Helix Compose i7 Ci7 W165FM-S3 Midbass 6.5 Inch FlexMount Speakers 150w RMS
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The Helix Ci7 W165FM-S3 is a pair of 6.5 inch (165 mm) midbass drivers rated at 150W RMS (225W max), from the Compose i7 series. Made in Germany, they feature a 3 ohm UHD paper cone and are compatible with the FlexMount165 system for fitting in the original mounting location.
Pair with the Ci7 T20FM-SC tweeter and either a DSP or the Ci7 FX-UNI.2 Flex-Crossover. Car-specific FlexMount165 adaptors and WireKits are available separately.
Key specifications
- Size: 6.5 inch / 165 mm midbass
- Power handling: 150W RMS, 225W max
- Impedance: 3 ohm
- Frequency response: 50 Hz – 3,500 Hz
- Sensitivity: 92 dB @ 2.83V / 1m, 88 dB @ 1W / 1m
- Voice coil: 37 mm
- Installation diameter: 142 mm
- Installation depth: 65.8 mm
Developed Inside the Vehicle
COMPOSE is HELIX's answer to modern car design. Developed inside the vehicle, for the vehicle, it blends universal speakers with the advantages of vehicle-specific systems.
3 Ohm Efficiency
Smart 3 ohm technology raises efficiency and maximum sound pressure. Impedances are matched to HELIX and MATCH amplifiers for full performance from every pairing.
Made in Germany
Drawing on know-how from HELIX's high-end sister brand BRAX, the i7 series is made entirely in Germany and tuned for uncompromising music enjoyment. Ultra High Damping (UHD) crafted paper cone technology completes the package.
Explore the full range in Helix Compose i7.
Specification
| Power handling | RMS / Max. P 150 / 225 Watts |
|---|---|
| Impedance | Z 3 Ω |
| Frequency response | 50 Hz - 3,500 Hz |
| Sensitivity | SPL 92 dB @ 2.83 V / 1m 88 dB @ 1W / 1m |
| Cone | area Sd 131 cm² |
| Cone | material Ultra high damping (UHD) crafted paper cone |
| Voice coil | diameter ø 37 mm |
| Voice coil | winding height 13.4 mm |
More specs
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What's Included
- 2 x Ci7 W165FM-S3
- 2 x Connection cable
- 2 x Mounting material
Helix
About the Helix CI21602
From our tech experts at CEN
The Helix Ci7 W165FM-S3 is a pair of 6.5 inch (165 mm) midbass drivers from the Compose i7 series, made in Germany. They handle 150 W RMS and 225 W maximum at 3 ohms, with Ultra High Damping paper cones, 37 mm voice coils and a 50 Hz to 3.5 kHz response.
Who it suits
Door upgrades in an i7 front stage where you want strong, controlled midbass from the factory 6.5 inch position. They need a 142 mm cut-out and 65.8 mm of depth, and car-specific FlexMount165 adaptors are sold separately. For 5.25 inch openings, see the Ci7 W130-S3.
Our tech experts advise
There is no crossover in the box, so use a DSP channel or the Ci7 FX-UNI.2 with the Ci7 T20FM-SC tweeter. The 3 ohm load lets an amplifier deliver more power, so check it is stable. Door deadening makes a clear difference. Get in touch.
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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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: What is the installation depth of the Ci7 W165FM-S3?
A: The installation depth is 65.8 mm and the installation diameter is 142 mm.
Q: Does the Ci7 W165FM-S3 work with FlexMount adaptors?
A: Yes. It is designed for the optionally available car-specific FlexMount165 adaptors, which allow acoustically optimised fitting in the vehicle's original speaker location, and for car-specific WireKits.
Q: What tweeter goes with the Ci7 W165FM-S3?
A: Within the COMPOSE i7 range it pairs with the Ci7 T20FM-SC tweeter, run either actively from a DSP or passively through the Ci7 FX-UNI.2 crossover.
