GZRW 25-D2 - Subwoofer Ground Zero - Free user manual and instructions
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| Product Type | Car Audio Subwoofer |
| Brand | Ground Zero |
| Model | GZRW 25-D2 |
| Size | 10 inches (25 cm) |
| Impedance | Dual 2-ohm (configurable to 1 or 4 ohms) |
| RMS Power Handling | 400 Watts |
| Peak Power Handling | 800 Watts |
| Sensitivity | 87 dB (1W/1m) |
| Frequency Response | 25 Hz – 500 Hz |
| Recommended Enclosure Volume | Sealed: 0.8 cu ft; Ported: 1.2 cu ft |
| Mounting Depth | 5.5 inches (140 mm) |
| Cutout Diameter | 9.25 inches (235 mm) |
| Overall Diameter | 10.6 inches (270 mm) |
| Weight | 12.5 lbs (5.7 kg) |
| Voice Coil | Dual 2-ohm, high-temperature |
| Cone Material | Paper with polyurethane coating |
| Surround Material | High-foam rubber |
| Basket Material | Cast aluminum |
| Magnet Type | Ferrite |
| Power Connection | Push terminals (accepts up to 8 AWG) |
| Safety Features | Over-excursion protection, short-circuit protection |
| Maintenance | Wipe with damp cloth; avoid solvents |
| Reparability | Recone kits available; serviceable by authorized technicians |
Frequently Asked Questions - GZRW 25-D2 Ground Zero
What is the impedance of the GZRW 25-D2 and how can it be wired?
The GZRW 25-D2 has dual 2-ohm voice coils. You can wire the coils in series for a 4-ohm load or in parallel for a 1-ohm load to match your amplifier.
What size enclosure does this subwoofer require?
A sealed enclosure of about 0.8 cubic feet or a ported enclosure tuned to 35 Hz with 1.2 cubic feet internal volume works well.
What is the RMS and peak power handling?
The RMS power handling is 400 watts and the peak power handling is 800 watts. Ensure your amplifier provides clean power within these limits.
Is the GZRW 25-D2 good for deep bass?
Yes, with a frequency response extending down to 25 Hz, it can reproduce low frequencies effectively in a properly designed ported enclosure.
What is the mounting depth and cutout size?
The mounting depth is 5.5 inches (140 mm) and the required cutout diameter is 9.25 inches (235 mm). Measure your enclosure to ensure proper fit.
How do I break in my new subwoofer?
Play music at low to moderate volume for about 20 hours. Avoid heavy bass during break-in to allow the suspension to loosen naturally.
Can I use this subwoofer in a bandpass enclosure?
While possible, it is not recommended. Ground Zero suggests sealed or ported enclosures for optimal performance and reliability.
What gauge of power wire should I use?
For the subwoofer connections, use 12 to 8 AWG wire. For the amplifier power wire, refer to the amplifier's manual (typically 4 AWG or larger).
How do I clean the subwoofer?
Wipe the cone and surround with a soft damp cloth. Do not use any solvents or cleaners as they may damage the materials.
Where can I find a replacement or recone kit?
Contact Ground Zero authorized dealers or service centers for recone kits. Always have repairs done by qualified technicians.
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