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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
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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 *
  • Sealed Volume0.29 ft.³
  • Sealed F378 Hz
  • Vented Volume1.48 ft.³
  • Vented F343 Hz
  • * Enclosure volume/F3s based on BassBox "optimum" calculations-
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
    (33 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 4.6667 out of 5 by 33.
Rated 5 out of 5 by from Well builtOutstanding sound, you would of never guessed for the price you pay for these speakers you get great sound, highly recommend it expecially if your budget is really tight..
Date published: 2014-03-18
Rated 4 out of 5 by from Thats the ticket! yeah! yeah!Replaced woofer and mid woofer in a pair of aged Sony 3 way loudspeakers in a 5.1 HT system Cabinets are roughly 1.70 cu/ft probably dampened down 25% vented by a 2x2 round port Used these drivers as opposed to replacing the surrounds on the existing drivers These drivers are a great value....although I have never compared a $100 driver to a $8 driver I'ld be willing to bet these hold there own
Date published: 2014-03-18
Rated 5 out of 5 by from Good for bass guitar? Oh yeah!I bought 6 of these to go into a set of bedside drawers that I wanted to turn into a speaker cab (recycling ;) and was suprised with the result!At the moment the baffle I made is not properly sealed nor fixxed solidly on all edges, and the base of the box is fully open and sealed only by the rubber matt I've been using it on.First test was through the sub amp of a car system, highest crossover point was 160 or so; bass was deep, tight, but not excitingly powerfull (quiet) but what can you expect when you take a driver below it's resonant..Tried running them straight out of the headunit and was blown away: mids were awesome highs were pretty directional but the low end sounded better than when it was crossed over. Would make pretty sweet full ranges for a simple iPod dock or home theater satellites.Lately I've been driving these with my Roland Cube60 (60 watt guitar amp) amping my bass guitar: plugged in, turned on, strummed low E, dropped jaw. This was with 4 wired in, 2 mounted passive. All six wired to 5.3 ohms and I had to place wedges in between the back panel and internal bracing of the cabinet to stop the buzzing on certain notes.Sound is so so warm; set the tone on the amp and axe to the harshest setting and still pleasing to the ear; bass not thin at all. Yet to do a more formal test with pure frequencys to determine low cut-off, but sound was still powerfull with my 4string tuned to drop-D, and the amp was set to maybe a quater; yet to try this setup at higher volumes, but my girlfriend still came out to the shed to complain that I was drowning out the tv ;)Build quality:Looks pretty good considering it's $10 a unit; I got these for $6.50 when the $/in sale was on.Basket is as good as you can expect from stamped steel, however the outer mounting flange could be a little thicker but not an issue.No issues with coil rubbing or any other 'off' sounds.Magnet is a pretty decent size.Polarity clearly marked.Looks: pretty slick.Only issue: if your unit/s have the surround covering the mounting holes, be sure that your screws wont grab on the material in anyway - one of mine did. Pinched the suround and pulled it outwards like a pair of tweezers; lossened screw up and surround returned to normal (thank goodness for the rubber surrounds ;)At the end of the day, no problem.ALL IN ALL:This speaker should be in your top 3 choices for a replacement or new project; can not beat the quality-to-price-to-sound ratio, especially in the under $25 range.Just buy it.
Date published: 2014-03-17
Rated 4 out of 5 by from Doesn't fitI'm giving this speaker a 4-star rating. Sound, price, speedy delivery.....all should rate it a 5, but........but: look at the specs. It says it will fit in a 5.625" hole. Guess what? It won't.I had to grab a router & bevel out the 5.625" hole in the baffle to make these fit.I'm a tool guy, so it's no big deal, but if you think you can simply drop this speaker into a 5.625 me: you can't.
Date published: 2014-04-13
Rated 5 out of 5 by from Great moderatly priced wooferPurchased a pair of these units for replacing some old6.5' in. two way Design Acoustics bookshelf loudspeakers that the foam rooted out. These units did not have the lower frequency range or the higher midrange of the original, ( around 55hz or so and up to 3000hz)) but, at the rated 70hz low range , they sound much better as far as greater power handling ability and puncher bass in their range.I have them crossed over to a pair of powered subwoofers at80hz and after breaking them in over a period of weeks, they really sound quite good for the price.
Date published: 2014-04-01
Rated 4 out of 5 by from Inexpensive!These are the absolute best speakers in this price range. They have decent sound and frequency response.
Date published: 2013-11-04

Product Q&A

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

cabinet size

What is the best cabinet size for these woofers if one, or two, per cabinet are used?
Asked by: BR549
Answered by: bigmike
Date published: 2014-04-01

recommended inductor/cap values?

i have 2 of these per door( wired to 4 ohms) in my truck and would like to know what value inductor and capacitor to use to show them a somewhere around 3500HZ lowpass? @ 12 db per oct.i plan in using my head unit to high pass them.
Asked by: PQmodean
Textbook values for a 3,500 Hz low pass crossover at 4 ohms would be a .25 mH inductor and 8 uF capacitor.
Answered by: MattP
Date published: 2013-10-30

Would these be good replacement woofers for Paradigm Compact Monitor speakers?

Paradigm Compact Monitor Speakers measure 8-1/2" x 11-1/2" x 15-1/2". They are a ported design, with a 2" port that runs from the front of the cabinet to the back, only open in the front (11-1/2" long). They had 6 ohm Vifa tweeters and their own 6 ohm 6-1/2" woofers. I had also planned on using the existing stock crossover as it is with just replacing the electrolytic 6.8 mF cap with a poly cap. Is this going to be a problem getting good sound this way? This PE woofer and the replacement tweeters are both 8 ohm drivers. I already have the tweeters so I'd like to use them. They are rated at 60 watts.
Asked by: JoeA
In a ported cabinet like that you would be better off using something like the Dayton DC160-8 which is below. If you wanted, you could seal up the port and use the GRS as it works better in a sealed cabinet.
Answered by: MattP
Date published: 2013-08-13

My truck has OEM separates in the doors and the woofers are blown. OEM is 6.5" 4 ohm powered by OEM amp, would these be a good replacement?

Asked by: ckkone
Typically, you would want to replace a 4Ω speaker with a 4Ω speaker, and the one in question here is an 8Ω model. I would suggest sticking with 4Ω impedance to maintain the proper balance in your system. I've included a few links below for your reference.
Answered by: RussR
Date published: 2014-03-17

Infinity SM62 replacement

I own a pair of Infinity SM62 that are about 18 years old. The foam surrounds are spent. Would these drivers be a decent replacement? At only $9 each it would be cheaper than repairing the original woofers.Ryan
Asked by: rmclark
I would say yes. I have heard the infinity's several times and I have a good bit of experience with this GRS driver so it is an educated guess. I will tell you to expect a shift in the sound. Not necessarily for better or for worse, but they will produce a different character. It is likely to be more noticeable in the lower bass and mid bass than in mids or above. Not sure how to describe what to expect other than possibly a more relaxed sound.
Answered by: Musgofasa
Date published: 2012-06-22

Selenium 6W4P 6"

are these close to Selenium 6W4P 6"? i love them just hate the price and i need to buy 10-6.5 and if i did that with Selenium 6W4P 6" it will be around $400, but if i buy these it will be around $100. plz help me
Asked by: big white
These have quite a few differences from a Selenium model. Lesser power handling, lesser sensitivity and lower Fs generally meaning less output. The Selenium will probably play higher in frequency as well. These are more or less apples to oranges although there is no reason the GRS woofers won't work, just don't compare them so the Seleniums directly.
Answered by: MattP
Date published: 2013-09-06

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