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GRS 8FR-8 Full-Range 8" Speaker Pioneer Type B20FU20-51FW

Brand:| Model: 8FR-8
Overview
The GRS 8FR-8 full-range 8" speaker is engineered to withstand rigorous commercial use, but will also deliver great results when used in point-source hi-fi applications.
Highlights
  • Replacement for Pioneer B20FU20-51FW
  • GRS quality construction
  • 3 year warranty
  • Superb multipurpose speaker for DIY projects
Part # 
292-430
Weight: 4.15 lbs.  
IN STOCK
List Price$22.99
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Your Price
$14.33
Buy 4-up$11.46
Part # 292-430
Qty:  EA
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Product Details

GRS 8FR-8 Full-Range 8" Speaker Pioneer Type B20FU20-51FW

The GRS 8FR-8 full-range 8" speaker features a paper cone with poly foam surround. A whizzer cone extends high frequency response and dispersion. Engineered to withstand rigorous commercial use, this driver will also deliver great results when used in point-source hi-fi applications. Affordable pricing makes it perfect for DIY applications. Ideal replacement for the Pioneer B20FU20-51FW (also known in DIY communities as the BOFU)



Product Specifications
  • Nominal Diameter8"
  • Power Handling (RMS)60 Watts
  • Power Handling (max)85 Watts
  • Impedance8 ohms
  • Frequency Response39 to 16,000 Hz
  • Sensitivity91 dB 1W/1m
  • Voice Coil Diameter1.5"
Thiele-Small Parameters
  • Resonant Frequency (Fs)39 Hz
  • DC Resistance (Re)7.02 ohms
  • Voice Coil Inductance (Le)1.28 mH
  • Mechanical Q (Qms)2.94
  • Electromagnetic Q (Qes)0.46
  • Total Q (Qts)0.4
  • Compliance Equivalent Volume (Vas)2.26 ft.³
  • Maximum Linear Excursion (Xmax)3 mm
Materials of Construction
  • Cone MaterialPaper
  • Magnet MaterialFerrite
Mounting Information
  • Overall Outside Diameter8"
  • Baffle Cutout Diameter7.25"
  • Depth3.875"
  • # Mounting Holes4
Optimum Cabinet Size *
  • Sealed Volume0.71 ft.³
  • Sealed F378 Hz
  • Vented Volume1.76 ft.³
  • Vented F343 Hz
  • * Enclosure volume/F3s based on BassBox "optimum" calculations-
GRS 8FR-8 Full-Range 8" Speaker Pioneer Type B20FU20-51FW
  • BrandGRS
  • Model8FR-8
  • Part Number292-430
  • UPC844632089800
  • Product CategoryWoofers
  • Unit of MeasureEA
  • Product Rating
    (25 Reviews)
  • Weight4.15 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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Reviews

GRS 8FR-8 Full-Range 8" Speaker Pioneer Type B20FU20-51FW
GRS 8FR-8 Full-Range 8" Speaker Pioneer Type B20FU20-51FW is rated 4.36 out of 5 by 25.
Rated 5 out of 5 by from Great SpeakerI bought these speakers (pair) to put in my existing Tannoy speakers. They were easily installed and sound awesome. Very nice product and I recommend them to anyone. Great price for a really quality product.
Date published: 2014-03-18
Rated 4 out of 5 by from Great replacement speakerI had replaced the original name brand speaker not available from the factory for this one, the speaker sound like never had before, good bass, natural mid-range and the high frequency was provided by the original tweeter, our customer was very satisfied
Date published: 2014-02-04
Rated 5 out of 5 by from Good speaker at a resonable price.Bought these speakers to replace some blown speakers that been sitting around for years since the late 80s. Used to buy my speakers at Radio Shack and realized that theyre selection was quite limited from what I remember before so i decided to do some searching online and found this website and was surprised to find a huge selection and will be using your site in the future.Thanks
Date published: 2014-01-22
Rated 4 out of 5 by from bargin priceI purchased these as replacements for speakers that I have in my garage. They sound very good for the price. I would buy from parts express again
Date published: 2013-10-07
Rated 5 out of 5 by from This was a great deal.These speakers sound great. It sounds like there are 2 separate speakers.
Date published: 2013-09-23
Rated 5 out of 5 by from Great bang for the buckI needed two replacement full range speakers to go in some small floor monitor cabinets, and since these were on sale and could handle the power, I thought I would try them out. The test I made after installation revealed nice, clean sound with enough definition in the highs and lows to suit my needs just fine. I could not have done better for less than $10 per cone!Thanks again Parts Express,Paul S.
Date published: 2013-09-20

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 8FR-8 Full-Range 8" Speaker Pioneer Type B20FU20-51FW

what tpy of box should l build for this 8" speaker.

GRS 8FR-8 Full-Range 8" Speaker Pioneer Type B20FU20-51FW
Asked by: mbute
I've come up with three designs.1) Ported bookshelf: 17-3/4" H x 11" W x 9" D. Use a 2-1/2" diameter port that is 8-1/2" long. That will tune the box to 45 Hz and give you an F3 of 64 Hz.2) Ported tower: 36" H x 10" W x 10" D. Use a 3-3/4" diameter port that is 7-5/8" long. That will tune the box to 44 Hz and give you an F3 of 46 Hz.3) Sealed bookshelf: 17-3/4" H x 11" W x 9" D. The F3 would be 78 Hz and the Qtc would be 0.737.
Answered by: mikevv
Date published: 2013-09-22

Where's the frequency response graph for this driver?

Asked by: neobop
Unfortunately PE does not have this information available. However, below is the information I obtained from the Dayton WT3 Woofer Tester:* This data was exported from the Dayton Audio WT3 Woofer Tester** Manufacturer: GRS* Model: 8FR-8* Piston Diameter = 165.1 mm* f(s)= 63.25 Hz* R(e)= 7.43 Ohms* Z(max)= 49.80 Ohms* Q(ms)= 5.702* Q(es)= 1.000* Q(ts)= 0.851* V(as)= 32.170 liters (1.136 cubic feet)* L(e)= 1.14 mH* n(0)= 0.78 %* SPL= 91.00 1W/1m* M(ms)= 12.67 grams* C(ms)= 0.50 mm/N* BL= 6.12
Answered by: BamaBoy
Date published: 2013-10-10

am i correct to assume that full range speakers dont require crossovers?

Asked by: fatuncle
Normally on most installations, fullrange Drivers do not require any type of X-over, so no.
Answered by: SpeakerFreak95
Date published: 2013-01-12

What is the exact OD and flange thickness for flush mounting?

Asked by: agcuxtal guy
Frame diameter is 7-31/32", I would recommend cutting it to 8" for clearance. The frame/gasket thickness is 11/32".
Answered by: MattP
Date published: 2012-11-12

What size port for a 40" high cylinder with an 8 inch internal diameter?

According to BamaBoy's measurements, an 8" concrete forming tube about 40" high would approximate the Vas. I'm thinking of making el-cheapo omni-directional full-ranges out of these, and the 40" height should work well with an omni-cone above an up-facing driver... but it has been years since I tinkered and I don't have any software anymore.
Asked by: atropos
The port size for this driver in that enclosure would be 2" in diameter and 4" long. This will provide a tuning frequency of 36 Hz.
Answered by: MattP
Date published: 2013-06-29

What is the Sd of this driver? I'm trying to do some box modelling and this is required.

Asked by: Rookie
The manufacturer does not offer this specification, but I calculate 41.28 square inches for this one.
Answered by: Chrisf
Date published: 2013-06-26

Customer Projects

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