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The Ground Zero GZHW 25XSPL-D1 is a competition-grade 10″ (25 cm) SPL subwoofer with dual 1 ohm voice coils, rated at 1200W RMS and 2500W SPL. It is part of Ground Zero's GZHW XSPL range, built for high-power SPL builds.
This listing is the dual 1 ohm version. The GZHW 25XSPL is also available as the GZHW 25XSPL-D2 in dual 2 ohm, and as the GZHW 30XSPL-D1 in 12″.
Key specifications
- Size: 25 cm / 10″
- Power handling: 1200W RMS, 2500W SPL
- Impedance: 2 x 1 ohms (dual voice coil)
- Efficiency: 83 dB
- Recommended amplifier power: 800–2500W
- Voice coil: 63 mm / 2.5″ copper
- Xmax: 45 mm
- Mounting diameter: 238 mm
GZHW 25XSPL-D1: 25 cm / 10″ SPL subwoofer
A competition-grade 10″ subwoofer built for serious output. Dual 1 ohm voice coils and 1200W RMS power handling make it well suited to high-power SPL builds.
Features
- 10″ high quality SPL subwoofer
- Klippel® optimised
- Reinforced paper cone
- Long stroke compound surround
- Solid aluminium cast basket
- 63 mm / 2.5″ copper voice coil
- 2-layer Polycot spider
- IMPP dust cap with 3D structure logo
Explore the full range in Ground Zero Hydrogen.
Specification
| Model | High-Quality SPL subwoofer |
|---|---|
| Diameter | 25 cm / 10″ |
| Power handling | (RMS/SPL) 1200 / 2500 Watts |
| Impedance | 2x1 Ohms |
| Efficiency | 83 dB |
| Power recommendation | 800 – 2500 Watts |
| Voice coil | 63 mm / 2.5″ Copper |
| Cone | Reinforced paper |
| Max. Excursion (Xmax) | 45 mm / 1.77″ |
| Mounting Ø | 238 mm / 9.37″ |
| Resonance frequency (Fs) | 41.8 Hz |
| Overall quality (Qts) | 0.487 |
| Equiv. air volume (Vas) | 8.53 L / 0.30 cu.ft. |
What's Included
- GZHW 25XSPL-D1
Ground Zero
About the Ground Zero GZHW 25XSPL-D1
From our tech experts at CEN
A Ground Zero 10 inch subwoofer, 1 ohm, handling 1200w 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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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
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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: What impedance is the GZHW 25XSPL-D1?
A: It has dual 1 ohm voice coils (2 x 1 ohms). Wired in series it presents a 2 ohm load; in parallel, 0.5 ohm.
Q: How much amplifier power does the GZHW 25XSPL-D1 need?
A: It is rated at 1200W RMS (2500W SPL), and Ground Zero recommends 800 - 2500 Watts of amplifier power.
Q: What is the difference between the GZHW 25XSPL-D1 and 25XSPL-D2?
A: They share the same 10 inch SPL design and 1200W RMS rating. The D1 has dual 1 ohm voice coils and the D2 has dual 2 ohm voice coils, so choose the one that suits the load your amplifier is stable into.
Q: Can CEN fit this subwoofer for me?
A: Yes. CEN offers professional subwoofer installation from our Nottingham premises. Contact us to book an installation slot or ask for a fitting quote.
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