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
You Save30%
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 (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume0.08 ft.³
  • Sealed F3107 Hz
  • Vented Volume1.26 ft.³
  • Vented F354 Hz
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
    (9 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

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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 4.1111 out of 5 by 9.
Rated 4 out of 5 by from perfect fitI bought 6 of these woofers to replace the old worn out woofers in my optimus pro-77 speakers. they fit perfectly without any modifications needed. great price too.
Date published: 2014-11-13
Rated 5 out of 5 by from Sounded pretty good!Bought 2 of these and 2 of the $0.99 tweeters1-2TW-SD85 with 4.7 mf capacitors for an old set of Jensen bookshelf speaker that were my Dad's. Although the cabinets were twice the size of the sealed box recommended size they still sounded pretty good.
Date published: 2014-06-17
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: 2014-03-20
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: 2014-01-16
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: 2013-07-25
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: 2012-10-05

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

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

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
Let's try to work on those questions... When using a stock crossover - it's best to design to its impedance. Don' worry about your amp. Most amps can handle 4 or 8 ohm loads without issue. When you design a speaker and mix impedances - you're better off custom building your crossover. This is easy to do with a crossover calculator. You plug in the impedance of the drivers, choose the type of crossover (6db/oct etc), the crossover point and it shows you a schematic and the part numbers... To keep it simple - use one woofer, or 4 in series/parallel per side which keeps the same impedance.
Answered by: MarkAJH
Date published: 2012-09-03

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

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
If the nom. impedance is the same as the original Infinity drivers were, these should work fine with the existing x-over. Final SQ will depend on your opinion, but these should be a good 1st try.
Answered by: C from Claypool
Date published: 2012-03-03


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

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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