How much power does the W12T4S4 need?

It is rated 350 watts RMS, CEA-2031 compliant, with a 1400-watt peak figure. A small mono amp in the 300-watt range is enough. Do not feed it big power, since the single voice coil and basic motor are not built for it.

What box size does it work in?

Rockville lists 0.67 to 1.7 cubic feet sealed and 1.0 to 2.0 cubic feet vented. A shallow sealed box is the simplest fit for tight spaces.

Will it fit behind a truck seat?

It needs 3.7 inches of mounting depth and a 10.98-inch cutout. That makes it one of the few 12-inch subs that fits shallow behind-seat boxes.

Is it 2-ohm or 4-ohm?

It is a single 4-ohm voice coil (SVC 4 ohm). Wire it to a mono amp that makes its rated power at 4 ohms.

How does it compare with a Kicker shallow sub?

It costs less and handles less power. Kicker and JL Audio shallow subs are louder and better built, but they need more amplifier power and a bigger budget.

The subwoofer and an owner's manual. It does not include an enclosure, wiring or grille.

What do buyers say about the Rockville W12T4S4 12" Shallow Mount Car Subwoofers?

Rated 3 out of 5 from 5 ratings.

Where can I buy the Rockville W12T4S4 12" Shallow Mount Car Subwoofers?

6 stores we checked sell it, including Walmart, Amazon, Rockville Audio, eBay, Audiosavings.

Rockville W12T4S4 12" Shallow Mount Car Subwoofers

Best price now

$114.90at WalmartChecked 11 h ago

Compared across 7 stores. Prices are checked against each store and labelled with when.

Visit Walmart

Rockville W12T4S4 12" Shallow Mount Car Subwoofers

Best price now

$114.90at WalmartChecked 11 h ago

Compared across 7 stores. Prices are checked against each store and labelled with when.

Visit Walmart

Ask our agent about this product

It checks today's price at every store, compares the alternatives and answers in about a minute.

Price facts

Lowest price today: $114.90 at Walmart (checked Nov 13, 2026).
Checked at 7 stores.

Our take on the Rockville W12T4S4 12" Shallow Mount Car Subwoofers

The Rockville W12T4S4 is a 12-inch shallow-mount car subwoofer built for tight spaces. It needs only 3.7 inches of mounting depth, so it fits behind seats and in shallow boxes where a standard sub will not. Power handling is modest: 350 watts RMS, CEA-2031 compliant, with a 4-ohm single voice coil. It suits budget builds and truck or crew-cab installs that need bass without giving up cargo room. Against shallow rivals from Kicker and JL Audio, it gives up output and build refinement but asks far less of the wallet and the amplifier.

Best forTruck and crew-cab owners with little behind-seat spaceShallow sealed or vented box buildsBudget systems running a modest ampBuyers who need a 12-inch sub in a thin enclosure

Pros

3.7-inch mounting depth fits shallow locations
350 watts RMS is easy on small amplifiers
Single 4-ohm voice coil keeps wiring simple
Works sealed or vented, with published box sizes
Spring-loaded push terminals and rubber magnet boot

Cons

Modest output for a 12-inch sub
Single voice coil limits wiring flexibility
Paper composite cone and butyl surround are basic materials
Not a match for high-power amplifiers

Rockville W12T4S4 12" Shallow Mount Car Subwoofers prices at every store

WalmartNew
In stockSold by Audiosavings
$114.90Free shippingChecked 11 h ago
Visit Walmart
WalmartNew
In stockSold by AudiosavingsReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
$114.90Free shippingChecked 11 h ago
Visit Walmart
Rockville AudioNew
In stock
$114.90Free shippingChecked 11 h ago
Visit Rockville Audio
eBayNew
In stockSold by audiosavings
$114.90Free shippingChecked 11 h ago
Visit eBay
AmazonNew
Availability unknown
As an Amazon Associate, Deal.ai earns from qualifying purchases.
$114.90Free shippingChecked 11 h ago
Visit Amazon
AudiosavingsNew
Availability unknown
$114.90Checked 11 h ago
Visit Audiosavings
Newegg.comNew
Availability unknownSold by Muxiju Store
$172.49Checked 11 h ago
Visit Newegg.com

Store links may earn us a commission.

Rockville W12T4S4 12" Shallow Mount Car Subwoofers price history

Lowest price we've seen: $114.90 on Nov 13 at Rockville Audio. Tracked across 6 stores since Nov 13.

About the Rockville W12T4S4 12" Shallow Mount Car Subwoofers

The Rockville W12T4S4 is a 12-inch shallow mount car subwoofer with a single 4-ohm voice coil. It is rated for 1400 watts peak power and 350 watts RMS (CEA-2031 compliant). Its compact, lightweight design suits installations with limited mounting depth.

The cone is made of ultra-stiff paper composite with a 3D molded high gloss acrylic dust cap and a high density laminated butyl rubber surround. The basket is ultra-slim expanded and rolled steel. The motor uses a high power strontium magnet with an ultra saturated, high BL motor gap and a vented core magnet structure. A rubber boot covers the magnet.

The 2-inch voice coil is wound on a high temperature aluminum former. Connections are made through dual chrome plated spring loaded push terminals.

Size: 12 inches
Peak Power: 1400 watts
RMS Power: 350 watts (CEA-2031 compliant)
Impedance: 4 ohms, single voice coil
Voice Coil: 2 inches, high temperature aluminum former
Cone: Ultra-stiff paper composite
Dust Cap: 3D molded high gloss acrylic
Surround: High density laminated butyl rubber
Basket: Ultra-slim expanded and rolled steel
Magnet: High power strontium magnet with rubber boot
Terminals: Dual chrome plated spring loaded push terminals
Cutout Diameter: 10.98 inches
Mounting Depth: 3.7 inches
Frequency Response: 34 Hz to 500 Hz
Sensitivity: 89 dB at 1 W/1 m
Sealed Enclosure: 0.67 to 1.7 cu. ft.
Vented Enclosure: 1.00 to 2.0 cu. ft.
Documentation: Owner's manual

Specifications

size: 12\"Source

Questions and answers

How much power does the W12T4S4 need?: It is rated 350 watts RMS, CEA-2031 compliant, with a 1400-watt peak figure. A small mono amp in the 300-watt range is enough. Do not feed it big power, since the single voice coil and basic motor are not built for it.
What box size does it work in?: Rockville lists 0.67 to 1.7 cubic feet sealed and 1.0 to 2.0 cubic feet vented. A shallow sealed box is the simplest fit for tight spaces.
Will it fit behind a truck seat?: It needs 3.7 inches of mounting depth and a 10.98-inch cutout. That makes it one of the few 12-inch subs that fits shallow behind-seat boxes.
Is it 2-ohm or 4-ohm?: It is a single 4-ohm voice coil (SVC 4 ohm). Wire it to a mono amp that makes its rated power at 4 ohms.
How does it compare with a Kicker shallow sub?: It costs less and handles less power. Kicker and JL Audio shallow subs are louder and better built, but they need more amplifier power and a bigger budget.
What is in the box?: The subwoofer and an owner's manual. It does not include an enclosure, wiring or grille.
Where is the Rockville W12T4S4 12" Shallow Mount Car Subwoofers cheapest?: At Walmart, for $114.90, as of our latest check.
What do buyers say about the Rockville W12T4S4 12" Shallow Mount Car Subwoofers?: Rated 3 out of 5 from 5 ratings.
Where can I buy the Rockville W12T4S4 12" Shallow Mount Car Subwoofers?: 6 stores we checked sell it, including Walmart, Amazon, Rockville Audio, eBay, Audiosavings.