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Manuals & Resources

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

Brand:|Model: 8PR-8|Part # 292-428
The GRS 8PR-8 8" woofer features a polypropylene cone and a rubber surround. It performs admirably in sealed-box speaker applications.
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Part # 292-428
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Highlights
  • 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

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
    (68 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.

View similar products to the GRS 8PR-8 8" Poly Cone Rubber Surround Woofer
in the Woofers product category.

Reviews

GRS 8PR-8 8" Poly Cone Rubber Surround Woofer
GRS 8PR-8 8" Poly Cone Rubber Surround Woofer is rated 4.6471 out of 5 by 68.
Rated 5 out of 5 by from Excellent Value!I bought a pair of these and for the longest time I haven't been able to use them in any projects until I picked up a pair of Energy ESM-3 speakers for free, original woofers had no foam left and one of the cones was completely useless. A bit of tinkering and some gasketing tape, I revived the original Vifa dome tweeters and added the new woofers and out came a near perfect match from the originals but more beefed up and rich bass response, highs are just wonderful and turned up to a high volume, woofers are barely warm and zero distortion, not bad for $12 woofers, get more for your money here!
Date published: 2015-11-15
Rated 5 out of 5 by from Good ReplacementFor under $10 you can't go wrong. They look good and the sound is good for the price.
Date published: 2015-11-04
Rated 5 out of 5 by from Excellent Replacement!Bought two of these to rebuild a pair of Acoustic Research AR4X's that I grabbed at a local e-recycling center. I had my doubts about these since they were only $10 each. I figured if they were junk, I only spent $20 and I'd get something more expensive. But I was pleasantly surprised. They sound GREAT! Very happy with my choice.
Date published: 2015-10-05
Rated 5 out of 5 by from replacementarrived fast, cheap upgrade to the original speakers
Date published: 2015-10-01
Rated 4 out of 5 by from Great replacement for Subaru McIntosh SubwooferPurchased this to replace a blown Mcintosh subwoofer in Subaru Legacy. Very hard to find something that isa) under 100RMSb) high sensitivityc) free aird) 8 ohmsThis GRS subwoofer lined up perfect with factory mounting holes, and while not quite as low or loud as the Mcintosh it does offer punch, and fills in slightly lower than than the front 6.5" speakers.Going above 32 on the volume control does over exert this subwoofer especially on very bassy and punchy music, but 32 is pretty loud on the Mcintosh headunit.Overall I am happy for the $60NZ inc shipping paid. I would never have found anything suitable at this price point for running in the Stock system.
Date published: 2015-08-23
Rated 5 out of 5 by from 3 Years And Still Going Strong!i bought 4 of these 3 years ago to restore some late 70's speaker towers and they haven't skipped a beat! and trust me i play my audio equipment to the limit! so a pair of these are in a box that's about 3 cubic feet and at full power they can it 40Hz before they exceed excursion limits, and with some EQ help they will have nice mid range as well. I have then running 2-way full range with a tweeter crossed at 3500Hz
Date published: 2015-07-24
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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 a 1.4 cu. ft. cabinet.

Asked by: JackZ
Sealed they will work very well. I would not recommend porting these in that volume.
Answered by: MattP
Date published: 2015-12-16

Will these work in a KEF Q90 speaker that has a blown woofer.  What is the outside diameter of the woofer basket?  Do these come in 4 ohm also.

Asked by: discotea30
We do not have a cross reference available for this type of thing. 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: 2015-12-08

Can you model this driver in the 300-7066 cabinet with the top section blocked off?  Should be around .87 cu ft.  I would like the impedance and freq curves.  Will using a coaxial mid/tweet limit horizontal dispersion?   

Asked by: 54_Chevy
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: 2015-10-14

What is the displacement of this driver? I have another project in mind after i finish the current one.

Asked by: FellCrustacean8
The displacement of this woofer is 0.03 cuft.
Answered by: MattP
Date published: 2015-08-31

I'm looking for a simple combination for these woofers. 2 way? 3 Way? Tweeter? Crossover? Midrange? I'm running a Sansui AU999 Amp. I just want low level clean sound that fills the room. Budget minded of course, what combination would you suggest? 

Asked by: Madison44
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: 2015-04-29

What is the magnet weight on the GRS 8PR-8 8" Poly Cone Rubber Surround Woofer???

Asked by: Shakey1
Magnet weight is not listed for this model unfortunately. I would say it is 20-25 oz.
Answered by: MattP
Date published: 2015-03-24
  • 2016-02-07T07:15CST
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