Does this include the subwoofer and the box?

Yes. It is a package with the Alpine W12S4 12-inch sub already mounted in the vented enclosure.

What amp power does it need?

The sub is rated 250 watts RMS and 750 watts peak at 4 ohms. A mono amp rated around 250-300 watts RMS at 4 ohms is a good match.

Is the box sealed or vented?

It is vented (ported), with about 1.6 cubic feet of air space. Alpine lists 1.91 cubic feet as the optimum ported volume.

Will it fit my trunk?

The box measures 18 inches wide, 13 inches high and 16 inches deep. Check those against your trunk opening and cargo space before buying.

A grille is not included. Alpine lists the KTE-12PG as the optional grille if you want cone protection.

Can I wire it to a 2-ohm amp?

No. It is a single 4-ohm voice coil, so it presents a 4-ohm load and cannot be wired down to 2 ohms.

Alpine Universal Vented Single 12" W12S4 Loaded Subwoofer Sub Box Enclosure

Best price now

$144.95at WalmartChecked Nov 9

Prices are checked against each store and labelled with when.

Visit Walmart

Alpine Universal Vented Single 12" W12S4 Loaded Subwoofer Sub Box Enclosure

Best price now

$144.95at WalmartChecked Nov 9

Prices are checked against each store and labelled with when.

Visit Walmart

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Price facts

Last seen at $144.95 at Walmart on Nov 9.

Our take on the Alpine Universal Vented Single 12" W12S4 Loaded Subwoofer Sub Box Enclosure

This is a prebuilt package: an Alpine BassLine W12S4 12-inch single 4-ohm subwoofer already mounted in a vented MDF enclosure. The sub handles 250 watts RMS (750 peak), plays 22-200 Hz, and uses a mica-injected polypropylene cone with a foam surround. The box gives it about 1.6 cubic feet of air space, close to Alpine's 1.91 cubic foot ported recommendation, so it is tuned for strong output rather than deep extension. It suits someone who wants bass without building or cutting a box, and it is simpler than buying a sub and enclosure separately.

Best forFirst-time bass upgradesShoppers who don't want to build a boxSingle-sub setups in sedans and hatchbacksTight trunk or cargo spaces

Pros

Sub and vented box come matched and assembled
250 watts RMS is easy to power with a modest amp
Single 4-ohm voice coil works with common mono amps
MDF box with a sprayed, water-resistant finish
Binding terminal cup takes banana plugs or bare wire

Cons

Box air space (1.6 cu ft) is below Alpine's 1.91 cu ft ported spec
Single 4-ohm coil limits wiring options for high-output amps
Grille is not included and sold separately
Foam surround ages faster than rubber in hot climates
Vented box is large for a single 12 and needs room

Alpine Universal Vented Single 12" W12S4 Loaded Subwoofer Sub Box Enclosure prices at every store

WalmartNew
In stockSold by HiFiSoundConnectionReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
$144.95Free shippingChecked Nov 9
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What reviewers say

Owners of the BassLine W12S4 describe solid, punchy output for the power and easy installation. The main complaints are that the vented box is bulky and that the sub wants more air space than the enclosure provides.

What people mention

OutputPraisedOwners say it delivers strong, punchy bass for its power rating.
Box sizeCriticisedBuyers note the vented enclosure takes up a lot of trunk space.
Enclosure tuningMixedSome find the bass boomy because the box is smaller than Alpine's ported spec.
InstallPraisedThe pre-mounted sub and terminal cup make wiring simple.
DurabilityMixedThe sprayed box finish is liked, but the foam surround worries long-term owners.

About the Alpine Universal Vented Single 12" W12S4 Loaded Subwoofer Sub Box Enclosure

This package is an Alpine W12S4 BassLine Series 12" subwoofer loaded into a vented single-12" enclosure. The subwoofer has a single 2" voice coil with a 4 ohm impedance. Its cone is made of mica injected polypropylene (MIPP) with a poly-foam surround.

The enclosure is made of MDF and has a vented design for maximum output. It is finished with seven sprayed-on layers, the same technology as spray-on bed liner, for a durable, water-resistant finish. The binding terminal cup accepts banana plugs or bare wire up to 10 GA.

A grille is optional. The Alpine KTE-12PG is an accessory sold separately.

In the box: 1 x vented single 12" sub box enclosure, 1 x Alpine W12S4 12" subwoofer
Series: Alpine BassLine
Subwoofer size: 12"
Power handling: 50-250 watts RMS
Voice coil: Single, 2" diameter
Impedance: 4 ohms per voice coil
Frequency response: 22-200 Hz
Sensitivity: 87.9 dB
Xmax: 10 mm
Cone: Black, mica injected polypropylene (MIPP)
Surround: Poly-foam
Design: Round
Enclosure type: Vented, single 12"
Enclosure material: MDF with seven sprayed-on layers

Specifications

color: BlackSource
size: 12"Source
power handling: 50-250 watts RMS
top-mount depth: 5-5/16"

Questions and answers

Does this include the subwoofer and the box?: Yes. It is a package with the Alpine W12S4 12-inch sub already mounted in the vented enclosure.
What amp power does it need?: The sub is rated 250 watts RMS and 750 watts peak at 4 ohms. A mono amp rated around 250-300 watts RMS at 4 ohms is a good match.
Is the box sealed or vented?: It is vented (ported), with about 1.6 cubic feet of air space. Alpine lists 1.91 cubic feet as the optimum ported volume.
Will it fit my trunk?: The box measures 18 inches wide, 13 inches high and 16 inches deep. Check those against your trunk opening and cargo space before buying.
Do I need a grille?: A grille is not included. Alpine lists the KTE-12PG as the optional grille if you want cone protection.
Can I wire it to a 2-ohm amp?: No. It is a single 4-ohm voice coil, so it presents a 4-ohm load and cannot be wired down to 2 ohms.
Where is the Alpine Universal Vented Single 12" W12S4 Loaded Subwoofer Sub Box Enclosure cheapest?: At Walmart, for $144.95, as of our latest check.