Ground Zero GZHW 8SPL-D2 FLAT 8″ Shallow Subwoofer 500w RMS
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The Ground Zero GZHW 8SPL-D2 FLAT is an 8 inch (20 cm) shallow-mount SPL subwoofer with dual 2 ohm voice coils, rated at 500W RMS (800W SPL) with a mounting depth of only 80 mm. It suits installs where space is very tight.
Ground Zero also makes this flat SPL design as the GZHW 10SPL-D2 FLAT 10 inch and the GZHW 12SPL-D2 FLAT 12 inch.
Key specifications
- Size: 20 cm / 8″ flat (shallow) SPL subwoofer
- Power handling: 500W RMS, 800W SPL
- Impedance: 2 x 2 ohms (dual voice coil)
- Efficiency: 83 dB
- Recommended amplifier power: 350 - 800 Watts
- Voice coil: 63 mm / 2.5″ copper, 4-layer
- Xmax: 24 mm
- Mounting diameter: 187 mm
- Mounting depth: 80 mm
GZHW 8SPL-D2 FLAT: 20 cm / 8″ high quality flat SPL subwoofer
A shallow-mount 8″ subwoofer built for tight spaces, delivering 500W RMS without compromising on output.
Features
- 8″ high quality flat SPL subwoofer
- Klippel® optimised for accurate, controlled excursion
- Sandwich paper cone for stiffness and low weight
- Durable U-shape rubber surround for long-term reliability
- Solid aluminium cast basket for a rigid, stable foundation
- 63 mm / 2.5″ copper voice coil
- 4-layer copper voice coil for efficient heat dissipation
- Push terminal for straightforward wiring
Explore the full range in Ground Zero.
Specification
| Model | High-Quality Flat SPL Subwoofer |
|---|---|
| Diameter | 20 cm / 8″ |
| Power handling | (RMS/SPL) 500 / 800 Watts |
| Impedance | 2x 2 Ohms |
| Efficiency | 83 dB |
| Power recommendation | 350 – 800 Watts |
| Voice coil | 63 mm / 2.5″ Copper |
| Cone | Sandwich paper |
| Max. Excursion (Xmax) | 24 mm / 0.94″ |
| Mounting Ø | 187 mm / 7.36″ |
| Mounting depth | 80 mm / 3.15″ |
| Resonance frequency (Fs) | 31.5 Hz |
| Overall quality (Qts) | 0.41 |
| Equiv. air volume (Vas) | 14.2 L / 0.50 ft³ |
What's Included
- GZHW 8SPL-D2 FLAT
Ground Zero
About the Ground Zero GZHW 8SPL-D2 FLAT
From our tech experts at CEN
A Ground Zero 8 inch subwoofer, handling 500w 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 shallow is the GZHW 8SPL-D2 FLAT?
A: The 8SPL-D2 FLAT has a mounting depth of 80 mm (3.15″), so it fits shallow enclosures and tight spaces where standard subwoofers won't.
Q: What impedance is the GZHW 8SPL-D2 FLAT?
A: It has dual 2 ohm voice coils (2 x 2 ohms), so it can be wired to 1 ohm or 4 ohm depending on your amplifier.
Q: How much amplifier power does the GZHW 8SPL-D2 FLAT need?
A: Ground Zero recommends 350 - 800 Watts of amplifier power.
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.
