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GRS 4PF-8 4" Paper Cone Foam Surround Woofer

Brand:| Model: 4PF-8
Overview
Thanks to their carefully optimized parameters, GRS 4PF-8 4" poly-laminated paper cone woofers offer a high degree of compatibility when used as replacement speakers.
Highlights
  • Perfect for use in sealed-box home theater and music systems
  • Poly-laminated paper cone, treated foam surround, and polymer dust cap
  • Smooth frequency response with minimal cone breakup
Part # 
292-404
Weight: 1.4 lbs.  
IN STOCK
List Price$7.99
You Save34%
Your Price
$5.25
Buy 4-up$4.40
Part # 292-404
Qty:  EA
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Product Details

GRS 4PF-8 4" Paper Cone Foam Surround Woofer

Thanks to their carefully optimized parameters, GRS 4PF-8 4" poly-laminated paper cone woofers offer a high degree of compatibility when used as replacement speakers—they also provide excellent performance in new projects, too.



Product Specifications
  • Nominal Diameter4"
  • Power Handling (RMS)40 Watts
  • Power Handling (max)70 Watts
  • Impedance8 ohms
  • Frequency Response100 to 10,000 Hz
  • Sensitivity84 dB 1W/1m
  • Voice Coil Diameter1"
Thiele-Small Parameters
  • Resonant Frequency (Fs)98 Hz
  • DC Resistance (Re)7.49 ohms
  • Voice Coil Inductance (Le)0.88 mH
  • Mechanical Q (Qms)4.55
  • Electromagnetic Q (Qes)1.9
  • Total Q (Qts)1.34
  • Compliance Equivalent Volume (Vas)0.12 ft.³
  • Maximum Linear Excursion (Xmax)2.5 mm
Materials of Construction
  • Cone MaterialTreated Paper
  • Magnet MaterialFerrite
Mounting Information
  • Overall Outside Diameter4.125"
  • Baffle Cutout Diameter3.75"
  • Depth2.125"
  • # Mounting Holes4
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume0.09 ft.³
  • Sealed F3104 Hz
  • Vented Volume1.26 ft.³
  • Vented F353 Hz
GRS 4PF-8 4" Paper Cone Foam Surround Woofer
  • BrandGRS
  • Model4PF-8
  • Part Number292-404
  • UPC844632088445
  • Product CategoryWoofers
  • Unit of MeasureEA
  • Product Rating
    (14 Reviews)
  • Weight1.4 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

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Reviews

GRS 4PF-8 4" Paper Cone Foam Surround Woofer
GRS 4PF-8 4" Paper Cone Foam Surround Woofer is rated 4.0714 out of 5 by 14.
Rated 1 out of 5 by from size does match advertised spec.Cutout size for this speaker is 3 3/4" and not the specified 4" in ad.
Date published: 2014-09-30
Rated 5 out of 5 by from Good option for Optimus 50 midrange replacementMy old Optimum-50 midrange speakers blew, well not blew, deteriorated, so I searched for replacements. These seemed to fit the bill - not exact spec replacements, but close enough. They almost fit in the cabinets, but with a little Dremel tool work I was able to bevel the opening and bezel for a nice fit. They sound good to me, and that's all that matters.
Date published: 2014-09-26
Rated 5 out of 5 by from Great soundsi bought these for the A-pillars in my car, i have 3 per pillar and they are loud and clear off my head unit. i havent amped them yet but off the head unit they get a little too low so they dont distort but they arent as sharp on certain rap songs but for 4.40 a piece, they sound amazing and i love them. will most likely buy more
Date published: 2014-09-03
Rated 4 out of 5 by from good little for the moneyI purchased a pair of these to use in some outdoor speakers and I am very happy with the results. They won't shake the earth, however for nice background music they do the trick, and the price can't be beat.
Date published: 2014-06-29
Rated 5 out of 5 by from Decent ReplacementI bought a pair to replace the woofers in an old pair of Realistic Minimus Sevens. They do not have as much base as the originals. However, they do sound good.
Date published: 2014-04-22
Rated 4 out of 5 by from Nice little woofer.I strive to to capture every sound on a recording. I want to here the stick hit the drum and the finger sliding on the string. That being said I used this driver in a 5-way speaker as a mid woofer and it worked really well. It seems to work better in a ported cabinet better than a sealed cabinet.
Date published: 2014-03-31

Product Q&A

Get your questions answered from other customers
who own this product or have experience with it.
If your question requires design or troubleshooting information,
please email tech@parts-expresss.com  for a prompt reply.
GRS 4PF-8 4" Paper Cone Foam Surround Woofer

My cabinet has a cut out of 4.25 will this fit or should I go with the 5 inch woofer?

Asked by: chitae
This woofer will be too small and the 5" would be too large. You would be better off enlarging the hole to fit the 5" since that is easier to do.
Answered by: MattP
Date published: 2014-03-31

I recently used these in a school project are there any replacements that have more bass? or go lower in frequency?

Asked by: JC123
This depends on how low these are playing. With a 4" driver you can't expect much below 70-80 Hz in a small cabinet. We do offer a few 4" models that will play into the upper 50's in a larger enclosure but they are in the $25-$30 price range.
Answered by: MattP
Date published: 2014-04-24

mounting in micro guitar amp

I have a 5 watt @8 ohm peavy amp .I was hoping to upgrade the speaker Do u think this would improve the sound? this speaker looks beefier than the one in the cabinet and better quality..could u send me mounting diagram or give me the dimension for hole center to center for the mounting screws thanks Toml
Asked by: td7849
This will work well for an application like this although we cannot say whether you will see an improvement in sound or not. The holes are on a 4-1/8" circle.
Answered by: MattP
Date published: 2013-01-15

Help with calculating ported or sealed enclosure?

I'm attempting to build a cheap... ahem... inexpensive tv soundbar using these woofers. EBP is showing 51.58 which indicates this speaker is good for both ported or sealed enclosures, although it looks like it favors sealed. I've tried online speaker box calculators, but they show at least 6+ cubic feet (EACH - left and right channel) Vb for either designs. That seems just too big for a soundbar.I'm using a 50W x 2 to drive these (and their corresponding PE Buyout tweeter) so I'd like (if feasible) to lean toward a ported design so that I don't have to use all that power for lower volumes. But if a sealed design is the best way to go, well then I go with that. Any suggestions, experiences, or recommendations for a MUCH smaller design would be well appreciated. Thanks in advance!
Asked by: BMan63
Hi Pal,,,lol, funny stuff,, Dual 18" concert subs don't even use 6 cubic ft.Make sure you place those decibel points correctly and type in all numbers exactly!!!0.1 cubic ft. per driver is what i am showing,The internal cabinet volume measurements would be:H 6.00" x W 6.00" x D 6.00",,, 12" x 6" x 6" is 0.25 cubic ft and good for two drivers (with a tad extra space that cant hurt).Cut-off says 39hz, I feel its closer to 50hz !!!!..Be sure to line top back and side with dampening material found here at PE,,,, fiberglass insulation works in a pinch, but you'll itch a bit....Best of luckPS: Keep it sealed, use silicone on all internal seams (leaking air will compromises bass performance)
Answered by: salvatore J
Date published: 2013-01-05

Recommended crossover frequency?

For a 1st order butterworth crossover, paired with the given tweeter, what would a good frequency be/what inductors and capacitors should I get?
Asked by: iamrcubed
The Butterworth slope is not feasible in a 1st order (6db/octave) network. it starts in the 12db/octave,Second order and up.See attached crossover drawing and assuming parts are all 8 ohms...round values to the nearest,,,, good luck
Answered by: salvatore J
Date published: 2012-12-13

Low pass filter needed?

Do I need a low pass filter for these if using them in a line array with Piezo tweeters?
Asked by: LynxTWO
You should use a 1.6 mh coil to filter these, at least that's what I did. Sounds good.
Answered by: Bigblaine
Date published: 2013-04-13

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