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Rockford Fosgate P2D4-8

Punch P2 8" subwoofer with dual 4-ohm voice coils

Item # 5751P2D48

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$94.99 each

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About the Rockford Fosgate P2D4-8

Standout performance

Rockford Fosgate showcases their fanatical commitment to sonic excellence in the Punch Series of speakers, amps, and subs. If you like to listen to potent, powerful music — and feel it too — Punch components will give you impressive sound that'll stand out in a crowd.

Cutaway view

Bulletproof bass

Engineers at Rockford Fosgate designed the P2D4-8 8" subwoofer to dish out the kind of powerful low end you crave in your ride. Its responsive paper cone is reinforced with the same Kevlar® fibers used in bulletproof vests so you get the best of both worlds — warm bass that's exceptionally hard-hitting. Rockford Fosgate uses a new technique to attach the oversized rubber surround to the cone that increases available cone area up to 25%, so this sub can push more air for even bigger bass.

Made for heavy excursion

This P2 sub features an extended pole piece and bumped backplate that leaves more room for heavy excursion, so it'll hit deeper lows without "bottoming out." Special venting keeps the copper-clad aluminum voice coils cool through heavy use for consistent bass performance over time.

The dual 4-ohm voice coils allow you to wire the sub for 2-ohm impedance to work with a mono sub amp, or for 8-ohm impedance if you're using multiple subs. The P2D4-8 sub works equally well in a sealed or ported enclosure, so you can choose the kind of bass you want for your system.

To drive this single subwoofer, we recommend a mono amplifier rated between 200 and 375 watts RMS at 2 ohms. For more information, please refer to our article on How to Match Subwoofers and Amplifiers.

Product highlights:

  • 8" subwoofer with dual 4-ohm voice coils
  • Kevlar® reinforced paper cone
  • Santoprene surround
  • hybrid StampCast basket provides strength while minimizing weight and resonance
  • power range: 75-250 watts RMS (500 watts peak power)
  • frequency response: 39-250 Hz
  • sensitivity: 83.3 dB
  • top-mount depth: 4-13/16"
  • sealed box volume: 0.2-0.3 cubic feet
  • ported box volume: 0.65 cubic feet
  • grille not included
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # P2D4-8

What's in the box:

  • One 8" Dual 4-ohm voice coil subwoofer
  • Trim ring
  • Eight 1-1/8" Allen head screws
  • 4mm Allen head bit
  • Installation/Operation manual (English/ French/ Spanish/ German)

Customer reviews

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Rockford Fosgate P2D4-8 Reviews

Average Customer Review(s):

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Crutchfield response

More details on the Rockford Fosgate P2D4-8

Product Research

Enclosure Compatibility


Overview: The Rockford Fosgate Punch P2D4-8 is an 8-inch subwoofer with dual 4Ω voice coils. The sub features a StampCast steel frame, quick-release compression terminals, a Kevlar fiber reinforced paper cone, and Santoprene surround. An anodized aluminum voice coil former and spider venting help keep the subwoofer cool.

Dual 4Ω Voice Coils: The dual 4Ω voice coils offer wiring flexibility; when wired in parallel the woofer presents a 2Ω load, when wired in series the woofer presents an 8Ω load.

Steel Basket: The P2D4-8 subwoofer features a StampCast steel basket for added rigidity.

Compression Terminals: The P2D4-8 features spring post terminals which accommodate speaker wire up to 10 gauge.

CEA-2031 Compliant: Power handling on the P2D4-8 subwoofer conforms to CEA-2031 industry standards. This means the subwoofer has the capacity to handle its rated power under continuous demand, not instantaneous power handling, that over time, can damage voice coils.

FlexFit Basket: The Flex Fit frame utilizes slots (where possible) instead of single screw sized holes; allowing slight adjustment of the speaker when mounted.

Trim Ring: To improve the cosmetic look, a decorative trim ring is included that mounts over the flange of the woofer. When using the cast aluminum trim ring the woofer is first mounted with four screws, then the ring is placed on top of the woofer, aligning the final four holes of the woofer with ring. The other four screws are used for these holes to mount the ring and woofer to the enclosure. Without the trim ring the mounting height of the woofer is approximately 7/8 of an inch.

Enclosure Compatibility

Sealed Box: Rockford recommends a sealed enclosure with an optimum internal volume of 0.23 cubic feet (from 0.2 to 0.3 cubic feet is acceptable). Sealed enclosures provide the most control over a woofer, will handle a lot of power, and provide accurate sonic reproduction, making them suitable to all types of music.

Ported Box: Rockford recommends a ported enclosure with an internal volume of 0.65 cubic feet using one 2" diameter x 8" long port; this yields a tuning frequency of 38.5 Hz. Ported (or vented) enclosures typically provide better overall efficiency than sealed so they are suitable for use with smaller amplifiers, giving you more bass output from less power. However, this efficiency comes at the expense of very low frequency output (below 33 Hz).

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Customer Q&A

Crutchfield asked: Why did you buy this?
I have 4 12's and 6 mid range speakers, but am missing in the 100-300hz range. Hoping 2 of these will help fill the gap in a smaller sealed box [ Eric  Feb 17, 2019 ]
Brand I can trust and price was good. [ MATTHEW  Feb 08, 2019 ]
Needed a replacement sub [ Matthew  Mar 02, 2018 ]
6.5 job adio woofer locked up. Decided to replace with an 8" sub. Have had punch before. [ J. Scott  Oct 27, 2016 ]
I chose this sub because of the limited space that I have to work with, and also because it's a Rockford Fosgate. A solid brand that has never given me problems in my other vehicle. [ Tech head  Jul 09, 2016 ]
Car has a factory 8 inch sub in the head board behind the back head rests, just a upgrade ;) [ Charles  May 04, 2016 ]
My old speakers were Rockford Fosgate P28S8 .. purchased from you .. so .. went back to you for these [ Edward  Apr 24, 2016 ]
Because I have a stock Rockford Fosgate system already. [ Sherri  Jan 22, 2016 ]
I haven't used RF subs before, but their amps are awesome. These were on sale so I figured I would try them. My son's Suburban has one 12" sub in the rear, which has difficulty reaching the front seats through two other rows of seats, especially when there are people in them, so I am going to build a custom console to replace the factory and fit these 8s in it. Their sealed enclosure volume is small, so I think I can fit them. [ DanenG  Jan 16, 2016 ]
my amp can stay ice cold just running at 2 ohms stereo , or if I only want to use just one sub , my amp is only stable at 4 ohms mono so I can wire in series [ GARY  Jan 08, 2016 ]

6 questions already asked

Do I have to put this in a box?
[ Oskar  Apr 10, 2018 ]
4 answers
I would suggest an enclosure unless you have a stock sub that you can replace with this one.
[ Vincent  Apr 11, 2018 ]
Honestly it would sound alot better if you put it in a box with a good amp. I have a 2013 Kia soul and it had an 8' but I never really put it in right and then went with 2 12s.
[ CJ  Apr 11, 2018 ]
Not if you are mounting it in the rear dashboard of your car.
[ Chris  Apr 11, 2018 ]
Yes it does
[ Matthew  Apr 11, 2018 ]
is a Fosgate 500 1channel amp too powerful for P2D4-8?
[ Robert  Nov 17, 2017 ]
1 answer
To properly power the Rockford P2D4-8 subwoofer, we recommend a mono amplifier rated between 200 and 375 watts RMS at 2-ohms. For further help finding an appropriate amplifier for this sub model, please contact an Advisor directly by phone (888.955.6000) or online chat. Thanks!
[ Larry  Nov 20, 2017 ]  Staff
is a Fosgate 500 1channel amp too powerful for this speaker?
[ Robert  Nov 17, 2017 ]
1 answer
It depends on the which model Rockford Fosgate 500 1 channel amp you are referring to. What you will want to look for is how many watts the amp is RMS and at how many ohms before you can tell weather or not it is compatible with this speaker. Respond with the amplifier model and I'll be able to give you a definitive answer.
[ Chris  Nov 18, 2017 ]
I want to hook up 4 rocksford p2 8 do i need 2 ohm or 4 ohm?
[ Isai  Jul 16, 2017 ]
3 answers
All depends on how you wore them but Crutchfield has wiring diagrams that will show you what ohm it runs for two of any speaker. Typically on a class D amp or single channel, it will be 2 ohm stable so two 4 ohm subs wired in parallel make a 2 ohm load. If the amp is 1 ohm stable you can do the same with 2 2 ohm subs to make 1 ohm.
[ Luke  Jul 20, 2017 ]
id go with the 4 ohm
[ Brandon  Jul 17, 2017 ]
Depends on what ohm load your amp can handle
[ Johnny  Jul 17, 2017 ]
can this speaker fit my 2006 Acura Tl?
[ Willem  Jul 01, 2016 ]
1 answer
You can check to see if this will fit your vehicle by using our Outfit My Car tool: For additional details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle.
[ Krissy  Jul 01, 2016 ]  Staff
How to connect wires from amp to speaker ?
[ Rodney  Jan 21, 2015 ]
1 answer
We look that depends on a few things. How many speakers, what size amp, etc. You need to know how to wire for a certain ohm load. Since this is a 4 ohm speaker. Then you'll want to keep the ohms wired to 4. Easiest thing to do bud is call Crutchfield and they can give you the step by step for your specific equipment. That's what I did to be certain and the customer service was beyond fantastic. Also, Rock ford's website has links for diagrams of how to wire for certain ohm loads.
[ JOSHUA C  Jan 22, 2015 ]

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