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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
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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 *
  • Sealed Volume0.81 ft.³
  • Sealed F354 Hz
  • Vented Volume5.54 ft.³
  • Vented F329 Hz
  • * Enclosure volume/F3s based on BassBox "optimum" calculations-
GRS 8PR-8 8" Poly Cone Rubber Surround Woofer
  • BrandGRS
  • Model8PR-8
  • Part Number292-428
  • UPC844632088520
  • Product CategoryWoofers
  • Unit of MeasureEA
  • Product Rating
    (51 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 4.6471 out of 5 by 51.
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
Rated 5 out of 5 by from Excellent value!I purchased 4 8" woofers for 2 sets of speakers. Work perfect and super nice sound quality. An excellent upgrade for older speakers.
Date published: 2014-02-27
Rated 5 out of 5 by from huge bang for the the buck !!!I bought these woofers to replace blown up woofers from rotten surrounds in Tannoy PBM-8. They were a perfect replacement and they seem to be great quality. They sound just like the original woofers. Parts express is my new go to for this kind of product.
Date published: 2014-02-10
Rated 4 out of 5 by from Took a chance because a the price. Glad I did.This was a replacement for deteriorated 8" Advent speakers. They sound great in the cabinets with the original crossovers. I got them for their price and really didn't expect much from them but they do sound better than the originals. I should tell you that my speakers were sealed with adhesive and were a bit of a pain to remove. I used the 260-400 speaker sealing caulk to close them up. I'm gonna use them to make a small sealed box for my old Tercel and maybe use some GRS 4FR8s in it too. Gotta love cheap great sounding speakers!
Date published: 2014-02-26
Rated 5 out of 5 by from Great replacement wooferThese have to be the "go to" replacement woofer for small to midsize sealed box replacements. Almost worth a trip to the thrift store to look for that long lost pair of vintage Scott or Advent speakers looking for some new life.
Date published: 2014-01-28
Rated 4 out of 5 by from Great Value 8-incher!Have used this driver in many re-driver jobs as well as new builds, always with great results. Crisp, strong bass sounds, full of energy with smooth lows all the way up to where I usually cross these over at 3kHz. Easy, direct swap out on most Infinity speaker boxes with many other users reporting similar easy drop-in replacement. A step above the 6.5" size of course, making it hard to listen to smaller drivers again! Whether ported or sealed as long as properly sized it is hard to miss with these drivers worth every penny!
Date published: 2014-01-26

Product Q&A

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

2 way setup

How would this woofer matchup with a Dayton Audio DC28F-8 crossed over at 2khz?
Asked by: tdees98
This could depend heavily on how you build your crossover. The woofers will work well at this point and could handle going a little higher with no trouble. The tweeter will need some serious slope if going at 2K though. I would suggest a minimum of 18db at 2k, I would actually suggest going to 3k and using a 12db slope. Very different opinions on crossovers exist. There are a lot of projects with these tweeters you could use as a reference too.The drivers will work well together and I suspect a pretty good sounding system from this configuration. You might want to hit up the forums and see if one of the crossover gurus there could help with a solid design that will make the best use of the drivers.
Answered by: Musgofasa
Date published: 2011-12-13

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

would this be a good speaker when paired with Dayton Audio DC28F-8 1-1/8" Silk Dome and crosed at 2k for mtm also want to run 4 drivers in mains

Asked by: prest
mis match this tweeter will outrun this type of woofer in 8 in the 6.5 or 7 might talk into the mid-range . spend the extra few $ on a slightly better woofers and check the discount on quantity /clearance like the auri 6 or 8 then you gotta matched ,bang for buck combo, don't let the small neo magnet scare you LOOK AT THE SPECS
Answered by: digitalhaven 53
Date published: 2011-12-13


I was going to pull the trigger on 4 of these 2day for a rebuild project, a pair of advent heritage towers. Another user has done the same but I notice that the towers are 6ohm not 8. is this going to cause any issues? is it the crossover that is 6ohms or is it the speakers? I can switch the ohms on my receiver so I'm good there.I have included a pic of the crossover if that helps out the folks that are smarter than I.
Asked by: in the doghouse
Yes, the speaker's impedance will have s slight effect on your Advent crossover. All passive crossovers are designed for many desired factors. It is much too complicated to fully discuss in this forum.Understanding that speaker imp values change slightly with frequency. Your Advents have a 12db slope, because of thisThe effect will be minimal to most listeners. A speaker test will show the difference clearly if you have a test of an origial "good" speaker for comparison.You can design a Zobel Network to compensate for the 2 ohm difference but you will need you crossover data to do this. Google Zobel Network and review what is needed.Every speaker system has frequencies where they operate more efficiently so at certain frequencies the speaker will play at a slightly different volume. Using this replacement speaker will likely change that resonant point thus changing the original sound characteristic. My oppinion is that the room acoustic properties can make more difference than this, so why worry. The Advents will still sound good but if you get an odd peak then add an equalizer and tame it down.Good luck.
Answered by: Nitnub
Date published: 2014-03-11

Can I use this 2 woofer in ported box With a plate amplifier ? What box spec?

Planning to use these 2 woofers with 70 sa dayton amp in 4 ohm load parallel wiring pushing with the low level input. There also 4 2 ohm 5 inch bazooka mid bass speaker wired in series to get 8 ohms and 2 2inch 4 ohm tweeters wired in series to get 8 ohms running off the high level input of the plate amplifier that receiving power from my Yamaha htr 3063 at 8 ohm load at 100 watt. . What be the best box recommended and size cu ft of each speaker. Planning to put these into one tower? Any suggestions?
Asked by: RichieRich93
I would not suggest putting these in a ported enclosure. They do not model very well in most airspace settings or with various tuning frequencies. They are fairly flexible in a sealed box. My suggestion is 1.4 cu ft sealed for both or .72 for each one.
Answered by: Musgofasa
Date published: 2012-07-09

Would these GRS 8PR-8 speakers be a good replacement for Bose 301 Series II cabinets?

The 8" woofers in my Bose 301 Series II cabinets are shot. Would these GRS 8PR-8 speakers be a good replacement? They are ported & previous answers state that these need to be used in a sealed enclosure. If they shouldn't be used, could someone recommend one that would be better suited? Thanks! Tom
Asked by: Cobrajet
This can be used in that cabinet with no real problems. The high Qts makes for a typical sealed alignment but running the numbers for a vented alignments around the size of a 301, it doesnt look too bad. The group delay gets a bit high in the low bass, but in reality the tuning of the cabinet prevents this range from even being used.
Answered by: Chrisf
Date published: 2012-11-27

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