GRS 8PR-8 8" Poly Cone Rubber Surround Woofer

Brand:| Model: 8PR-8
The GRS 8PR-8 8" woofer features a polypropylene cone and a rubber surround. It performs admirably in sealed-box speaker applications.
  • Polypropylene cone for perfect balance of stiffness, mass, and self-damping
  • Butyl rubber surround ensures high excursion and long term durability
  • Stamped steel frame keeps components in perfect alignment
  • Optimized motor features high-energy ceramic ferrite magnet, vented pole piece
Part # 
Weight: 3 lbs.  
List Price$16.99
You Save29%
Your Price
Buy 4-up$9.64
Part # 292-428
Qty:  EA
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Product Details

GRS 8PR-8 8" Poly Cone Rubber Surround Woofer

The GRS 8PR-8 8" woofer features a polypropylene cone and a rubber surround. It performs admirably in sealed-box speaker applications. Thanks to its carefully optimized parameters, the GRS 8PR-8 8" polypropylene cone woofer with butyl rubber surround offers a high degree of compatibility when used as a replacement speaker—it also provide excellent performance in new projects, too.

Product Specifications
  • Nominal Diameter8"
  • Power Handling (RMS)65 Watts
  • Power Handling (max)90 Watts
  • Impedance8 ohms
  • Frequency Response40 to 5,000 Hz
  • Sensitivity85 dB 1W/1m
  • Voice Coil Diameter1.5"
Thiele-Small Parameters
  • Resonant Frequency (Fs)52 Hz
  • DC Resistance (Re)7.58 ohms
  • Voice Coil Inductance (Le)1.09 mH
  • Mechanical Q (Qms)4.77
  • Electromagnetic Q (Qes)1.45
  • Total Q (Qts)1.11
  • Compliance Equivalent Volume (Vas)0.76 ft.³
  • Maximum Linear Excursion (Xmax)3 mm
Materials of Construction
  • Cone MaterialPoly
  • Surround MaterialRubber
  • Magnet MaterialFerrite
Mounting Information
  • Overall Outside Diameter8"
  • Baffle Cutout Diameter7.32"
  • Depth3.44"
  • # Mounting Holes4
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume0.81 ft.³
  • Sealed F354 Hz
  • Vented Volume5.54 ft.³
  • Vented F329 Hz
GRS 8PR-8 8" Poly Cone Rubber Surround Woofer
  • BrandGRS
  • Model8PR-8
  • Part Number292-428
  • UPC844632088520
  • Product CategoryWoofers
  • Unit of MeasureEA
  • Product Rating
    (56 Reviews)
  • Weight3 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.

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GRS 8PR-8 8" Poly Cone Rubber Surround Woofer
GRS 8PR-8 8" Poly Cone Rubber Surround Woofer is rated 4.6607 out of 5 by 56.
Rated 5 out of 5 by from Great sound.Speakers arrived promptly via USPS in fine condition cause they were well packed for shipment. Installing in the old KHL enclosures was a challenge since the diameter of the GRS 8's was about 1/4" less than the cutout. It required some careful drilling for new screw holes and I just took my time being certain to double-check centering. Another problem was that there was just a single wire lug on positive and negative side verses two on the old speakers so that required soldering the wires to the lugs instead of using quick connectors. Again, careful work produced good results and they are now up and running and sound fine.
Date published: 2014-11-13
Rated 5 out of 5 by from Very Good ValueThese are very good speakers. I don't think you could do better for a small sealed cabinet at twice the price
Date published: 2014-10-05
Rated 4 out of 5 by from Best Bang for teh Buck 8 Incher!Works best in sealed cabinets but also a great cost effective solution for Bose 301s if you seal off the Bose port (easily done!). Sturdy poly cone and long lasting rubber seal are nice features for a long lasting driver! Not the lowest bass but for the money hard to beat!
Date published: 2014-08-25
Rated 5 out of 5 by from Excellent performance, for the price.I have a pair of B652's, but wanted some more bass. After a little reseach on the PE website, I decided a pair of two way tower speakers with a 8" woofer might do the trick. Looking at price & reviews, I settled on the 8PR-8 for the woofer, and the Goldwood GT-25 for the tweeter. Throw in a PE 260-174 3000 Hz crossover, and a 36"X10"X10" cabinet, and I have what I wanted. I know it's apples & oranges, but these speakers perform way better than the B652's. They aren't audiophile material, but the sound is just what I like, without breaking the bank.
Date published: 2014-07-20
Rated 5 out of 5 by from Good Price - GoodSoundMy old Radio Shack woofers dried out and this was an easy and quick fix. Cost effective too.
Date published: 2014-06-18
Rated 5 out of 5 by from great for pricegreat sound for price bought 4 of these to repair blown woofers
Date published: 2014-04-01

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 8PR-8 8" Poly Cone Rubber Surround Woofer

How would these work in an Acoustic Research AR-18b?  (.34 cubic feet, sealed, 2000 hz crossover 88db sensitivity.)  Would the paper GRS 8PF-8 be better?  Or some other 8" woofer?

Asked by: Bigtrain
Either option will work well in that speaker. The rubber surround on this model will last much longer than the foam of the other however.
Answered by: MattP
Date published: 2014-10-17

i have to replace a speaker i damaged how do  i measure/ dimension  the size i.e.  6" 7 " the rest of the spec is on the speaker 

Asked by: shore1
Please contact our tech support for more help with this question, tech@parts-express.com or 800-338-0531 x1.
Answered by: MattP
Date published: 2014-09-12

How does this unit preform when ported?

Asked by: Martie
With the very high Qts this will have a large bump around F3 which can be undesirable. It will act as a natural bass boost, so if you like the bass turned up or loudness button pressed you may like how it sounds.
Answered by: MattP
Date published: 2014-08-25

Would this woofer be a good replacement for a pioneer model CS 44 ?

Asked by: gm gm gm
This might be a good option. The main thing to check would be the actual driver dimensions. There is some variation on speaker frames so the outside diameter and cutout is important
Answered by: Chrisf
Date published: 2014-06-06

Port size for 12x16x12 box tuned for 50hz

I will be making some 2-way home theator speakers, I would like to tune the 12x16x12 boxes for around 50Hz. Also, Would a pvc pipe work for a port? I have used them in the past with DIY speakers, and have had no trouble, thanks!
Asked by: Speakerfreaker
A 2" diameter, 2" long port is required to tune those enclosures to 50 Hz. Yes PVC pipe will work perfectly as port tubes.
Answered by: MattP
Date published: 2013-10-02

Will these work well as replacements for dual 8's in a 1.5 cu.ft box?

I have a vintage Jennings Research cabinet that uses 2-8"ers in a sealed box. Crossed over at 2500hz and 500hz respectively.I see from the specs that PE recommends smaller box and since there's 2 drivers can essentially double the box size? Which would be about 1.6 cuft. But, Qts looks like they should want bigger box?
Asked by: cmfast
These will work fine for that application. The box size we have listed is a high Q alignment because the optimally flat volume is quite large.
Answered by: MattP
Date published: 2013-06-27

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