Alpine S-S40 S-Series 4" Coaxial Speakers

Alpine 4" Coaxial S Series speakers.

Sound Garage, the home of Alpine in the Northern Suburbs.

SKU: S-S40



Alpine S-S40

S-Series 4" Coaxial Speakers

Their extreme efficiency makes them perfect for OEM upgrades

The all-new Alpine S-S40 S-Series speakers are forged with new materials and innovative manufacturing techniques to deliver amazing sound quality beyond their price range. They feature Alpine’s HAMR surround for high linearity and accuracy, as well as a new patented CFRP cone for excellent clarity and responsiveness. Their extreme efficiency makes them perfect for OEM upgrades, plus with many sizes available they suit a wide variety of vehicles.

Industry First CFRP Woofer Cone Alpine HAMR Surround
The Alpine S-Series speakers set an industry first, utilising CFRP (Carbon Fiber Reinforced Plastic), a very lightweight yet rigid material. On an ordinary oval cone, the edges are naturally weaker than the centre due to the elongated shape. However, CFRP material is directional and can be manipulated during the moulding process to strengthen the areas of the cone that are normally weak. The result is rigidity throughout the cone that delivers accurate and efficient performance. Alpine’s patented H.A.M.R. (High Amplitude Multi-Roll) surround is now found on the S-Series speakers. This proven technology increases excursion while maintaining accuracy and linearity. The multi-roll design allows an even unfolding of the surround, which creates incredible linearity and colourisation rejection.
Powerful Speaker Motor 4×6 Inch Speaker Adapter Plate
The Alpine S-S40 S-Series coaxial speakers are undeniably powerful, featuring a large voice coil. The 4-inch models have a 25-mm voice coil, at such a large size, this incredible voice coil increases the driving power and control of the motor. The Alpine S-S40 S-Series Coaxial Speaker is an extremely versatile speaker, it’s ready to install into a standard 4-inch speaker location, as well as a 4×6 inch speaker installation with the included multi-fit adapter plate.


Sound Garage, is your Alpine Car Stereo Specialist, Stockist and Installation Centre in the Northern Suburbs of Brisbane.

Alpine S-S40 - Features


  • CFRP (Carbon Fiber Reinforced Plastic) cone with specialised rubber surround
  • HAMR (High Amplitude Multi-Roll) Surround
  • 25 mm Voice Coil
  • Magnet Material: Ferrite


  • Tweeter Type: 1″ Wide-Range Silk Dome
  • Magnet Material: Neodymium

Crossover Network

  • Grade: 2nd order Network Design

Alpine S-S40 - Specifications

Power Handling

  • Peak Power: 140 Watts
  • RMS Power: 45 Watts (CTA-2031 Compliant)

Dimensions Woofer

  • Frame 102 mm
  • Mounting Depth: 43 mm
  • Mounting Height: 13.3 mm
  • Magnet: 75.0 mm


  • Frequency Range: 97 Hz – 22 kHz
  • Impedance: 4 Ohms
  • Sensitivity: 86 dB/W



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