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The Helix PR T25-S is a pair of 1 inch (25 mm) coated silk dome tweeters from the Helix Pure R-Series, built around a neodymium magnet for precise, natural high-frequency reproduction.
These are the tweeters used in the HELIX PR K165.2 component set. The PR ATP25 aluminium tweeter pods are optionally available for surface mounting.
Key specifications
- Type: tweeter pair
- Dome: 1" / 25 mm coated silk dome
- Impedance: 4 ohms
- Frequency response: 2,500 Hz to 25,000 Hz
- Resonance frequency: 1,400 Hz
- Sensitivity: 92 dB @ 2.83 V / 1 m (89 dB @ 1 W / 1 m)
- Installation diameter: 37.7 mm
- Installation depth: 10.6 mm
Helix Pure R-Series
The Pure R-Series sits at the top of the Helix Pure speaker range, combining uncompromising sound quality with premium materials and a refined aesthetic. It's aimed at audiophiles who want the best from a car audio front stage without compromise.
Absolute high-frequency brilliance
The PR T25-S is built to the tightest manufacturing tolerances in the Pure lineup. The coated silk dome delivers smooth, detailed treble with natural reproduction, while the highly efficient neodymium magnet maintains consistent, linear magnetic flux. The compact anodized aluminium flush mount housing includes a solid mounting ring for a discreet, concealed fit. Two swappable grille designs are included for protection and a choice of finish.
Features
- 1" / 25 mm coated silk dome for precise treble and natural sound reproduction
- Compact design with multiple mounting options for universal installation
- Anodized aluminium flush mount housing with solid mounting ring for discreet installation
- Two swappable cover grille designs included
- Lowest manufacturing tolerances with exclusive premium materials throughout
- Highly efficient neodymium magnet for optimal linear magnetic flux
- High-grade aluminium tweeter pod (PR ATP25) optionally available
Explore the full range in Helix Pure Speakers.
Specification
| Impedance | Z 4 Ω |
|---|---|
| Frequency response | 2,500 Hz - 25,000 Hz |
| Sensitivity | SPL 92 dB @ 2,83V / 1m 89 dB @ 1W / 1m |
| Voice coil | diameter ø 25 mm |
| Cone | area Sd 4.9 cm² |
| Cone | material Coated silk dome |
More specs
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What's Included
- 2 x Tweeter PR T25-S
- 2 x Aluminum flush mount housing
- 2 x OEM spacer
- 2 x Standard grille
- 2 x Exclusive HELIX grille
- 1 x Mounting material
Helix
About the Helix PR21100
From our tech experts at CEN
The Helix PR T25-S is a pair of 1 inch (25 mm) coated silk dome tweeters from the Pure R-Series, with neodymium magnets. They cover 2.5 to 25 kHz at 4 ohms with 92 dB sensitivity, and need 10.6 mm of depth and a 37.7 mm installation diameter.
Who it suits
Drivers building a Pure R front stage, or replacing tweeters from the PR K165.2 set, where these are the supplied units. Aluminium flush housings, OEM spacers and two grille styles are in the box. For surface mounting on a pillar or dash, add the PR ATP25 pods.
Our tech experts advise
Use a high-pass from a DSP or crossover and never run them full range. The PR W165 woofer is the matching midbass. Aim them at the listening position. Get in touch if you want help with placement.
Explore the full Helix range at CEN, with fast UK dispatch and expert advice from our Nottingham team. Shop all Helix
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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.
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Tell us your vehicle
Make, model and year, and what you'd like fitted.
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We confirm the parts
Fascia, wiring and interfaces checked for your car, with a fitted price.
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Bring it to our Beeston workshop and we do the rest.
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Frequently Asked Questions
Q: Will these speakers fit my car?
A: Most car speakers are standard sizes, but mounting depth and fitting rings vary by vehicle. Check the size in the Specification tab against your vehicle, or contact CEN with your registration and we will confirm fitment and any adapters or fitting kits you need.
Q: Do I need an amplifier to run these speakers?
A: Not always. Most speakers will run from a standard head unit, but a dedicated amplifier lets them perform at their best, particularly for component sets and higher power handling models. The RMS figure in the Specification tab is the guide to how much clean power they can use.
Q: What is the difference between coaxial and component speakers?
A: Coaxial speakers combine the tweeter and woofer in one unit for a simple like-for-like upgrade. Component sets separate the tweeter and woofer with a crossover for better imaging and detail, and suit installs where sound quality is the priority.
Q: Do these come as a pair?
A: Unless stated otherwise, car speakers are sold in pairs. Check the product title and What's Included tab, which lists exactly what is in the box.
Q: Can CEN fit these speakers 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.
Q: Do the HELIX PR T25-S tweeters need a crossover?
A: Yes. Tweeters must be fed through a high-pass filter, either a passive crossover or a DSP. The PR T25-S frequency response is 2,500 Hz to 25,000 Hz with a resonance frequency of 1,400 Hz.
Q: What mounting parts come with the PR T25-S?
A: The box contains 2 x PR T25-S tweeters, 2 x aluminium flush mount housings, 2 x OEM spacers, 2 x standard grilles, 2 x exclusive HELIX grilles and mounting material.
Q: How much space do the PR T25-S tweeters need?
A: They need a 37.7 mm installation diameter and 10.6 mm installation depth.
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