shortest Down Fire cabinet, 4.75 inches, but 12 inches deep instead of 15. If your under-seat space is shallow as well as low, this is the one.

Height here is set by the motor, not the airspace. The RS-W10 mounts in 3.25 inches and needs 0.75 inch above the magnet, so the cabinet cannot go lower, and at that height the wide footprint holds 0.539 cubic feet net, a little more than the 0.50 the standard box was built to. That nudges Qtc down to 1.457 on the D2 and 1.893 on the D4. More air is the safe direction.

Neodymium is why it works at all. Alpine publishes 0.04 cubic feet of displacement, so nearly the whole cavity is usable air. 600 watts RMS, 20mm of one-way excursion, 54mm peak-to-peak.

Dual voice coil in 2 or 4 ohm. Set your final impedance at the driver. Target 500 to 600 watts RMS.

Before you order

Questions

Why is this cabinet 41 inches wide instead of 30?

Because it is only 12 inches deep. The standard Performance Optimized Down Fire platform is 30 wide by 15 deep, and under a rear seat or on a narrow cargo floor there is often not 15 inches to give.

The airspace lost from the depth is recovered from the length, so the cabinet runs 41 inches instead of 30 and stands 4.75 inches tall, with the same driver specific chamber. If you do have 15 inches of depth, the standard 30 by 15 cabinet is the better pick.

How does this compare to the standard 30 x 15 RS-W10 enclosure?

The standard cabinet is 30 by 15 by 4.75 inches and gives the driver 0.50 cubic feet net. This one is 41 by 12 by 4.75 inches and gives the driver 0.539 cubic feet net. Here the height is set by the 3.25 inch motor's clearance rather than the airspace, so the wide box carries more air, which lowers Qtc slightly.

The choice is about shape: the standard box if you have 15 inches of depth, this one when depth is the limit and you have 41 inches of run.

Should I choose the RS-W10D2 or the RS-W10D4?

In 0.539 cubic feet net the RS-W10D2 lands at Qtc 1.457 with Fc at 46.0 Hz and F3 at 32.3 Hz, and the RS-W10D4 at Qtc 1.893 with Fc at 49.3 Hz and F3 at 33.4 Hz. The D2 is the better damped of the two; the D4 carries more lift near the corner.

Pick the coil that suits your amplifier's stable load. The cabinet is direct fit for either.

How do I wire this enclosure and set my impedance?

Both RS-W10 versions are dual voice coil. The D2 wires to 1 ohm with the coils in parallel or 4 ohms in series, and the D4 to 2 ohms parallel or 8 ohms series; Alpine's application guide covers every option. The one side mounted terminal cup carries that load to the amplifier. Target 500 to 600 watts RMS and confirm your amplifier is stable at the load you wire.

Where is the terminal cup located on a down fire enclosure?

Side mounted. Every Proline X Performance Optimized enclosure uses a side mounted terminal cup, and on a down fire cabinet that keeps the connection accessible with the enclosure in its installed position, since the baffle faces the floor. The cup is our Proline X ABS and carbon fiber composite unit, recessed, with stainless hardware, copper ring terminals and pre-wired 12 gauge OFC.

How is this enclosure built?

V-groove and dado joinery, CNC cut on ShopSabre routers from Langboard Elite MDF, so every panel joint locks mechanically before adhesive is applied. The front baffle is a 1.5 inch double layer with the outer layer machined as a flush recess, and the driver lands on 8/32 threaded inserts with stainless machine screws. A windowed U-brace ties the long 41 inch panels together. Corners are square, the Down Fire series standard, which keeps the most internal volume for the footprint. Assembled and inspected in Tullahoma, Tennessee.

Do I need to add polyfill or damping?

No. Polyfill is already installed as a light wall lining, and the quantity is chosen so it does not change the acoustic volume. Do not add more: packing a sealed box makes it behave as though it were larger, which walks the alignment away from the 0.539 cubic feet this cabinet was built to.

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

No. This listing is for the enclosure only. Bring your own RS-W10D2 or RS-W10D4; the driver is purchased separately. The cutout and mounting depth are direct fit, and the 1.75 inch feet ship uninstalled for an installed height of 6.5 inches.

Same series, same size

Other Performance Optimized models