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Rockford Fosgate P18S4

Punch Stage 1 8" 4-ohm subwoofer

Item # 575P18S4

With a slick look and strong sound, Punch Stage 1 subwoofers are the way to get the aggressive bass of Rockford...

With a slick look and strong sound, Punch Stage 1 subwoofers are the way to get the aggressive bass of Rockford...

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Discontinued item

Item # 575P18S4

Hunter
Need help?
Contact our Virginia-based experts.

About the Rockford Fosgate P18S4

With a slick look and strong sound, Punch Stage 1 subwoofers are the way to get the aggressive bass of Rockford Fosgate in your vehicle. The molded polypropylene woofer cone with a foam surround delivers strong, accurate bass. The stamped steel basket is stepped for full woofer excursion, while a 1-1/2" aluminum voice coil is used for reliable power handling.

Got enough juice? Get an amp for your new sub With a slick look and strong sound, Punch Stage 1 subwoofers are the way to get the aggressive bass of Rockford Fosgate in your vehicle. The molded polypropylene woofer cone with a foam surround delivers strong, accurate bass. The stamped steel basket is stepped for full woofer excursion, while a 1-1/2" aluminum voice coil is used for reliable power handling.

The P18S4 8" subwoofer handles up to 150 watts RMS, and works best in a small sealed enclosure.

Details:
  • 8" 4-ohm subwoofer
  • molded polypropylene woofer cone
  • power range: 50-150 watts RMS (300 watts peak power)
  • frequency response: 40-250 Hz
  • sensitivity: 83 dB
  • top-mount depth: 4-1/16"
  • sealed box volume: 0.25 cubic feet
  • ported box volume: 0.65 cubic feet
  • Recommended Q-Logic Box Type: 1
  • warranty: 1 year

Priced per speaker
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What's in the box:

  • 8" woofer
  • 1 Concealing ring
  • 4 Self-adhesive foam gasket sections
  • Installation and Operation manual (English/French/Spanish/German/Italian)
  • "Team RF" window sticker
MFR #P18S4

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Crutchfield response

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Features
Enclosure Compatibility

Features

Woofer: The cone is constructed of molded polypropylene. Polypropylene is lightweight and strong, giving the woofer high power handling and low distortion.

High Excursion Large Roll Surround: A large edge roll surround allows Punch woofers to produce 20% more linear excursion than standard surrounds, resulting in more bass output.

Parabolic Triangular Cone Geometry Support System: By bonding a polypropylene parabolic dust cap of equivalent size to the cone body, a balanced triangular structure is created. This system reduces piston flex and eliminates cone distortion.

Linear Spider: A compliant linear spider improves mechanical stability under high excursion, maintaining consistent excursion characteristics. This eliminates the need for a "break-in period."

Spider Support Ring: This integrated ring increases the bonding surface area between the voice coil former and spider, establishing a stronger joint. The result is increased mechanical power handling under high power/high excursion situations.

Anodized Aluminum Voice Coil Former: Aluminum voice coil formers offer superior heat dissipation over other commonly used materials. The hard-anodized finish increases the former strength. These two factors combine to improve the overall power handling characteristics of the subwoofer.

Precision Stamped CRS Basket: Reinforced cold roll steel basket legs dampen unwanted resonance for better bass coupling.

Removable Magnet Cover: The cosmetic magnet cover can be removed when additional mounting clearance is required. With the magnet cover installed, the woofer has the following dimensions:

  • Magnet Diameter: 5.823"
  • Depth as top: 4.072"

Spring Posts: The heavy-duty spring posts will accept pin connectors and bare wire.

Concealing Ring: Once the subwoofer is mounted, the concealing ring can be installed to hide the mounting screws, giving the subwoofer a finished look.

Enclosure Compatibility

Recommended Sealed Box Volume: The sealed box sizes recommended by Rockford Fosgate range from 0.15 cu/ft to 0.35 cu/ft. Within this range, the ideal size recommended by Rockford Fosgate is 0.25 cu/ft, so this is the enclosure recommended by Crutchfield.

Recommended Vented Box Volume: The vented box sizes recommended by Rockford Fosgate range from 0.5 cu/ft to 0.75 cu/ft. Within this range, the ideal size recommended by Rockford Fosgate is 0.65 cu/ft, so this is the enclosure recommended by Crutchfield. One 2" diameter x 5.9" long port should be used with a 0.65 cu/ft enclosure.

Recommended Single Reflex Bandpass Volume: Rockford Fosgate's enclosure chart lists three compatible bandpass enclosures. The highlighted bandpass enclosure has a sealed chamber volume of 0.2 cu/ft, a vented chamber volume of 0.22 cu/ft and a single 3" diameter x 16.25" long port. The smallest recommended enclosure has a sealed chamber volume of 0.15 cu/ft, a vented chamber volume of 0.2 cu/ft and a single 3" diameter x 19" long port. The largest recommended enclosure has a sealed chamber volume of 0.3 cu/ft, a vented chamber volume of 0.3 cu/ft and a single 3" diameter x 15.75" long port.

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