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:
Rockford Fosgate P18S4 owner's manual
- 8" woofer
- 1 Concealing ring
- 4 Self-adhesive foam gasket sections
- Installation and Operation manual (English/French/Spanish/German/Italian)
- "Team RF" window sticker
Customer reviews for Rockford Fosgate P18S4
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More details on the Rockford Fosgate P18S4
Features & specs
Features and Specs | ||
---|---|---|
Size | 8 -inch | |
Impedance (Ohms) | --- | |
Cone Material | Molded polypropylene | |
Surround Material | Foam | |
Port diameter (inches) | 2 | |
Port length (inches) | 5.9 | |
Free-Air | No | |
Dual Voice Coil | No | |
Sensitivity |
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 | |
Frame Width | 8.771 | |
Frame Length | 8.771 | |
Vas (liters) | 16 | |
Fs (Hz) | 35 | |
Qts | 0.518 | |
Xmax (millimeters) | 7 | |
Parts Warranty | 1 Year | |
Labor Warranty | 1 Year | |
Box Requirements | ||
Ideal Sealed Box Volume (cubic feet) | 0.25 | |
Minimum Sealed Box Volume (cubic feet) | 0.15 | |
Maximum Sealed Box Volume (cubic feet) | 0.35 | |
Ideal Ported Box Volume (cubic feet) | 0.65 | |
Minimum Ported Box Volume (cubic feet) | 0.5 | |
Maximum Ported Box Volume (cubic feet) | 0.75 |
Product Research
Features
Enclosure Compatibility
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.
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Customer Q&A
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I bought these, not to install in my car, but to install in my bookshelf speakers. (dont know if a wise choice)But i was very impressed. I loved the sound and the hard bass feeling that they provided. Until my brother blew them. But for what they cost, they are the best subs i have ever owned.
Mitch from West Bend, WI