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

Brand:| Model: 8PR-8
Overview
The GRS 8PR-8 8" woofer features a polypropylene cone and a rubber surround. It performs admirably in sealed-box speaker applications.
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
Part # 
292-428
Weight: 3 lbs.  
IN STOCK
List Price$16.99
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$12.00
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Part # 292-428
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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
    (58 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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Reviews

GRS 8PR-8 8" Poly Cone Rubber Surround Woofer
GRS 8PR-8 8" Poly Cone Rubber Surround Woofer is rated 4.6552 out of 5 by 58.
Rated 5 out of 5 by from Great fit for an old 1960s Truetone consoleI used these speakers to replace the decayed old paper speakers in a 1960s Truetone console stereo. They fit perfectly without having to drill new mounting holes! I was very impressed. Sound is good for my needs (AM/FM/Phono). Would definitely recommend.
Date published: 2014-12-01
Rated 4 out of 5 by from GRS- 8PR-8These 8 inch speakers are perfect for replacing our worn out pa system speakers, the price is good & delivery was quick.
Date published: 2014-11-28
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

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 will this woofer perform in a .6 cu ft box ?

Asked by: madmuh
It will perform well in a sealed .6 cu ft. enclosure with a F3 of 58.2 Hz.
Answered by: RobTaylor
Date published: 2014-12-05

What si the ebst box size for four of these woofers in a single box? According to the specs a ported enclosure recommends around 5.5 cubic feet and that's pretty huge.I was thinking more around 3-4 cubic feet @ 40Hz.

Asked by: Kilobytez95
The parameters of this woofer call for a very large ported box. If you put it in a smaller box you will have a very large peak in the bass response which can cause a boomy sound, as well as severely limit the bottom end below the peak. These will really work best in a sealed enclosure providing a smoother response and more extension capability. 3-4 cubic feet for four woofers sealed would be ideal and will reach ~40 Hz without a problem.
Answered by: MattP
Date published: 2014-12-04

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

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