RS Speakers MW 174.38 Fibonacci 6.5" woofer

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The RS Speakers MW 174.38 Fibonacci is a meticulously engineered 6.5-inch bass-midrange driver for discerning audio enthusiasts and professionals who demand both innovation and musicality. Featuring patented "Fibonacci" technology and a precision-crafted paper cone, this midrange driver delivers exceptionally clear, resonance-free performance. Its unique combination of advanced materials and sophisticated construction makes it an outstanding choice for high-end loudspeakers and DIY projects seeking pure, balanced sound.

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Highlights

• Patented Fibonacci paper membrane for reduced resonances and increased stiffness
• Double asymmetric rubber surround ensures symmetrical stroke
• Aluminum phase connectors extend the frequency range and improve the crossover frequency smoothness.
• Ventilated magnetic system with demodulation ring minimizes compression and distortion.
• Includes sealing gasket, mounting screws and thumb nuts for easy installation.

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Product details

RS Speakers MW 174.38 Fibonacci 6.5” midrange driver 8Ω

The MW 174.38 Fibonacci impresses with its innovative diaphragm, manufactured with a custom-designed para-elliptical profile and a laser-engraved surface based on the Fibonacci sequence. This architectural approach, combined with double-sided damping treatment, creates a "sandwich" structure that optimally balances stiffness and damping. The result is a reduction in unwanted resonance modes and an incredibly natural, detailed sound signature that excels in both the bass and midrange frequencies.

Designed for demanding audio applications, this woofer features a 1.5-inch voice coil on a fiberglass former, ensuring stability even at high temperatures and dynamic loads. The advanced magnetic circuit with a ferrite magnet and aluminum demodulation ring guarantees a highly symmetrical magnetic field and reduced inductance for lower harmonic distortion. These improvements make the MW 174.38 an outstanding choice for woofers in audiophile systems and custom installations.

Another key feature is its flexible installation: The open basket with thin struts minimizes rear reflections and maximizes airflow. The robust die-cast aluminum frame, progressive Conex spider, and NBR butyl rubber surround with a double-wave profile ensure precise diaphragm movement and durability. With an efficiency of 90.2 dB and an AES rating of 130 W, this driver is ready for use in both 2-way and 3-way loudspeaker designs.

Whether you're building high-performance home audio systems or custom DIY speaker kits , the RS Speakers MW 174.38 Fibonacci guarantees uncompromising sound quality and reliability. Its extended frequency response and optimized phase connector allow for seamless integration with tweeters , while the included mounting hardware and gasket simplify installation. For those seeking premium components for their next audio project, this driver combines Italian design with acoustic innovation.

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Technical Specifications

• Article number: MW 174.38 Fibonacci
• woofer series Fibonacci
• woofer type Mid 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) 90.2 dB
• Voice coil diameter 38 mm
• Weight magnet 930 g
• DC resistance (Re) 5.2 Ω
• Voice coil induction (Le) 0.32 mH
• Resonance frequency (Fs )45.6 Hz
• Mechanical quality (Qms) 6.64
• Electrical quality factor (Qes) 0.42
• Total quality (Qts) 0.39
• Moving mass (mms) 13.9 g
• Suspension compliance (Cms) 876 µm/N
• Membrane area (Sd) 122.7 cm²
• Force factor (BL) 7.03 Tm
• Equivalent volume (Vas) 18.7 L
• Maximum displacement (Xmax) 4.5 mm
• Cone / Diaphragm Material paper
• Bead material Rubber
• Voice coil wire material aluminum
• 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 50 Hz