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GRS 12PF-8 12" Paper Cone Foam Surround Woofer

Brand:| Model: 12PF-8
GRS 12PF-8 12" poly-laminated paper cone woofers are perfect for use in sealed-box home theater and music systems.
  • Perfect for use in sealed-box home theater and music systems
  • Poly-laminated paper cone, treated foam surround, and polymer dust cap
  • Smooth frequency response with minimal cone breakup
Part # 
Weight: 3.85 lbs.  
List Price$19.99
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Your Price
Buy 4-up$12.70
Part # 292-412
Qty:  EA
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Product Details

GRS 12PF-8 12" Paper Cone Foam Surround Woofer

GRS 12PF-8 12" poly-laminated paper cone woofers are perfect for use in sealed-box home theater and music systems. Thanks to their carefully optimized parameters, GRS 12PF-8 12" poly-laminated paper cone woofers offer a high degree of compatibility when used as replacement speakers—they also provide excellent performance in new projects, too.

Product Specifications
  • Nominal Diameter12"
  • Power Handling (RMS)120 Watts
  • Power Handling (max)240 Watts
  • Impedance8 ohms
  • Frequency Response35 to 5,000 Hz
  • Sensitivity87 dB 1W/1m
  • Voice Coil Diameter1.5"
Thiele-Small Parameters
  • Resonant Frequency (Fs)35 Hz
  • DC Resistance (Re)7.56 ohms
  • Voice Coil Inductance (Le)1.15 mH
  • Mechanical Q (Qms)5.97
  • Electromagnetic Q (Qes)2.08
  • Total Q (Qts)1.54
  • Compliance Equivalent Volume (Vas)5.28 ft.³
  • Maximum Linear Excursion (Xmax)3.5 mm
Materials of Construction
  • Cone MaterialTreated Paper
  • Magnet MaterialFerrite
Mounting Information
  • Overall Outside Diameter12"
  • Baffle Cutout Diameter11.0625"
  • Depth4.69"
  • # Mounting Holes6
Optimum Cabinet Size *
  • Sealed Volume2.92 ft.³
  • Sealed F340 Hz
  • Vented Volume73 ft.³
  • Vented F319 Hz
  • * Enclosure volume/F3s based on BassBox "optimum" calculations-
GRS 12PF-8 12" Paper Cone Foam Surround Woofer
  • BrandGRS
  • Model12PF-8
  • Part Number292-412
  • UPC844632088490
  • Product CategoryWoofers
  • Unit of MeasureEA
  • Product Rating
    (19 Reviews)
  • Weight3.85 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 12PF-8 12" Paper Cone Foam Surround Woofer
GRS 12PF-8 12" Paper Cone Foam Surround Woofer is rated 4.3158 out of 5 by 19.
Rated 4 out of 5 by from Fixing up an old friendI purchased these woofers to rebuild a set of KLH cabs that I picked up on the side of the road. There were no drivers in them, and still need a little bit of work, but along with some new mids to go in as well they are turning out well.These woofers sound great, a lot better than the DVC subs I had in them before.
Date published: 2014-03-05
Rated 3 out of 5 by from You get with what you pay for.I'd figure these would replace the old ones I had with a lot more boom, but they can only handle so much power for what I do. They're pretty good, I'm not gonna lie, but up to a certain volume of sound.
Date published: 2014-01-31
Rated 4 out of 5 by from Good value for the moneyI recently bought 2 of these speakers to replace a pair of broken subwoofers. These are fairly inexpensive subs. but the bass produced by them is very good and loud.They are definitely worth the money.
Date published: 2013-10-27
Rated 3 out of 5 by from They work well in my homemade garage stereoBuilt a set of speakers about 3 years ago using Birch with 12" woofers from a set of B&W loud speakers. The boxes are garage quality and were built solid. Needless to say the 30+ year old foam surrounds on the woofers crumbled to dust under heavy use from a 500 watt 40 year old JVC amp that was imported from Germany. Condition as arived was good on one woofer and less than par on the other woofer with a bent basket that i had to straighten out to mount. Overall sound quality is way better than i originally thought. Very punchy and not alot of boom. With my soft dome RS midranges and a set of P-E blowout 1" softdome tweeters, these added new life to a set of garage speakers that get a pounding on a regular basis. Sad thing is I want to swap them with my home speakers...
Date published: 2013-10-27
Rated 4 out of 5 by from Great ServiceI ordered two of these speakers to replace worn ones in my barn stereo. One of them had a rattle. When I contacted Parts Express about it they replaced it at no cost and shipped for free. Two days after I let them know of the problem I had a new speaker that worked fine.
Date published: 2013-10-27
Rated 4 out of 5 by from Electric Double Bass !Big surprise. I tested it (single woofer, no mid or tweeter) in a bare 3 cu ft. particle board box and with a Lyons LB-40 bass I can make it sound nearly like a standup double bass (acoustic). Pretty close, enough to clock yer head in puzzlement. I dampened the box and it lost a good bit of the double bass sound. About 3/4 front pickup, 1/3 rear pickup and a bit under 1/2 treble on the bass, with the amp set for pretty flat, a bit more bass. Running maybe 100 watts, 3/4 of 140 watts. One 87 db spl woofer ain't gonna blow windows out on 100 watts. I wish I had a trap door to jerk the damping out to get that sound at will.I can equalize this speaker to get a wide range of sounds.Used for a practice amp. Would you really trust a real gig on a 4x12 of $15 speakers ? Maybe, the future will tell. I do want to make a 4x12 and see how it works out.
Date published: 2013-10-27

Product Q&A

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GRS 12PF-8 12" Paper Cone Foam Surround Woofer

What is the diameter between mounting holes? Thank you.

Asked by: Clint
I was disappointed to find that there were actually 6 holes when indeed the pictures posted show 8. I have an 8 hole mount and it appeared it was a "drop in" replacement. Not so. And yes, it's a big deal when you're up off the floor 25 feet only to find this out.
Answered by: ukfan4sure1
Date published: 2012-10-17

Ported Alignment

I plan on using this in a ported alignment under a bed for moderator listening and mostly sounds FX.I understand this device works better with a sealed enclosure about 3.0 cu.ft., but is there any smaller configuration possible? This would include porting and sealed boxes.
Asked by: Andy Lancaster 321
Thiele/Smalle specifications determine if a driver is suitable for porting, sealed or both. And typically, even if both - one is better that the other. This driver was built and designed for sealed enclosures. If you plug the numbers into a box calculator - you will find that the specs for a ported box don't make sense. That is because the driver specs don't support that configuration. As for size of sealed box... that same calculator will show you response curves for various box sizes. .707 total Qts delivers razer flat response. 1.0 has a bump in the lower mid-bass, and .5 is critically accurate - often used in esoteric audiophile systems.
Answered by: MarkAJH
Date published: 2012-09-14


can i put this 12 inch sub in a 1.38 cubic feet sealed box and it still sound nice??
Asked by: lytro96
You need to take the specs (theile-smalle parameters) and plug them into an "online box calculator". It will then tell you the volume and tuning for a ported enclosure. You'll see response curves and the 3db down point for bass response. You will also see the same for a sealed box. Specify a total Qts of .707 for the most accurate bass. I can't use the adjective "nice" - but can say that if you use this method - that you will get optimum performance from this driver.
Answered by: MarkAJH
Date published: 2012-09-28

Is it possible to get a full set of thiele-small parameters for this driver? I am specifically looking for Bl and Sd figures.

Asked by: usw10
Unfortunately the manufacturer does not specify what these figures are. However, my modeling program gives me an Sd of 494.6 sq cm and a BL factor of 6.197 Tm. These are based on the rest of the parameters and calculated via BassBox.
Answered by: MattP
Date published: 2013-06-20

Internal Cabinet Size?

what size cabinet would these need if they are inside a sealed cabinet? Also what cross-over frequency should you use when paired with a GRS 8PF-8 and Dayton Audio DC28F-8?
Asked by: Jarad
Great price speaker but not much else. This unit needs a large sealed box, infinite baffle or dipole use.because of its high Qts or total Q. Because the x max is only 3 mm you will need several of them. Remember a doubling of x max will give you 6 db more output. Also remember that 87 db efficiency is low. Every 3 db increase in efficiency will require an amp 1/2 the size. Each time you doudle the number of drivers you get a 3 db increase in efficiency for the same power. This is very important because as a voice coil heats up you get dynamic compression. I can only recommend this driver in multiples. I would recommend at least 4 per channel for 93 db efficiency. Good luck Ralph
Answered by: hifiralph
Date published: 2012-04-30

can you put the grs 12'' with the grs 8'' and the Goldwood GT-510 tweeter in the same sealed box

I was wondering if you could put the GRS 12PF-8, GRS 8PF-8, and the Goldwood GT-510 tweeter in the same sealed box with an internal volume of 3.295 cubic feet and the sound not be distorted at all.
Asked by: lytro96
Tweeters and most mids have sealed backs. Drivers that have open backs need to have their own chamber - volume designed to match their specs. So no, you can't put the 12 and the 8 in the same air space. Each air space needs to be determined by taking the specs and using an online speaker box calculator.
Answered by: MarkAJH
Date published: 2012-09-28

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