Alpine RSW10D4 Shallow Subwoofer in Proline X Micro Series Enclosure
Alpine RSW10D4 Shallow Subwoofer in Proline X Micro Series EnclosureAlpine RSW10D4 Shallow Subwoofer in Proline X Micro Series EnclosureAlpine RSW10D4 Shallow Subwoofer in Proline X Micro Series EnclosureAlpine RSW10D4 Shallow Subwoofer in Proline X Micro Series Enclosure

Loaded Series · Datasheet

Single 10" Sealed Micro Series System Loaded with Alpine RSW10 · Single 10" Sealed enclosure

Net volume
0.50 ft³
Tuning
N/A: Sealed
External dimensions
21.5" W × 14.5" H × 5.25" D
Buy at Audio IntensityFactory-direct, ships from Tullahoma
  • Best For: High-output stealth installs / Space-limited SQ builds
  • Configuration: Single 10" Sealed: Micro Series
  • Volume: 0.50 ft³ Net
  • Tuning: N/A, Sealed
  • Sonic Character: Deep, Accurate, High-Output

Spec of record

Technical specifications

Enclosure TypeSealed: Micro Series
ConfigurationSingle 10"
Net Volume0.50 ft³
Tuning FrequencyN/A: Sealed
External Dimensions21.5" W × 14.5" H × 5.25" D
MDFLangboard Elite 3/4"
JoineryV-groove + dado
Terminal CupRecessed ABS/Carbon Fiber Composite
Speaker Wire12g OFC pre-installed
Acoustic TreatmentPolyfill pre-installed
FinishPlush Black
Vehicle FitmentUniversal

Modelled response

Performance in this enclosure

Net airspace
0.50
cu ft per chamber
System Qtc
1.49–1.94
sealed
Half power
32.9–34.1
Hz · F3
Xmax at
998
W RMS · no filter
With 25 Hz subsonic
1005
W RMS · +1%
Amplifier
500–600
W RMS recommended
This enclosure holds 0.50 cu ft net per chamber. In it the Alpine RS-W10D2 runs a system Qtc of 1.49–1.94 with half power at 32.9–34.1 Hz, and the cone reaches its 20.0 mm travel limit at 998 W, above the driver’s 600 W thermal rating, so heat stops you before travel does. Run a subsonic filter at 25 Hz and that becomes 1005 W — +7 W, or 1 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 = 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

0.50 cu ft against a 20.6 L Vas.

α = Vas ÷ Vb = 1.46  ·  Fc = Fs√(α+1) = 47–50 Hz  ·  Qtc = 1.49–1.94
20 30 50 70 100 150 200 +6 +0 -6 -12 -18 -24 FREQUENCY · Hz LEVEL · dB −3 dB
D2 · Qtc 1.49, Fc 47 Hz, F3 32.9 HzD4 · Qtc 1.94, Fc 50 Hz, F3 34.1 Hz
The box lifts resonance from 30.0 Hz free-air to 47–50 Hz and half power lands at 32.9–34.1 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.

PXmax = 998–1011 W unfiltered  →  1005–1028 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 998 W reaches Xmax here
D2 · 1011 W, no filterD4 · 998 W, no filterD2 · 1028 W with subsonic at 25 Hz, 24 dB/octD4 · 1005 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 998 W, reached first at 47 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: stopping the cone wasting travel below the passband lets it take 1005 W before hitting the same 20.0 mm. That is 1 percent more amplifier for the price of one filter setting.
ParamValueUnitNote
Fs30.00Hzfree-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

The RSW10D4 is a step up in output from the TW3-D4 in the same enclosure footprint. The 4" neodymium voice coil at 3.25" depth is Alpine's answer to JL Audio's concentric tube, different engineering path to a similar goal, with a higher power ceiling as a result. In the 0.50 ft³ Micro Series box with polyfill, the RSW10D4 runs deeper and louder than most people expect from a system this size.

The impedance wiring is the same as the TW3-D4 version, Dual 4-ohm wired parallel to 2 ohms, pre-done at the terminal cup. Verify your amplifier is rated for 2-ohm operation. The RSW10D4 needs 450–600W RMS to perform at its capability. An underpowered amp on a 600W driver is a common install mistake. Budget for the amplifier accordingly.

At 21.5" × 14.5" × 5.25" the fitment story is identical to the TW3-D4 Micro Series system. Same footprint, same install locations. The decision between the two comes down to power budget and output requirements.

Before you order

Questions

What amplifier power is ideal?

I recommend an amplifier rated between 450 W and 650 W RMS. You can wire the dual 4 Ω coils in series (8 Ω) or parallel (2 Ω) to match your amp’s stable impedance. Running the amp at roughly 75% of its max power yields clean output with headroom for dynamic peaks. Always set gain controls by ear and use a test tone to avoid clipping.

Will it fit under my seat?

Measure your vehicle’s under-seat area for at least 6 in of clearance in height and 21 in in width. The enclosure is 5.25 in deep and the woofer mounts at 3.25 in, leaving room for wiring and carpet clearance. Many trucks and SUVs offer sufficient space. Always test-fit before final installation to confirm clearance.

Can I use this sub in a ported box?

Alpine recommends the RSW10D4 in a sealed enclosure for optimal performance. Porting this driver requires precise tuning of port dimensions and box volume. A poorly tuned port can raise resonance and introduce unwanted boominess. If you need a ported solution, consider a custom enclosure designed for that format.

What wiring options do I have?

You can wire the dual 4 Ω coils in series for an 8 Ω load, or in parallel for a 2 Ω load. Series wiring suits amps that perform best into high impedance. Parallel wiring delivers more current for greater output, provided your amp handles 2 Ω safely. Always consult your amplifier manual and verify stable operation at your chosen impedance.

What vehicle types suit this enclosure?

This compact system fits most cars, trucks, and SUVs under the front or rear seat. Its low profile makes it ideal for cab-over-engine trucks, mid-sized sedans, and crossover SUVs. It also works well in small off-road vehicles where space is limited. You can install it without drilling or permanent modifications.

Can I mount the enclosure vertically?

Yes. The sealed design allows flexible orientation. You can stand it upright behind a seat back or lay it flat under the seat. Just ensure the terminal cup remains accessible and that wiring has proper strain relief. Avoid mounting it where road debris or moisture might collect.

What is the lead time and how does shipping work?

This system is assembled to order in Tullahoma, Tennessee. Allow 2–5 business days for assembly before it ships. Shipping to the lower 48 states is included. No freight charges added at checkout. You'll receive a tracking number when the order ships.

What impedance does this system present to my amplifier?

The RSW10D4 is a Dual 4-ohm subwoofer. It ships pre-wired in parallel to a 2-ohm load at the terminal cup. Most Class D monoblocks are rated at 2 ohms. Connect your amplifier's speaker wire to the terminal cup and you're done. No rewiring required.

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