GRS 5PF-8 5-1/4" Paper Cone Foam Surround Woofer

Brand:| Model: 5PF-8
The GRS 5PF-8 5-1/4" woofers feature a poly-laminate coated cone and a foam surround. They are ideally suited for all sealed-box speaker applications.
  • 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 # 
Weight: 1.15 lbs.  
List Price$8.99
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Your Price
Buy 4-up$5.00
Part # 292-405
Qty:  EA
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Product Details

GRS 5PF-8 5-1/4" Paper Cone Foam Surround Woofer

The GRS 5PF-8 5-1/4" woofers feature a poly-laminate coated cone and a foam surround. They are ideally suited for all sealed-box speaker applications. Thanks to their carefully optimized parameters, GRS 5PF-8 5-1/4" 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 Diameter5-1/4"
  • Power Handling (RMS)70 Watts
  • Power Handling (max)130 Watts
  • Impedance8 ohms
  • Frequency Response90 to 8,000 Hz
  • Sensitivity84 dB 1W/1m
  • Voice Coil Diameter1"
Thiele-Small Parameters
  • Resonant Frequency (Fs)100 Hz
  • DC Resistance (Re)7.45 ohms
  • Voice Coil Inductance (Le)0.85 mH
  • Mechanical Q (Qms)4.87
  • Electromagnetic Q (Qes)1.97
  • Total Q (Qts)1.4
  • Compliance Equivalent Volume (Vas)0.11 ft.³
  • Maximum Linear Excursion (Xmax)2.5 mm
Materials of Construction
  • Cone MaterialTreated Paper
  • Surround MaterialFoam
  • Magnet MaterialFerrite
Mounting Information
  • Overall Outside Diameter5.0625"
  • Baffle Cutout Diameter4.75"
  • Depth2.3125"
  • # Mounting Holes4
Optimum Cabinet Size *
  • Sealed Volume0.08 ft.³
  • Sealed F3107 Hz
  • Vented Volume1.26 ft.³
  • Vented F354 Hz
  • * Enclosure volume/F3s based on BassBox "optimum" calculations-
GRS 5PF-8 5-1/4" Paper Cone Foam Surround Woofer
  • BrandGRS
  • Model5PF-8
  • Part Number292-405
  • UPC844632088452
  • Product CategoryWoofers
  • Unit of MeasureEA
  • Product Rating
    (7 Reviews)
  • Weight1.15 lbs.
  • California Prop 65

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

Similar Products

View similar products to the GRS 5PF-8 5-1/4" Paper Cone Foam Surround Woofer
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GRS 5PF-8 5-1/4" Paper Cone Foam Surround Woofer
GRS 5PF-8 5-1/4" Paper Cone Foam Surround Woofer is rated 4.0 out of 5 by 7.
Rated 4 out of 5 by from Solid performanceI bought six of these to replace the drivers in 3 pairs of Baby Advents to be used as a PC desktop theater. I have them hooked up to a Sherwood 6.1 100wpc receiver, with the PC Optical Digital output.  I'm pleased with the clarity and power handling, but as others have stated they're not as punchy on the low end.  With an added subwoofer though, my setup rocks.
Date published: 2014-03-21
Rated 2 out of 5 by from Advertised as 5.25" but not even close...It's tiny.  Ok, sure I should have checked the specs better, but I'd expect a 5.25" speaker to at least be 5.25" right?  This one is 4.75" from edge to edge of the speaker and even the box it ships in barely hits 5.25.  These are speakers, not monitors/TVs.  Oh well.  Glad I did not pay a lot for this but I may end up returning it anyway since it won;t be of any use to me.
Date published: 2014-02-26
Rated 5 out of 5 by from Sound better than originalI purchase this speakers so I can replace blown original speakers I installed them perfect size value and after installed the sound was so clear better than original. Thank you...
Date published: 2014-04-11
Rated 4 out of 5 by from Suprising good sound for the money...I had a challenge trying to find a replacement woofer for a pair of speakers. It needed to be underhung with 5 1/4 " diameter from hole to hole for mounting, square framed so it wound fit in the cabinet, and surround diameter no bigger that 4 3/8 in. So, reluctantly I boughts these since nothing else would work (they fit perfectly.) I had this thing called a port which was more of an air hole. I tried them, but after plugging that hole up, creating a sealed cabinet...They sound pretty Good!With a Hi-Vi 1 1/8 fabric dome tweeter, it sounds very balanced. And for the money, not bad... The only thing is these woofers have little bass response, so I had to turn the sub crossover all the way up to 150 hz. The woofer has a warm detailed sound in this situation...
Date published: 2014-03-21
Rated 4 out of 5 by from Clear sound lacking low endI bought four of these .A 2.5K Dayton crossover and two phenolic ring tweeters.I make enclosures of my own design and try to get a balanced sound. Often I can get more low end with the 5.25 drivers but this GRS has its limits. But the area it covers is perfectly clear audio.A bit forward no matter what I do. But with the phenolic ring tweeters it covers a large section of the audio range with good detail.I bought these GRS because they cost little with a plan to buy more expensive drivers to replace them later.But I was not unhappy that I ordered them after I got them running. If I build a subwoofer to add to this pair I will have good sound through the audio range.They seem to have good transient response and clear detail. They are well worth the price and got me going.I may put more expensive drivers in their place later but use them again.The pair will handle a lot of watts.I am happy I bought them.
Date published: 2014-04-11
Rated 4 out of 5 by from excellent driver for replacementreplaced original drivers in 2 pair of 1988 Mini Advents. These Advents were being used for surround speakers only. Would use them as main speakers for a small system with these drivers installed. Tested these 4 mini Advents on a Luxman L-100 using CD's and IPOD and the results super clean and sweet.
Date published: 2014-04-11

Product Q&A

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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 5PF-8 5-1/4" Paper Cone Foam Surround Woofer

If i put a 4 ohm resistor on 2 of these wired in parallel will the load be 4 ohms?

Asked by: BChristy15
If you wire two of these in parallel, the load will be approximately 4 ohms. As a general rule, you should avoid using resistors in woofer circuits.
Answered by: AlonzoTG
Date published: 2014-03-21

Impedence of woffer tweeter mix

I just ordered 4 of these woofers which are 8 ohms,I also ordered 2 phonolic ring tweeters which are 8 ohms.If i parallel 2 woofers then hook the 8 ohm tweeter on the factory Dayton 2.5 k crossover and set the plug for 4 ohms will that be OK? Any advice on how to connect these ? Or should I order 4 ohm woofers? My amp will drive 4 ohm loads.
Asked by: clod
Yes, that is the way to go. The two woofers in parallel will present an 4 ohm load on the woofer leg of the crossover, so the woofer impedance jumper should be set to 4 ohms.Also, with two in parallel, they should be pretty well level matched to the tweeter, so no lpad needed (in theory).Good luck! These won't be a knock-your-socks-off audiophile combination, but I imagine in the right box you may have yourself a nice mellow sounding set of speakers.Enjoy!
Answered by: Travis Rysdam
Date published: 2012-09-04


hey i was wondering if i had a 15w amp and used 1 speaker on each channel(2 channels total) would it be bad for the amp
Asked by: 110volts
No, this speaker would be perfectly fine on your 15w amplifier, one speaker per channel.
Answered by: RussR
Date published: 2014-03-21

replacement of blown speakers

i have 1 infinity sterling video center speaker that both of the 5.5" speakers have blown surrounds and maybe blown voice coils. i am looking for replacements would your p/n 292-405 work in it for replacement speakers?
Asked by: vintron
As you just mentioned that the old speakers are 5.5 size.I just put these GRS 5.25 in holes of 4.75 diameter.You would have air gaps trying to put them in holes larger than 4.75.Which is 4 and 3/4 inch. The rest of the question I can't answer.
Answered by: clod
Date published: 2012-10-18

What is the diagonal distance, i.e. across the cone, between the mounting holes?

Asked by: Bob J.
Te center to center distance diagonally between screw holes is 5-1/4".
Answered by: MattP
Date published: 2012-10-18

can i use the gfs 5pf with a vented cabinet -trying to make a cheap sub with old cabinet that hat bad driver-also would i need anyting else

Asked by: audiogeek1958
This driver, due to it's Fs of 100 Hz, would be best used as a midbass/midrange in a sealed enclosure. A vented enclosure wouldn't be recommended.See the linked woofer below for something that might meet your needs.
Answered by: mikevv
Date published: 2014-04-11

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