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The Ground Zero GZTT 20S is a 20 mm coated silk dome car tweeter with a neodymium motor and ferrofluid cooling, rated at 40W RMS (70W max) with a 3500 Hz high pass filter. It is supplied as a pair with variable mounting parts for flexible installation.
Key specifications
- Dome: 20 mm coated silk
- Impedance: 4 ohm
- Power handling: 40W RMS, 70W max (HPF at 3500 Hz, 12 dB/oct)
- Frequency response: 3 – 20 kHz
- Recommended high pass: 3500 Hz, 12 dB/oct
- Outer diameter: 54 mm / 2.13″
- Mounting cut-out: 46 mm / 1.81″
- Mounting depth: 18 mm / 0.70″
20 mm / 0.79″ silk dome tweeter
A compact, high-quality silk dome tweeter with ferrofluid cooling and a neodymium motor, supplied as a pair with all mounting accessories included.
Features
- 20 mm / 0.79″ silk dome tweeter
- Coated silk dome for smooth, detailed high-frequency sound
- Variable mounting parts included for flexible installation
- Ferrofluid cooled for improved power handling and reliability
- Neodymium motor for a lightweight yet efficient design
- Supplied as a pair
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Specification
| Impedance | 4 Ohm / ohms |
|---|---|
| Frequency Response | 3 – 20 kHz |
| Efficiency (SPL) | 89 dB |
| Resonance Frequency | 1700 Hz |
| Power Handling | (RMS) 40 Watt / Watts (HPF @ 3500 Hz / 12dB/oct) |
| Power Handling | (max) 70 Watt / Watts (HPF @ 3500 Hz / 12dB/oct) |
| Cut-off Frequency (HPF) | 3500 Hz / 12 dB (recommended) |
| Outer Diameter | 54 mm / 2.13” |
| Mounting Cutout | 46 mm / 1.81” |
| Mounting Depth | 18 mm / 0.70” |
What's Included
- GZTT 20S
Ground Zero
About the Ground Zero GZTT 20S
From our tech experts at CEN
Ground Zero tweeters, 0.75 inch, handling 40w RMS, with a silk dome for a smoother top end than metal designs.
Who it suits
Drivers building or repairing a front stage where the tweeter needs to sit higher than the door.
Our tech experts advise
Placement and aiming change the result more than the tweeter does, and they must be crossed over properly. get in touch. 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: Is the GZTT 20S sold as a pair?
A: Yes. The GZTT 20S is supplied as a pair, with variable mounting parts for flexible installation.
Q: Does the GZTT 20S need a crossover?
A: Yes. Ground Zero recommends a high pass filter at 3500 Hz with a 12 dB/oct slope, and the power ratings of 40W RMS and 70W max are quoted with that filter in place.
Q: What size hole does the GZTT 20S need?
A: It needs a 46 mm mounting cut-out and 18 mm of mounting depth. The outer diameter is 54 mm.
Q: Can CEN fit these tweeters for me?
A: Yes. CEN offers professional installation from our Nottingham premises. Contact us to book an installation slot or ask for a fitting quote.
