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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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
    (36 Reviews)
  • Weight2.85 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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View similar products to the GRS 6PR-8 6-1/2" Poly Cone Rubber Surround Woofer
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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 36.
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
Rated 5 out of 5 by from 4 in pair of Advent Laureate speakersbuilt new crossovers 4.7uF / 0.15 mH shared choke for parallel GRS. Orig tweeter kept.
Date published: 2014-05-04
Rated 5 out of 5 by from What I was looking for.I bought a pair to repair an old set of Home Built two-way speakers. These speakers where the ticket. They where inexpensive and they sound good.
Date published: 2014-04-22
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: 2014-02-09
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: 2014-02-05
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: 2014-01-19

Product Q&A

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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

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

The mounting holes on my existing Sonance in wall speakers are 6-1/2". Just wanted to make sure as there are hundreds of different options before purchasing. Are these the same?  Thanks

Asked by: Drumming
The mounting holes on this speaker will be about 6-1/4" since the frame itself measures 6-1/2". I do not have a speaker with screw holes at exactly 6-1/2".
Answered by: MattP
Date published: 2014-05-08

Would these work as replacement car audio door speakers

My Toyota Tundra has 6.5" in the door, and a tweeter mounted in the door above the speaker but below the shark fin. The tweeter is about 12 inches above the woofer. I want to build a two way system on the cheap using this as the mid. Would these work in a door baffle (IB)?
Asked by: Brandon
That should work fine. Given the wide frequency response of this speaker, you will have a real good sounding system in your car.
Answered by: Joe from San Francisco
Date published: 2013-10-22

What is the vent dimensions for vented box volume?

What is the volume/dimension for the vented volume listed in box size section? 1.48 cu. ft., 43hz
Asked by: alrightkid
The vent for this volume and F3 would only need to be a 2" hole in the box assuming 3/4" thick material.
Answered by: MattP
Date published: 2014-03-18

Stuck in the middle...

Project: budget version of Paul Carmody's "Dayton Classic Revivals."Each tower will house:1- Goldwood GT-510 1" Soft Dome Tweeter1- GRS 6PR-8 6-1/2" Poly Cone Rubber Surround Woofer2- GRS 8PR-8 8" Poly Cone Rubber Surround WoofersThinking sealed 6.5" and vented F3 8" (hoping it gets close to 29Hz) with a low-pass of 1000Hz for the 8" and a high-pass of 5,000Hz for the tweeter.Question: Do I need an additional high-pass and/or low-pass for the 6.5"?
Asked by: New Guy
Interesting combination. If you intend the 6&1/2" to be an additional woofer, then you should "in theory" use a low pass for it as well. As a low mid--you will need "again in theory" to use a separate high pass at say-800Hz-1000Hz and a low pass at 5KHz. Phase is also a concern. The reason for these crossovers is to reduce or eliminate "intermodulation" of speakers. If you ever tried to plug a mic into a guitar amp-{while a guitar is also playing} you will get a voice-over effect. A cone tries to reproduce a large wave AND a smaller wave at the same time. Check with PE's building loudspeakers for really good tables of crossover and woofer components. The real joy of audio is figuring out a solution. THAT WORKS!!
Answered by: Joe from San Francisco
Date published: 2013-09-28

Customer Projects

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