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Helix Compose i7 - Ci7 T20FM-SC

Ci7 T20FM-SC
Helix Compose i7 High-End silk dome Tweeter with coupling volume 20mm
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Helix compose i7 High-End tweeter with hand-coated silk dome and coupling volume.

Helix Compose highlights best quality, excellent manufacturing and state-of-the-art sound quality.
Thanks to more than 30 years of experience in research and development of audio products Helix Compose sets new standards in the car audio speaker market.

Brilliant treble response
Our i7 tweeter is equipped with a fine-meshed silk dome with visco-elastic Acronal coating on both sides, guaranteeing a brilliant and smooth treble response. In addition, the integration of pure lamb’s wool and dampened coupling volume enables a very low resonance frequency and allows a deep acoustic coupling.

FlexMount20 – Universal meets car-specific
FlexMount is a mounting system based on specially developed adapter rings, allowing the installation of COMPOSE FlexMount speakers in an almost infinite number of vehicles. Thus, the universal tweeter effortlessly becomes a vehicle-specific tweeter, that can be easily installed in the original installation position of the vehicle in an acoustically optimized way with the matching FlexMount20 adapter ring.


Super-wide dispersion 0.75” / 20 mm high-end silk dome tweeter with coupling volume for lowest possible resonance frequency

Exceptionally lightweight and fine-meshed silk dome ensures brilliant and smooth treble response

High efficient neodymium magnet for high magnetic flux linearity

Integrated, dampened coupling volume allows a low crossover frequency thanks to its low resonance frequency

Sturdy Aluminum housing turned from solid

Compact design and various mounting options for various installation demands

Mounting pods for flush mount and angle mount included in delivery

Designed for the optionally available car-specific FlexMount20 adaptors which allow an acoustically optimized and professional integration in the original mounting location of the vehicle

Made in Germany

Mounting options:

Option a: Flus mount

Option b: Angle mount

Option c: Professional integration with optionally available FlexMount 20 car specific adaptor ( sold separately )


Size without housing:
Tweeter outer Ø 32.00
Mounting Ø 27.2mm
Mounting depth: 19mm

Impedance: 4 Ohm
DC resistance: ( Re ) 3.4 Ohm
Frequency response: 1500 Hz - 30000 Hz
Sensitivity ( SPL ): 93 dB @ 2.83V / 1m, 90 dB @ 1W / 1m
Voice coil diameter: 20mm
Cone material: Silk dome with coupling volume

Recommended crossover frequencies for the highpass:

Slope 6dB/octave│minmum crossover frequency 4000Hz

Slope 12 dB /octave│minmum crossover frequency 3000Hz

Slope 24 dB /octave│minmum crossover frequency 2500Hz


Scope of delivery
2 x Ci7 T20FM-SC
2 x Tweeter flush mount
2 x Tweeter pod
2 x Extension cable
2 x Mounting material