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$24.99
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Your Price
Buy 4-up$15.76
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 (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume2.72 ft.³
  • Sealed F334 Hz
  • Vented Volume31 ft.³
  • Vented F318 Hz
GRS 12PR-8 12" Poly Cone Rubber Surround Woofer
  • BrandGRS
  • Model12PR-8
  • Part Number292-422
  • UPC844632088544
  • Product CategoryWoofers
  • Unit of MeasureEA
  • Product Rating
    (29 Reviews)
  • Weight5.55 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product contains 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 4.3448 out of 5 by 29.
Rated 4 out of 5 by from speakersExcellent speakers for the price. Sounds great in my old Boston Acoustic cabinets.
Date published: 2014-06-18
Rated 5 out of 5 by from New SpeakersBought these speakers for my old expired Marantz ones that died and based upon the reviews of others. I got them and the packaging was great, dropped them in after a little widening of the mountig in the cabnets. Fired them up and for the money the speakers sound great, much better than the old one and these puppies can handle more than the factory speakers. Will buy again from Parts Express for all my audio needs
Date published: 2014-06-15
Rated 5 out of 5 by from Very good speaker!I bought this to replace a busted woofer in a MTV bass unit. It now sounds better than new.
Date published: 2014-06-12
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: 2014-03-31
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: 2014-03-05
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: 2014-03-02

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 12PR-8 12" Poly Cone Rubber Surround Woofer

What will by optimum cabinet size for vented box and port size. Thank You.

Asked by: Sladja9
The recommended ported volume for this woofer is 31 cubic feet, not very practical. We recommend around 2 cubic feet sealed for the best results.
Answered by: MattP
Date published: 2014-07-24

I wanna use these as subs in a sealed box.  Would 2 of these sound good bridged at 4 ohms on a pioneer gma-3602 2 channel amp? It puts 180 rms bridged 

Asked by: jimm5555
These will work well as sealed subwoofers but will be limited with their output capability do to their low excursion. If you are not looking for absolute SPL these should work fine.
Answered by: MattP
Date published: 2014-07-11

What is the magnet weight? Do you recommend this woofer to be used on my Yamaha R-S500 receiver? I think it is 85 watts RMS per channel.

Asked by: Ernesto
Unfortunately GRS does not supply the magnet weight. This woofer will work well with that kind of power.
Answered by: MattP
Date published: 2014-07-11

I have a pair of kenwood 555D speakers. Would these woofers drop in ok? The cut out is 10 1/2? I plan on closing the ports off. If it would help the sound. Any thoughts? Old woofers are shot but the rest of the speakers are great. Thanks, glenn

Asked by: glenn6
With the ports sealed up this woofer will work very well in the cabinet but I cannot specifically say it will be better or worse than what you had. The cutout will also need to be enlarged, these will only fit an 11" diameter hole.
Answered by: MattP
Date published: 2014-06-16

Is the GRS 12PR-8 a good replacement for the 12" woofers in my old Yamaha NS 690 II ? The cabs are sealed. Original woofers have squared off frame, recessed mount on baffle. Mounting gasket?

Asked by: Charlietahoe
This woofer will work well in that enclosure although the recess and cabinet cutouts will probably need to be modified to get it to fit properly.
Answered by: MattP
Date published: 2014-05-29

I was considering this for a ported sub box, till I saw the optimum size listed as 31 cubic feet? Really? Maybe I can punch a wall through to the garage and park my car in the driveway. Is this spec correct?

Asked by: VidiMan
Yes this spec is accurate. This woofer has a very high Qts which means it requires very large boxes for both sealed and vented alignments. The best applications for this would be sealed or IB type applications when a box is not specifically required. I would not recommend this for a ported design.
Answered by: MattP
Date published: 2014-05-09

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