Helix Compose i5 Ci5 M80FM-S3 Midrange Speakers 3 Inch 80 mm FlexMount 90w RMS
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The Helix Ci5 M80FM-S3 is a pair of 3-inch (80 mm) midrange speakers from the Helix Compose i5 series, rated at 90 W RMS and 135 W max, with a 3-ohm impedance and the FlexMount system for straightforward fitting in factory speaker positions.
This listing is the M80FM-S3 midrange. The Compose i5 range also includes the Ci5 T25FM-CA 1-inch aluminium dome tweeters.
Key specifications
- Size: 3 inch (80 mm) midrange, supplied as a pair
- Power handling: 90 W RMS, 135 W max
- Impedance: 3 ohms
- Frequency response: 200 Hz to 6,000 Hz
- Sensitivity: 92 dB @ 2.83 V / 1 m (88 dB @ 1 W / 1 m)
- Cone: silicon coated paper
- Installation depth: 30.2 mm
- Mounting: FlexMount80 (FlexMount100 with optional CFMK80-100 adapter)
Developed Inside the Vehicle
Compose is Helix's answer to modern car design. Developed inside the vehicle, for the vehicle, it combines universal speakers with the advantages of vehicle-specific systems — making it straightforward to add a dedicated midrange to an active or multi-way car audio setup.
3 Ohm Efficiency
The 3-ohm design raises efficiency and maximum sound pressure. Impedances are matched to Helix and Match amplifiers, ensuring the pairing always delivers full performance.
FlexMount Fitting
The FlexMount system simplifies installation across a wide range of vehicles and factory speaker positions. The standard FlexMount80 bracket is included; upgrading to FlexMount100 requires the optional CFMK80-100 adapter kit.
Explore the full range in Helix Compose i5.
Specification
| Power handling | RMS / Max. P 90 / 135 Watts |
|---|---|
| Impedance | Z 3 Ω |
| Frequency response | 200 Hz - 6,000 Hz |
| Sensitivity | SPL 92 dB @ 2.83 V / 1m |
| Cone | area Sd 36 cm² |
| Cone | material Silicon coated paper cone |
| Voice coil | diameter ø 20 mm |
| Voice coil | winding height 7 mm |
More specs
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What's Included
- 2 x Ci5 M80FM-S3
- 2 x Universal FlexMount CFM80 MULTI.1 & MULTI.2
- 2 x Universal connection cable
- 2 x FlexConnect inlay set (A, B, C, D)
- 2 x Speaker gasket
- 2 x Mounting ring with grille
- 1 x Mounting material
Helix
About the Helix CI21300
From our tech experts at CEN
The Helix Ci5 M80FM-S3 is a pair of 3 inch (80 mm) midrange speakers from the Compose i5 series, rated at 90 W RMS and 135 W maximum at 3 ohms. They cover 200 Hz to 6 kHz with 92 dB sensitivity and need 30.2 mm of installation depth.
Who it suits
Three-way front stages where the midrange sits in a dash or pillar position, between an i5 tweeter and a door midbass. They fit FlexMount80 positions, or FlexMount100 with the optional CFMK80-100 adaptor. Pair them with the Ci5 T25FM-CA tweeters.
Our tech experts advise
They need band-pass filtering from a DSP or suitable crossover, as they are not built for deep bass. For a dash centre position in a car with eCall, choose the Ci5 M80FM-D3 CTR instead. 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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Have it Fitted By Our Team
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.
- 1
Tell us your vehicle
Make, model and year, and what you'd like fitted.
- 2
We confirm the parts
Fascia, wiring and interfaces checked for your car, with a fitted price.
- 3
Fitted at our workshop
Bring it to our Beeston workshop and we do the rest.
Unit 25 Technology Drive, Beeston, Nottingham NG9 1LA
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Helix Compose i5 Ci5 W165FM-S3 Midbass Woofer 6.5 Inch FlexMount 125w RMS
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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 impedance is the HELIX Ci5 M80FM-S3?
A: The Ci5 M80FM-S3 is a 3 ohm midrange speaker. HELIX matches the impedance to HELIX and MATCH amplifiers for full performance.
Q: What frequency range does the Ci5 M80FM-S3 cover?
A: It covers 200 Hz to 6,000 Hz, so it is used as a dedicated midrange alongside a separate woofer and tweeter.
Q: What is included with the HELIX Ci5 M80FM-S3?
A: Two Ci5 M80FM-S3 speakers, two universal FlexMount CFM80 MULTI.1 and MULTI.2 adaptors, two universal connection cables, two FlexConnect inlay sets (A, B, C, D), two speaker gaskets, two mounting rings with grilles and mounting material.
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