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GRS 12PR-8 12" Poly Cone Rubber Surround Woofer

Brand:| Model: 12PR-8
A GRS 12PR-8 12" 8 ohm polypropylene cone woofer is a good, economical way to repair older speaker systems or create new projects.
  • 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: 5.55 lbs.  
List Price$23.99
You Save23%
Your Price
Buy 4-up$14.76
Part # 292-422
Qty:  EA
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Product Details

GRS 12PR-8 12" Poly Cone Rubber Surround Woofer

A GRS 12PR-8 12" 8 ohm polypropylene cone woofer is a good, economical way to repair older speaker systems or create new projects.

Product Specifications
  • Nominal Diameter12"
  • Power Handling (RMS)100 Watts
  • Power Handling (max)140 Watts
  • Impedance8 ohms
  • Frequency Response30 to 3,000 Hz
  • Sensitivity84 dB 1W/1m
  • Voice Coil Diameter2"
Thiele-Small Parameters
  • Resonant Frequency (Fs)32 Hz
  • DC Resistance (Re)7.59 ohms
  • Voice Coil Inductance (Le)1.4 mH
  • Mechanical Q (Qms)4.13
  • Electromagnetic Q (Qes)1.82
  • Total Q (Qts)1.26
  • Compliance Equivalent Volume (Vas)3.36 ft.³
  • Maximum Linear Excursion (Xmax)3.5 mm
Materials of Construction
  • Cone MaterialPoly
  • Magnet MaterialFerrite
Mounting Information
  • Overall Outside Diameter12"
  • Baffle Cutout Diameter11.0625"
  • Depth4.6875"
  • # Mounting Holes8
Optimum Cabinet Size *
  • Sealed Volume2.72 ft.³
  • Sealed F334 Hz
  • Vented Volume31 ft.³
  • Vented F318 Hz
  • * Enclosure volume/F3s based on BassBox "optimum" calculations-
GRS 12PR-8 12" Poly Cone Rubber Surround Woofer
  • BrandGRS
  • Model12PR-8
  • Part Number292-422
  • UPC844632088544
  • Product CategoryWoofers
  • Unit of MeasureEA
  • Product Rating
    (26 Reviews)
  • Weight5.55 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 12PR-8 12" Poly Cone Rubber Surround Woofer
GRS 12PR-8 12" Poly Cone Rubber Surround Woofer is rated 4.3077 out of 5 by 26.
Rated 1 out of 5 by from very not efficient wooferI have this woofer about a 4 monththe bass is not getting any betterits totaly weak look elsewhere
Date published: 2014-04-01
Rated 5 out of 5 by from Awlsome speaker at an unbeatable price.They make perfect 2x12 extention cabs for guitar. As long as you give them at least the recommended air space in a closed, insulated cab they produce perfect highs, mids and lows.
Date published: 2014-03-11
Rated 5 out of 5 by from Outstanding for the priceI put two of these woofers in an 8 cubic foot ported cabinet tuned to 22 hz. Bass can be heard and felt down to 30 hz. The poly cone and rubber surround allow me to permanently keep it by the pool without having to worry about any water damage. For the price, this woofer's a steal. I'm definitely ordering another pair in the future for a friend.
Date published: 2014-03-04
Rated 5 out of 5 by from Not bad at allBought for a friend to repair a pair of old marantz speakers in which the foam surrounds rotted out, he told me after break in they sound better than new. Not a bad deal at all for a drop in 12 inch woofer
Date published: 2014-02-10
Rated 4 out of 5 by from Really looks nice havent heard yet !I havent put cabs. togeather yet. I am planning on 4 inline per cab. with 8 mid & 4 tweets in line arrays above. and use crown xls 1500 on these and carver m-400 on mids & highs with active & passive crossovers on Both . Will write better reveiw when project complete.
Date published: 2014-01-16
Rated 5 out of 5 by from great replacementMy amp speaker start to sound there was a buzz when crank a little louder, I replaced it with a 12 inch speaker from parts express and it solved the problem. The speaker looks like a quality item, good sounding.Good price, well packaged and fast delivery.
Date published: 2014-03-11

Product Q&A

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who own this product or have experience with it.
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GRS 12PR-8 12" Poly Cone Rubber Surround Woofer

What port tube size and length is suggested for 3.36 cubic ft enclosure?

Is this spekaer for sealed or ported encloser? and what would be length to trim my 2 1/2 port tube?
Asked by: Strader
I definitely would not go ported with this speaker. It would appear that ~3 cu ft is about optimum though the qtc doesn't really reflect that. Anything I tried with a port tended to make the low end very uneven. Keeping it sealed would appear to make the driver sound much smoother.I modeled it anywhere from 1.5 to 20 cu ft and my recommendation would be to go with 3 cu ft box.
Answered by: Musgofasa
Date published: 2013-12-21

as a replacement for Wharfedale 60 bass?

Would this work very good as replacement for the original 12.5in woofer in vintage Wharfedale 60 cabinet (Dimensions: 24 height - 14 wide - 13 depth), cab has front-facing port (approx 7.5in long, 2in diameter).I have same question about Dayton Audio DC300-8. My goal is affordable replacements, and I want rubber surrounds so that they will not deteriorate.I plan to pair whichever woofers I am advised to buy with Dayton Audio DC28F-8 tweeter. Optimally, I would prefer to reuse original crossover network, which uses a choke of unknown value and a 12uf cap (which I recently purchased from you). Original published specs show a crossover freq of 1500Hz.
Asked by: bosschops
I used these to replace woofers in some Pioneer towers from the 1990's, and they sound better than the originals. I think they're an excellent value.I think this would be a good fit for the cabinets you have.
Answered by: JoePanfil
Date published: 2013-12-21

How many connections are on these speakers? My old Sonic 4000 have four.

Would these be a good replacement for the woofers in my existing speakers?
Asked by: 1947 Stylemaster
This speaker has two (2) terminals, one positive and one negative. If your existing speakers are dual voice coil models, then this would not be a good replacement. You would want a dual voice coil speaker to replace them. Dual voice coil speakers have four terminals, where standard speakers have only two. Please contact us at 1-800-338-0531 option 2, or via email at for further discussion and/or clarification on this matter.
Answered by: RussR
Date published: 2013-05-31

I have two connections on my existing speakers but each...see below

connection has two wires connected to it. Two red and two black. will this speaker still work on that set-up?
Asked by: 1947 Stylemaster
Yes the two connecting is for wire placement only. If it is a dual voice coil it will have 4 wires connecting from the connector to the speaker woofer. Dual voice coil is the single speaker acts as two speakers in one. Example is a car sub woofer.
Answered by: waldens audio
Date published: 2011-10-24

will this sub work good in a sealed 1.4 cubic feet box?

how well will the sound quality be in a 1.44 cubic feet sealed box??
Asked by: lytro96
This volume will work although I cannot say what the sound quality will be like. This is a smaller than optimal volume which means a high Qtc. If you like punchy "chest hitting" type bass, this will provide it to an extent. I would not expect much below 40 Hz however.
Answered by: MattP
Date published: 2013-12-21

1.8 cubic feet??

I have a sealed speaker box that is 1.8 cubic feet and i wanted to know if this sub will sound good in this air space??
Asked by: lytro96
This woofer will work pretty well in that airspace as long as the enclosure is heavily filled with stuffing.
Answered by: MattP
Date published: 2014-01-16

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