GRS 6PR-8 6-1/2" Poly Cone Rubber Surround Woofer

Brand:| Model: 6PR-8
GRS 6PR-8 6-1/2" polypropylene cone woofers with butyl rubber surrounds are great replacement speakers, but also provide excellent performance in 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: 2.85 lbs.  
List Price$18.99
You Save44%
Your Price
Buy 4-up$8.42
Part # 292-426
Qty:  EA
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Product Details

GRS 6PR-8 6-1/2" Poly Cone Rubber Surround Woofer

GRS 6PR-8 6-1/2" polypropylene cone woofers with butyl rubber surrounds are great replacement speakers, but also provide excellent performance in new projects.

Product Specifications
  • Nominal Diameter6-1/2"
  • Power Handling (RMS)60 Watts
  • Power Handling (max)85 Watts
  • Impedance8 ohms
  • Frequency Response60 to 8,000 Hz
  • Sensitivity85 dB 1W/1m
  • Voice Coil Diameter1.5"
Thiele-Small Parameters
  • Resonant Frequency (Fs)75 Hz
  • DC Resistance (Re)7.55 ohms
  • Voice Coil Inductance (Le)1.11 mH
  • Mechanical Q (Qms)4.32
  • Electromagnetic Q (Qes)1.34
  • Total Q (Qts)1.02
  • Compliance Equivalent Volume (Vas)0.24 ft.³
  • Maximum Linear Excursion (Xmax)3 mm
Materials of Construction
  • Cone MaterialPoly
  • Surround MaterialRubber
  • Magnet MaterialFerrite
Mounting Information
  • Overall Outside Diameter6.5"
  • Baffle Cutout Diameter5.625"
  • Depth3.0625"
  • # Mounting Holes4
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume0.29 ft.³
  • Sealed F378 Hz
  • Vented Volume1.48 ft.³
  • Vented F343 Hz
GRS 6PR-8 6-1/2" Poly Cone Rubber Surround Woofer
  • BrandGRS
  • Model6PR-8
  • Part Number292-426
  • UPC844632088513
  • Product CategoryWoofers
  • Unit of MeasureEA
  • Product Rating
    (41 Reviews)
  • Weight2.85 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 6PR-8 6-1/2" Poly Cone Rubber Surround Woofer
GRS 6PR-8 6-1/2" Poly Cone Rubber Surround Woofer is rated 4.6585 out of 5 by 41.
Rated 5 out of 5 by from Remarkable replacement!I needed to replace the mid-range drivers in a pair of NHT2.5's, for which NHT could not even provide any specs regarding the original drivers, or suggested replacements. So by searching through the Parts Express catalog for drivers that would have a good frequency range, and physically fit the cabinet properly, these were essentially my only choice. I thought however for a unit price of less than $15, they wouldn't match up to the original sound of the speakers. Well, I am shocked at how good they sound, and remarkably satisfied!
Date published: 2014-11-12
Rated 4 out of 5 by from 6.5 Inch MidrangeVery nice midrange detail for a 6.5 inch woofer. Look at specs very muted bass response. Makes up for it with really nice midrange. NOT an 8 ohm replacement for the Dayton B652 woofer. Less bass, sweet midrange.
Date published: 2014-10-20
Rated 4 out of 5 by from Mmm...I'm trying these in 1 qbft cabinets, closed, and they sound swollen in the low end which suggests that the box is too small. I'll build 1.5 qbft cabinets next for these. Excellent value. But they are only good up to 1.5k Hz.
Date published: 2014-10-16
Rated 5 out of 5 by from 6 1/2 Surround WooferI purchased two of these 6 1/2" speakers---they have better sound then I expected. I used them in a 1931 Seeburg Selectophone that I rebuilt. Since the unit is small I didn't want something that "boomed" and rattled the jukebox.
Date published: 2014-08-10
Rated 5 out of 5 by from Fantastic improvement over tired JBL woofersThe bass response in my 10 year old JBL bookshelf speakers was poor and getting worse, cracking and popping at even moderate volume. Didn't want to buy new speakers and thought I'd give these a shot. Fast shipping, great price, these woofers have much bigger magnates that the stock JBLs, everything about them is more substantial than the "Made in France" JBL woofers they replaced. A little dremmeling of the wood to get them to sit in the speaker, and the screws bent the outer woofer frame just a little when tightened down. Results? These speakers never sounded so good, the results are dramatic and awesome! Deep dynamic bass (for bookshelf speakers) no problems playing loud, a good amount of eq'ing needed to find a sweet spot but couldn't be happier.
Date published: 2014-08-07
Rated 4 out of 5 by from Excellent sound quality but iffy QCDon't dismiss these because of the low price. I decided to go with these as door midbasses in my latest car audio install after quite a bit of comparison. Price wasn't really a factor (within reason) yet these had the specs I was looking for. Don't expect to pop off your door panels and have these mounted and wired in ten minutes though. These really aren't designed for that.Only one thing kept me from giving a 5 star rating. I received one that had a severe voice coil rub and glue drizzled over the cone and dust cap. Parts Express, being awesome as always, put a replacement in the mail and kept the show going. It made me take a closer look at the other one and the replacement. I couldn't find a single flaw in either of them though.If you're committed to a serious install and spending a couple of hours on each door fabricating trim rings, cutting some metal, sealing, deadening, etc... then these may be what you're looking for. They sound amazing.
Date published: 2014-05-08

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 6PR-8 6-1/2" Poly Cone Rubber Surround Woofer

I ordered two GRS 6PR-8 6-1/2" Poly Cone Rubber Surround Woofers! I'm gonna put them in some Bazooka tubes. What size amp should I put on them?

Asked by: timmy35
An amplifier that provides 50-60 watts RMS into 8 ohms will be plenty for each woofer.
Answered by: MattP
Date published: 2014-10-20

could these serve as a subwoofer in a 1 cubic ft. enclosure along with the sa-100 plate amp and 2 of the dayton rs-100-8 full fange speakers and the dayton dta-120 tripath amp? would it need to be ported? port size/length? price comparative alternatives?

Asked by: Noob
Please contact our tech support for more help with this question, tech@parts-express.com or 800-338-0531 x1.
Answered by: MattP
Date published: 2014-09-23

Do you have these in 4 ohm

Asked by: Nikos
Unfortunately we do not have a 4 ohm version of this GRS woofer available. We have a similar model from Goldwood that is 4 ohm which you can see below.http://www.parts-express.com/goldwood-gw-6024-6-1-2-butyl-surround-woofer-4-ohm--290-351
Answered by: MattP
Date published: 2014-09-03

Anyone kwows the force factor (BL) of this speaker??

Asked by: benny354534561
The calculated BL of this woofer is 6.98 Tm.
Answered by: MattP
Date published: 2014-08-18

Will these work as replacements for a 6 ohm woofer in a older Infinity Sterling SS2002 bookshelf speaker? 

Asked by: pwgphoto
This might be a good match. The first thing to check would be the actual dimensions of the existing driver. Infinity sometimes used unusual frame sizes and it can be difficult to match up aftermarket drivers to them
Answered by: Chrisf
Date published: 2014-06-06

This compared to the Dayton in the Doodle project? Ive been wanting to build my own Home theater system and like the Doodle Audio Project but i was wondering the pros and cons of choosing this GRS instead of the Dayton to save a few bucks.

Asked by: Mike311
The Doodle project is something a customer built and posted to our website, so we do not know any details other than what is online. Assuming the cabinets are sealed, the GRS woofers will work very well, better than the Daytons in this configuration actually in terms of bottom end.
Answered by: MattP
Date published: 2014-04-09

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