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

Brand:|Model: 12PR-8|Part # 292-422
A GRS 12PR-8 12" 8 ohm polypropylene cone woofer is a good, economical way to repair older speaker systems or create new projects.
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Part # 292-422
  • 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 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
    (38 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.

View similar products to the GRS 12PR-8 12" Poly Cone Rubber Surround Woofer
in the Woofers product category.


GRS 12PR-8 12" Poly Cone Rubber Surround Woofer
GRS 12PR-8 12" Poly Cone Rubber Surround Woofer is rated 4.4211 out of 5 by 38.
Rated 3 out of 5 by from Not bad as a replacementBought this as a replacement for a 12-inch woofer that had had it's surround just dry out and crumble after many years. What I immediately noticed was - less bass (as compared to the original). I attribute this to a rather low efficiency rating of 84 dB. Overall well made, but may need a good amt of power to really push it.
Date published: 2015-10-18
Rated 5 out of 5 by from good woofersI had gotten these woofers to replace 2 woofers that had gotten blown. I but hem in and that sounded great. they have lots of bass and can really shack you house.
Date published: 2015-06-12
Rated 5 out of 5 by from Great ReplacementThis woofer was an EXCELLENT replacement in our SUNN wedge monitor.It actually ended up being a total "upgrade" over the original, with much better performance and sound, especially for the price.
Date published: 2015-02-22
Rated 4 out of 5 by from seem to be good quality replacements.The bass isn't as I expected but these are still good replacement speakers.
Date published: 2014-10-21
Rated 5 out of 5 by from More than what I expected!I purchased these to replace the woofers in a set of Pioneer CS-G301WAII 3-way bookshelf speakers. These are a serious upgrade to these relatively low-end bookshelf speakers. I couldn't be happier. I'm not sure anything could have been a better replacement at any price for these particular speakers. No modification required at all. Balanced response with plenty of very low frequency bass extension when the music requires it. Highly recommended!
Date published: 2014-10-18
Rated 5 out of 5 by from Just RightPerfectly suited my small venue setup. Almost plug and play. Up and running in less than an hour.
Date published: 2014-10-11
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Product Q&A

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

will these work good in my 1980s pro linear stage 100x ser 2 floor speaker which is 12''D 18''W 30''H

Asked by: delo
These will work in that volume but I do recommend sealing the cabinet if it isn't already.
Answered by: MattP
Date published: 2016-01-18

I have pioneer home speakers CS-G301WA, the cones foam are rotten. Looking at these to replace the woofers. The back of the magnet says 141735 8 ohm. A1 or A7 85 10. The speakers total output is 120 w Will these work good for a replacement?  Thank you

Asked by: J king
We do not have a cross reference available for this type of thing. Please contact our tech support for more help with this question, or 800-338-0531 x1.
Answered by: MattP
Date published: 2015-12-30

Would these work in an infinite baffle set up?

Asked by: Jared007
Yes these would be a good choice for an IB setup.
Answered by: MattP
Date published: 2015-10-14

what is the qtc of this driver

Asked by: Mark Bethel
Qtc is actually a box specification and would depend on the cabinet itself. The closest related specification would be the Qts which is 1.26
Answered by: Chrisf
Date published: 2015-08-11

I put in the drivers info into winisd and I got a box volume of 14.ft3 can anyone tell me what is going on. Why is there such a big difference in our calculations?

Asked by: Mark Bethel
Not only are we using a different program, we use numbers that are practical for most applications. These drivers will require huge volumes if you are looking for "ideal" numbers, but will work perfectly fine in much smaller volumes as well.
Answered by: MattP
Date published: 2015-08-12

Diameter is stated as "12 inch nominal". I'm replacing woofers in a 1970's Pioneer system, in which the original woofer is exactly 12 inches in diameter. Is this woofer exactly 12 inches (vs. 12-1/8 or 12-1/4)? Thank you.

Asked by: Dave S
This woofer measures exactly 12" across the frame.
Answered by: MattP
Date published: 2015-07-08
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