RS Speakers W 174.38 Fibonacci 6.5" woofer

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The RS Speakers W 174.38 Fibonacci 8Ω is a 6.5-inch bass-midrange driver distinguished by its innovative design and patented technology, delivering uncompromising sonic fidelity. Developed in Italy, this woofer features a specially shaped paper cone based on the Fibonacci sequence, combined with advanced damping treatments and a sophisticated suspension system. The result is a transducer that excels in both musical precision and dynamic performance – the ideal choice for audiophiles and professional loudspeaker builders seeking premium components for their next project.
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Highlights

• Specially developed paper membrane with patented Fibonacci technology for resonance control
• Double surface damping treatment and acrylic-coated membrane for balanced stiffness and damping.
• Rubber surround with Double Asymmetric Rolls technology ensures symmetrical stroke
• A 1.5-inch voice coil on a fiberglass former provides mechanical stability at high temperatures.
• Includes sealing gasket, mounting screws and thumb nuts for easy installation.

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Product details

RS Speakers W 174.38 Fibonacci 8Ω 6.5" woofer

At the heart of the W 174.38 Fibonacci 8Ω lies its unique para-elliptical paper diaphragm, precisely shaped and laser-engraved according to the Fibonacci sequence. This innovative design, inspired by the mathematical Golden Ratio, significantly reduces unwanted resonance modes in the diaphragm, resulting in a smooth and balanced frequency response. The diaphragm is further enhanced with an acrylic coating on the front and a damping layer on the back, creating a sandwich structure that optimally balances rigidity and internal damping. This meticulous engineering guarantees a pure, unadulterated sound with exceptional clarity.

The mechanical design of this woofer is also impressive. A rubber surround with Double Asymmetric Rolls technology and a meticulously crafted Conex spider with progressive waves enable both symmetrical excursion and excellent control at high levels. The 1.5-inch voice coil is wound on a fiberglass former, ensuring mechanical stability and performance even under demanding, high-temperature conditions. These features guarantee the woofer's durability and reliability, making it ideal for intensive use in loudspeakers and high-performance subwoofer applications.

The RS Speakers W 174.38 Fibonacci 8Ω features a robust ferrite magnet system with an integrated aluminum interference suppression ring to reduce coil inductance and minimize harmonic distortion. Strategically placed vents in the magnet and voice coil further reduce power loss and turbulence, while the free-compressed basket with thin struts eliminates back reflections that could degrade sound quality. These thoughtful details contribute to a highly efficient and responsive driver suitable for both bass-reflex and sealed enclosures.

With its combination of advanced technology and high-quality materials, the RS Speakers W 174.38 Fibonacci 8Ω is an excellent choice for audiophile DIY speaker kit projects, professional speaker systems, and high-end home audio installations. Its precise manufacturing and focus on acoustic purity make it an outstanding component for anyone looking to elevate their listening experience with state-of-the-art transducer technology.

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Technical Specifications

• Article number: W 174.38 Fibonacci
• woofer series Fibonacci
• woofer type Woofer
• Nominal diameter 6.5" | 174 mm
• Resilience (QMW) 130 W
• Continuous Program Power 260 W
• Impedance (Z) 8 Ω
• Sensitivity (SPL at 1m / 2.83V) 88.9 dB
• Voice coil diameter 38 mm
• Weight magnet 930 g
• DC resistance (Re) 5.2 Ω
• Voice coil induction (Le) 0.45 mH
• Resonance frequency (Fs) 37.6 Hz
• Mechanical quality (Qms) 9.83
• Electrical quality factor (Qes) 0.39
• Total quality (Qts) 0.38
• Moving mass (mms) 16.7 g
• Suspension compliance (Cms) 1073 µm/N
• Membrane area (Sd) 122.7 cm²
• Force factor (BL) 7.24 Tm
• Equivalent volume (Vas) 22.9 L
• Maximum displacement (Xmax) 6.0 mm
• Cone / Diaphragm Material paper
• Bead material Rubber
• Voice coil wire material Copper
• Voice coil mold material Fiberglass
• Basket/frame material Aluminum die-cast
• Magnetic material Ferrite
• Outer diameter 175 mm
• Total depth 82.5 mm
• Cutout diameter 143 mm
• Bolt Circle Diameter 164.2 mm
• Mounting holes 8
• Mounting hole diameter 4.2 mm
• Bass reflex volume 18 L
• Bass reflex F3 40 Hz