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The Ground Zero Iridium GZIW 300 is a 12 inch (30 cm) 4 ohm car subwoofer rated at 350W RMS. Klippel optimised for low distortion across its full range of movement, it delivers accurate, controlled bass.
Other sizes in the Iridium subwoofer range: GZIW 165 6.5 inch, GZIW 200 8 inch, GZIW 250 10 inch.
Key specifications
- Size: 12″ / 30 cm
- Power handling: 350W RMS
- Recommended amplifier power: 200 – 400W
- Impedance: 4 ohm
- Sensitivity: 88 dB
- Voice coil: 50 mm / 2″ copper
- Xmax: 28 mm / 1.10″
- Mounting diameter: 287 mm / 11.30″
- Mounting depth: 149 mm / 5.87″
30 cm / 12″ high quality subwoofer
A 350w RMS, 4 Ohm subwoofer built for accurate, controlled bass. Klippel® optimised for low distortion across its full range of movement.
Features
- 12″ subwoofer
- Klippel® optimized
- 3D HQPP cone
- Long stroke rubber surround
- Resonance free steel basket
- 50 mm / 2″ copper voice coil
- Polycot spider
- IMPP dust cap with 3D structure logo
Explore the full range in Ground Zero.
Specification
| Diameter | 30 cm / 12″ |
|---|---|
| Power Handling | (RMS) 350 Watts |
| Impedance | 4 Ohms |
| Efficiency | 88 dB |
| Power recommendation | 200 – 400 Watts |
| Voice coil | 50 mm / 2″ copper |
| Cone | HQPP cone with 3D structure |
| Max. Excursion (Xmax) | 28 mm / 1.10″ |
| Mounting Ø | 287 mm / 11.30″ |
| Mounting depth | 149 mm / 5.87″ |
| Resonance frequency (Fs) | 30 Hz |
| Overall quality (Qts) | 0.58 |
| Equiv. air volume (Vas) | 69.3 L / 2.45 cu.ft. |
What's Included
- GZIW 300
Ground Zero
About the Ground Zero GZIW 300
From our tech experts at CEN
A Ground Zero 12 inch subwoofer, 4 ohm, handling 350w RMS.
Who it suits
Drivers building a system where the bass keeps pace with the front stage, and competition builds where output is the point.
Our tech experts advise
Enclosure volume and tuning decide most of what you hear. We build enclosures to suit both driver and vehicle at our Beeston workshop. Installation is priced per vehicle, so get in touch with your make, model and year and we will confirm what it needs. See car audio installation.
Explore the full Ground Zero range at CEN, with fast UK dispatch and expert advice from our Nottingham team. Shop all Ground Zero
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Frequently Asked Questions
Q: How do I choose the right amplifier for my speakers or subwoofer?
A: Match the amplifier's RMS output per channel to the RMS handling of your speakers or subwoofer at the same impedance. The Specification tab lists the power figures. If in doubt, contact CEN with your setup and we will recommend a match.
Q: How much amplifier power does the GZIW 300 need?
A: It is rated at 350W RMS, and Ground Zero recommends an amplifier delivering 200 to 400 watts into 4 ohms.
Q: How deep is the GZIW 300?
A: It needs 149 mm of mounting depth and a 287 mm mounting diameter.
Q: Can CEN fit this subwoofer for me?
A: Yes. CEN offers professional subwoofer and amplifier installation from our Nottingham premises. Contact us to book an installation slot or ask for a fitting quote.
