Helix Compose
Helix Compose is a modular car speaker platform built around the FlexMount system — vehicle-specific adaptor rings that allow speakers to drop directly into original factory positions without cutting or fabricating new mounts. It suits drivers who want a clean, high-quality audio upgrade that installs in place of the original speakers.
Priced from £12.99, the range covers component sets, coaxial speakers, midrange drivers, tweeters and hybrid subwoofers across the Compose Basic, i3, i5 and i7 series, along with vehicle-specific adaptor rings and passive crossovers to complete a system.

Vehicle fit finder
Find the HELIX COMPOSE speakers for your car
Choose your make, model and year to see which HELIX COMPOSE speakers and FlexMount adapters fit each position in your car.
Based on Audiotec Fischer’s HELIX FlexMount Finder. Open the manufacturer’s finder


High-End Made in Germany
Our HELIX COMPOSE i7 series represents uncompromising high-end for an outstanding sound experience in the automobile. With obvious influence of the highly praised sister brand BRAX, the i7 speaker series is the undisputable peak of the HELIX COMPOSE lineup, completely made in Germany and optimized for uncompromising music enjoyment. A sonic delight for even the most ambitious music enthusiasts.All speaker impedances are perfectly matched for the combination with our HELIX and MATCH amplifiers, guaranteeing maximum performance at any time.Of course, the i7 series is compatible with all HELIX COMPOSE technologies such as FlexMount, FlexConnect, ProConnect, COMPOSE Connect and the WireKits. All components of the i7 speaker series are available individually, enabling the assembly of each system concept according to individual needs and thus meeting the highest musical requirements.
The 100 mm / 4” COMPOSE speaker particularly stands out due to its flat design and large diaphragm area and its extraordinarily powerful, highly efficient push-pull nodymium magnet systems, delivering a dynamic, controlled midrange reproduction.
The super-wide dispersion tweeter is equipped with a fine-meshed silk dome, guaranteeing a brilliant and smooth treble response. In addition, the integration of unique acoustic insulation materials and dampened coupling volume allows a deep acoustic coupling.
Our i7 crossover offers maximum flexibility with many configuration options and is therefore suited for any combination of tweeters and midrange / woofers, assuring an easy and professional integration. The “Flex-Crossover” design, enables an installation with separate tweeter and midrange / woofer mounting positions.
Explore the whole i7 lineup!


The sound sensation for sophisticated music lovers
The HELIX COMPOSE i5 series is the link between i7 and i3, created for sophisticated music lovers with a sparked ambition for a true hi-fi experience. This series is the lovechild of phenomenal sound and unmatched practicality. Our i5 speakers are nothing less than real highlights in their segments as well as true problem solvers: The 200 mm / 8” speaker is a fusion of a mid-woofer driver and subwoofer and comes with an extraordinary flat installation depth, allowing the creation of hi-fi concepts without the particular need of an additional subwoofer in the trunk. Another highlight is the 25 mm / 1” tweeter with an aluminum dome coated with ceramic and an outstanding high frequency reproduction. As you would expect, our i5 speakers come with compatibility to our COMPOSE-exclusive mechanical technologies: FlexMount, FlexConnect, ProConnect, COMPOSE Connect and the WireKits.
Despite the larger diameter of 25 mm / 1”, the Ci5 T25FM-CA has an excellent wide dispersion and off-axis response, allowing the creation of an impressive sound image and stage – even in OEM installation spots. With its ceramic-coated aluminum cone, it features a balanced frequency response and excellent decay characteristics. As a result, high frequencies are reproduced even more clearly and realistically.
This 200 mm / 8” hybrid loudspeaker called Ci5 S200FM is the perfect balancing act between a midwoofer driver and subwoofer and offers exceptionally high excursion, power handling and output volume. The FlexMount200 technology ensures that it can be installed under the seats (BMW) or as a front subwoofer (MB), making it the ideal problem solver and perfect for difficult applications.
The particularly shallow installation depth of only 47 mm brings completely new, comfortable integration possibilities to the table – thus saving time, space and money. And don’t underestimate its performance: The Ci5 S200FM offers +/- 7.8 mm linear excursion, assuring a controlled and clear sonic reproduction even at high sound pressure levels and low frequencies.
Explore the whole i5 lineup!


The performance highlight
The HELIX COMPOSE i3 series is an absolute priceperformance highlight, engineered in Germany. As you would expect, this series matches great sound with high performance and intelligent integration possibilities: Equipped with the same smart features as i7, all mechanical highlights such as FlexMount, FlexConnect, ProConnect, COMPOSE Connect and WireKits are fully integrated. All speaker impedances are perfectly matched for the combination with our HELIX and MATCH amplifiers, guaranteeing maximum performance and efficiency at any time. Our i3 speakers are available as single speakers as well as component and coaxial speaker systems. Additionally, almost all i7 and i3 components can both be versatilely combined in a HELIX COMPOSE sound system, granting maximum flexibility in the choice of speaker combinations as well as customer budgets.
Thanks to the innovative Cenosphere cone, an extremely efficient magnet system and a tweeter with an exceptionally stable titanium dome, i3 guarantees a first-class sound experience. Next to the full compatibility with the mechanical technologies of the COMPOSE lineup, the i3 speaker baskets share the same technological specs with i7 and i5.
The highly efficient 3 Ohms technology ensures maximum sound pressure. Certain models are also available as 2 Ohms variants, assuring the absolute maximum performance of the speaker in combination with our HELIX & MATCH amplifiers.
This universal crossover, optimized for use with the i3 components and suited for any combination of tweeters and midrange / woofers. Its compact dimensions facilitate installation in confined spaces. It’s also equipped with COMPOSE Connect and WireKit technologies.
Explore the whole i3 lineup!


Essentials for an exceptional sound experience
You might have already guessed from the name: our BASIC series is the perfect introduction to the world of HELIX COMPOSE, providing all the essentials for an exceptional sound experience in your vehicle.
Get ready for high performance, great dynamics, an impressive sound reproduction as well as integration intelligence – all combined in one extensive speaker lineup.
As soon as you enter the world of HELIX COMPOSE, a dynamic high frequency reproduction is a must for an all-around exciting music experience. The BASIC tweeter uses a coated silk dome and is furthermore equipped with the same mechanical construction intelligence as i7, i5 and i3, creating full compatibility with the FlexMount technology.
True to our high efficiency concept, BASIC relies on 3 Ohms technology. All components harmonize perfectly and form an ideal team with our HELIX and MATCH amplifiers, guaranteeing high output levels with a powerful bass performance at all times.
Our BASIC series offers you the most extensive number of speakers with a variety of shapes and concepts in our HELIX COMPOSE lineup, allowing it to be used in even more unusual installations. Speaker kits, coaxial systems, oval shapes – We’ve got all of the tools for your perfect composition.
Explore the whole BASIC lineup!

Universal meets car-specific
With the launch of the HELIX COMPOSE platform, we introduced our patented mounting system called FlexMount, which is based on especially developed adaptor rings. This technology allows you to install our i7, i5 and i3 speakers, as well as the BASIC tweeter, in an almost infinite number of car models – simply by swapping the optionally available adaptor ring. Thus, the universal loudspeaker effortlessly becomes a vehicle-specific loudspeaker, that can be easily installed in the original installation position of the vehicle in an acoustically optimized way. Depending on the specific COMPOSE speaker, said adaptor rings are either included or optionally available. We’re consistently working on expanding our FlexMount lineup while also offering free FlexMount 3D model downloads for individual customization, granting a high-grade of flexibility for our customers.
These adaptors allow mounting of all COMPOSE tweeters in the OEM installation position. We focused on developing an ideal adaptor design to give the wide dispersion COMPOSE tweeters maximum sound optimization.
This exclusively patented technology transforms the i7 and i3 midrange drivers into vehicle-specific loudspeakers with only one twist. The extremely flat design of the COMPOSE midrange speakers allows a high-quality sound upgrade even in tight spaces.
FlexMounts are also available for the larger COMPOSE drivers. They are 3D printed in Germany, offer great stability as well as an automotive standard connection. With enclosed screws and seals, integrating the COMPOSE 165 and 200 speakers is child’s play.

One terminal for all cases
Speakers with our FlexConnect terminal can easily be connected directly to the original wiring harness of the vehicle, maintaining the automotive standard of the plug connection as well as guaranteeing reverse polarity protection. Accordingly, there’s no need to cut any cables or damage any of the original equipment. Similar to our FlexMount system, this technology relies on specially developed, vehicle-specific adaptors.

The new industry standard
Our innovative ProConnect terminal is the new industry standard: A professional, automotive connector, allowing the secure use of conventional speaker cables, while also being ideally designed for operation with our WireKits. Furthermore, the connection is interlocked, offers reverse polarity protection and is electrically and mechanically highly resilient.
Bundle & Save on Helix Compose
Helix Compose at a glance
- Compose i7 — flagship series, made in Germany; 6.5 inch midbass (150W RMS), 8 inch woofer (150W RMS) and 0.75 inch silk dome tweeters; from £349.99
- Compose i5 — 2 inch and 3 inch wideband speakers, 6.5 inch midbass (125W RMS), 8 inch hybrid subwoofers (200W RMS) and 1 inch aluminium dome tweeters; from £124.99
- Compose i3 — widest range; 4 inch, 5.25 inch, 6.5 inch and 8 inch coaxial and component sets plus standalone woofers and tweeters, rated 80–100W RMS; from £69.99
- Compose Basic — 6.5 inch two-way component speaker kit, 80W RMS; £179.99
- FlexMount adaptor rings — vehicle-specific rings for BMW, Mini, Porsche, Mercedes, Jaguar, Land Rover, VW, Skoda, Seat, Peugeot and Citroën; from £12.99
- Ci3 FX-UNI.2 crossover — passive 2-way crossover for Compose i3 drivers with 6-stage tweeter level adjustment; £69.99
Which Helix Compose should I choose?
The Compose i3 is the most comprehensive series, covering 4 inch to 8 inch options in coaxial, component and standalone woofer formats at 80–100W RMS. The Compose i5 steps up with more advanced drivers, including 6.5 inch midbass at 125W RMS and 8 inch hybrid subwoofers at 200W RMS suited to under-seat positions in BMW, Mini and Mercedes. The Compose i7 is the flagship, made in Germany, with 6.5 inch and 8 inch woofers rated at 150W RMS. The Compose Basic is a more straightforward entry point with a 6.5 inch component kit at 80W RMS.
Whichever series you choose, the right FlexMount adaptor ring is what delivers a vehicle-specific fit. Rings are sold separately from £12.99 and cover BMW, Mini, Porsche, Mercedes, Jaguar, Land Rover, VW, Skoda, Seat, Peugeot and Citroën. Most speakers also include universal FlexMount rings for a general installation.
Helix Compose FAQs
Q: What is the difference between the Compose i3, i5 and i7 series?
A: The i3 is the widest range, with 4 inch to 8 inch coaxial and component options at 80–100W RMS; the i5 adds more advanced drivers including 125W RMS midbass and 200W RMS hybrid subwoofers; the i7 is the flagship, made in Germany, with 6.5 inch and 8 inch woofers rated at 150W RMS.
Q: Do I need to buy FlexMount adaptor rings separately?
A: Most Helix Compose speakers include universal FlexMount rings; vehicle-specific rings for BMW, Mini, Porsche, Mercedes, Jaguar, Land Rover, VW, Skoda, Seat, Peugeot and Citroën are sold separately from £12.99.
Q: What is the difference between the Ci5 S200FM-S2 and S200FM-D2?
A: Both are 8 inch FlexMount hybrid subwoofers rated at 200W RMS; the S200FM-S2 has a single voice coil (1x2 ohms) while the S200FM-D2 has a dual voice coil (2x2 ohms).
Q: Which Compose products are designed for BMW and Mini?
A: The Compose i5 underseat subwoofer set is built specifically for BMW and Mini factory under-seat positions, and FlexMount adaptor rings are available in BMW and Mini-specific versions for 20mm tweeters, 4 inch midranges and 8 inch subwoofers.
Q: Can CEN fit Helix Compose speakers at their Nottingham workshop?
A: Yes — CEN has its own fitting workshop in Beeston, Nottingham, where the team can professionally install Helix Compose speakers and FlexMount adaptors in your vehicle.
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