Option Audio ROCK-4 Subwoofer for Cupra Born & VW ID.3
Couldn't Load Pickup availability
The Option Audio ROCK-4 is a passive 8 inch (20cm) 120W RMS subwoofer in a sealed, felt-covered enclosure designed to fit out of sight in the boot of the Cupra Born and VW ID.3.
The boot stays fully usable, and it connects through a plug and play socket. As a passive subwoofer it needs an amplifier.
Key specifications
- Subwoofer: 8 inch (20cm), passive
- Power: 120W RMS
- Impedance: 2 Ohm
- Enclosure: Rigid wood, sealed, black felt OEM look
- Connection: Plug and play socket
- Fits: Cupra Born and VW ID.3 boot
Cupra Born & VW ID.3 subwoofer
The ROCK-4 is designed for invisible installation in the Cupra Born and VW ID.3 boot. Its sealed enclosure delivers defined kick bass from the 20cm driver. The boot remains fully usable.
Features
- Rigid wooden housing covered in black felt for an OEM look
- 8 inch (20cm) subwoofer, 120W RMS
- Plug & Play connection socket
- 2 Ohm impedance
Explore the full range in Option Audio Plug & Play.
Specification
| Size | 8 Inch |
|---|---|
| RMS Power | 120w |
| Shape | Square |
| Voice Coil | Single |
| Type | Passive Enclosure |
| Series | Plug & Play |
| Article Number | SUB-104 |
| Country of Manufacture | China |
More specs
| |
What's Included
- 1x OPTION Audio ROCK-4
Option Audio
About the Option Audio SUB-104
From our tech experts at CEN
The Option Audio ROCK-4 is a passive 8 inch subwoofer in a rigid, sealed enclosure covered in black felt, built specifically to fit out of sight in the boot of the Cupra Born and VW ID.3. It handles 120W RMS at 2 Ohm impedance and connects via a plug and play socket, leaving the boot fully usable.
Who it suits
This suits Cupra Born and VW ID.3 owners who want a clean, OEM-look bass upgrade without sacrificing boot space. As a passive subwoofer it requires a separate amplifier, so it works best alongside a capable aftermarket head unit or dedicated amp.
Our tech experts advise
Because the ROCK-4 presents a 2 Ohm load, confirm your amplifier is stable at 2 Ohm before purchasing. The plug and play socket simplifies wiring, but routing cables to an amplifier still involves accessing door and boot trim. Fitting is priced per vehicle, so speak to our Nottingham installation team for a quote.
Explore the full Option Audio range at CEN, with fast UK dispatch and expert advice from our Nottingham team. Shop all Option Audio
Recommended For You
Discover more top-rated gear, handpicked to go with what you're viewing
Have it Fitted By Our Team
Our team fits car audio, stereos, dash cams and vehicle security at our workshop in Beeston, Nottingham. Tell us your vehicle and we'll confirm the parts and a fitted price.
- 1
Tell us your vehicle
Make, model and year, and what you'd like fitted.
- 2
We confirm the parts
Fascia, wiring and interfaces checked for your car, with a fitted price.
- 3
Fitted at our workshop
Bring it to our Beeston workshop and we do the rest.
Unit 25 Technology Drive, Beeston, Nottingham NG9 1LA
More from Option Audio
More options from the same range, in stock and ready to go
Option Audio VW T6.1 Plug & Play Kit 6-Channel DSP Amp & Sub
£919.00
View product
Option Audio V-165X Plug & Play Coaxial Speakers for Volkswagen Skoda Seat
£199.00
Option Audio Plug & Play Subwoofer Upgrade for VW Golf Mk8
£329.00
Option Audio V-165 Plug & Play Component Speakers for Volkswagen Skoda Seat
£219.00
Option Audio BM-100 Plug & Play Component Speakers for BMW E F and G Series
£219.00
Frequently Asked Questions
Q: Do I need an amplifier for this subwoofer?
A: Yes, unless it is an active (powered) subwoofer with a built-in amplifier. Passive subwoofers need an external amplifier matched to the RMS power and impedance shown in the Specification tab.
Q: What does RMS power mean?
A: RMS is the continuous power a subwoofer can handle, and it is the number that matters when matching an amplifier. Peak or max figures describe short bursts only. Match your amplifier output to the RMS rating in the Specification tab.
Q: Can CEN build or supply an enclosure and fit everything?
A: Yes. CEN supplies enclosures and offers professional installation from our Nottingham premises, including amplifier wiring. Contact us to discuss your build.
Q: Does the ROCK-4 take up boot space?
A: It is designed for invisible installation in the boot of the Cupra Born and VW ID.3, and the boot remains fully usable.
Q: What impedance is the ROCK-4?
A: The ROCK-4 is a 2 Ohm subwoofer rated at 120W RMS.
Q: Is the ROCK-4 active or passive?
A: It is passive, so it needs to be powered by an amplifier.
Not Sure Where to Start?
Straightforward advice and the latest news from our Nottingham team.
All Guides and News →
Car Audio
Christmas Gift Guide 2026: Car Audio, Dash Cams and Outdoor Tech
Read the guide →
Car Audio
Upgrading Car Audio Without Replacing the Factory Stereo
Read the guide →
Car Audio
Amplifier Wiring Kits Explained: Gauge, Fuses and Earths
Read the guide →
Car Audio
New at CEN: Option Audio Drive-10Flat — Golf Mk8 Bass, Zero Boot Space Lost
Read more →
Car Audio
Car Speaker Sizes Explained: What Fits Your Car
Read the guide →
Car Audio
Alpine iLX-F905D Halo9 Review: The Big-Screen Upgrade for Almost Any Car
Read more →