Helix Ci7 W200FM-S3 – 200 mm High-End Woofer with FlexMount200
The Ci7 W200FM-S3 is an 8″ (200 mm) high-end woofer from the HELIX COMPOSE platform, which re-engineers universal speakers so they combine universal flexibility with vehicle-specific advantages – “developed inside the vehicle, for the vehicle”. The i7 series is the high-end line of COMPOSE, made in Germany and clearly influenced by the sister brand BRAX; its impedances are matched to HELIX and MATCH amplifiers. Its 3 Ω design increases efficiency and maximum sound pressure, making it suited for 8″ bass positions in high-quality systems.
Despite its small outer diameter of 195 mm, the woofer offers the cone area known from typical 200 mm chassis (Sd 201 cm²). It uses the handmade UHD (Ultra High Damping) paper cone and a basket made of polymer composite reinforced with glass beads – rigid, low in self-resonance, with reduced magnetic flux modulation and good thermal resistance, allowing a more compact basket. A 37 mm voice coil, FlexMount200 compatibility and the ProConnect terminal for WireKits round out the design.
Key Features
- 3 Ω technology: higher amplifier output and efficiency with HELIX and MATCH amplifiers.
- UHD paper cone: handmade Ultra High Damping cone for excellent impulse and frequency response.
- Full cone area, compact chassis: same cone area as typical 200 mm chassis despite the smaller outer diameter.
- Glass-bead reinforced polymer basket: high rigidity and minimal ringing.
- Rubber surround: for high linear cone excursion (Xmax ±3.9 mm).
- Polyurethane dustcap: lightweight polyurethane dustcap on the UHD cone.
- 37 mm voice coil: for thermal stability and high power handling.
- Powerful magnet system: for high efficiency and low distortion.
- ProConnect terminal: automotive-grade, interlocked, reverse-polarity protected; for standard cables, flat-plug adaptor cables or WireKits.
- FlexMount200: car-specific adaptor rings for installation in the original mounting position.
- Made in Germany: part of the German-made COMPOSE i7 series.
Drivers & Construction
- Cone: UHD crafted paper, cone area (Sd) 201 cm².
- Voice coil: 37 mm diameter, 13.8 mm winding height.
- Basket: polymer composite reinforced with glass beads.
- Surround / dustcap: rubber surround, polyurethane dustcap.
- Terminal: ProConnect.
Acoustic Performance
- Power handling: 150 W RMS / 225 W max.
- Impedance: 3 Ω (DC resistance 3.0 Ω).
- Sensitivity: 92 dB @ 2.83 V / 1 m; 88 dB @ 1 W / 1 m.
- Frequency response: 35 – 2,500 Hz.
- T/S parameters: Fs 52 Hz, Qms 6.04, Qes 0.78, Qts 0.69, Vas 20.8 l, Cms 370 µm/N, BxL 5.6 Tm, Mms 25.6 g, Rms 1.40 kg/s.
- Max. linear excursion (Xmax): ±3.9 mm.
Installation Notes
- Dimensions: outer diameter 195 mm (7.68″), installation diameter 173.5 mm (6.83″), installation depth 65.8 mm (2.59″).
- FlexMount200: optional adaptor rings for the original mounting position in many vehicles.
- WireKits: optional adaptor cables for plug-and-play connection to the original harness or to a crossover.
Technical Specifications
| Power handling RMS / Max. | P |
150 / 225 Watts |
| Impedance | Z | 3 Ω |
| DC resistance | Re | 3.0 Ω |
| Frequency response | 35 Hz – 2,500 Hz | |
| Resonance frequency | Fs | 52 Hz |
| Mechanical Q factor | Qms | 6.04 |
| Electrical Q factor | Qes | 0.78 |
| Total Q factor | Qts | 0.69 |
| Compliance | Cms | 370 µm/N |
| Equivalent air volume | Vas | 20.8 L |
| Force factor | B*I | 5.6 Tm |
| Sensitivity | SPL | 92 dB @ 2.83 V / 1m 88 dB @ 1W / 1m |
| Cone area | Sd | 201 cm² |
| Moving mass | Mms | 25.6 g |
| Cone material | Ultra high damping (UHD) crafted paper cone | |
| Mechanical resistance | Rms | 1.40 kg/s |
| Voice coil diameter | ø | 37 mm |
| Voice coil winding height | 13.8 mm | |
| Max. linear excursion | Xmax | +/- 3.9 mm |
| Outer diameter | ø | 195 mm / 7.68″ |
| Installation diameter | ø | 173.5 mm / 6.83″ |
| Installation depth | 65.8 mm / 2.59″ | |
| Features | ProConnect terminal, FlexMount200 |
Scope of Delivery
2 x Ci7 W200FM-S3
2 x Connection cable
2 x Mounting material
