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.
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
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
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More details on the Rockford Fosgate P18S4
Features & specs
|Cone Material||Molded polypropylene|
|Ideal Sealed Box Volume (cubic feet)||0.25|
|Ideal Ported Box Volume (cubic feet)||0.65|
|Port diameter (inches)||2|
|Port length (inches)||5.9|
|Dual Voice Coil||No|
83 dB at 1 watt |
|Frequency Response||40 - 250 Hz|
|Max RMS Power Handling||150|
|Peak Power Handling (Watts)||300|
|Top Mount Depth (inches)||4 1/8|
|Bottom Mount Depth (inches)||N/A|
|Cutout Diameter or Length (inches)||7|
|Parts Warranty||1 Year|
|Labor Warranty||1 Year|
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.
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.