5 out of 5
GRS Full-Range 8" Speaker Pioneer Type B20FU20-51FW
* Click "Add to Cart" to calculate shipping and delivery time.
Pricing Note
Product Description
Manufacturer Part Number: 8FR-8
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.
Key Features:
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)
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.
Key Features:
- Replacement for Pioneer B20FU20-51FW
- GRS quality construction
- 1 year warranty
- Superb multipurpose speaker for DIY projects
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 Details | |
|---|---|
| Brand | GRS |
| Model | 8FR-8 |
| Part Number | 292-430 |
| UPC | 844632089800 |
| Unit of Measure | Each |
| Weight | 4.15 |
Product Specifications | |
|---|---|
| Nominal Diameter | 8" |
| Power Handling (RMS) | 60 Watts |
| Power Handling (MAX) | 85 Watts |
| Impedance | 8Ω |
| Frequency Response | 39 to 16,000Hz |
| Sensitivity | 91dB 2.83V/1m |
| Voice Coil Diameter | 1.5" |
Thiele-Small Parameters | |
|---|---|
| Resonant Frequency (Fs) | 39Hz |
| DC Resistance (Re) | 7.02Ω |
| Voice Coil Inductance (Le) | 1.28mH |
| Mechanical Q (Qms) | 2.94 |
| Electromagnetic Q (Qes) | 0.46 |
| Total Q (Qts) | 0.4 |
| Compliance Equivalent Volume (Vas) | 2.26ft³ |
| Maximum Linear Excursion (Xmax) | 3mm |
Materials of Construction | |
|---|---|
| Cone Material | Paper |
| Magnet Material | Ferrite |
Mounting Information | |
|---|---|
| Overall Outside Diameter | 8" |
| Baffle Cutout Diameter | 7.25" |
| Depth | 3.875" |
| # Mounting Holes | 4 |
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion) | |
|---|---|
| Sealed Volume | 0.71ft³ |
| Sealed F3 | 78Hz |
| Vented Volume | 1.76ft³ |
| Vented F3 | 43Hz |
Attention CA Residents: Prop 65 Warning
WARNING:
This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.
Need more information?
Our staff are available to answer any questions you may have about this item
Our staff are available to answer any questions you may have about this item
Look Similar Items By Category
Customer Reviews
By YendorZ
Date: August 29, 2023
Used to replace woofers in old home-made speaker boxes. These are great in little 2-way systems. Good sound with plenty of presence for piano and vocals. Solidly built.
Rating: 
[5 of 5 Stars!]
[5 of 5 Stars!]
By Mark Gray
Date: April 14, 2023
I put this speaker in a 15 watt Marshall guitar amplifier. It smokes, it added all that much tone quality to an already great practice amp. It was an experiment, putting a 200 watt car speaker in a guitar amplifier but it was a great combination.
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By jewalicious
Date: February 13, 2023
Replaced Pioneer 33s , restored 60 year old speakers to a great sounding set for a small investment
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By Dunier
Date: December 04, 2022
Buen sonido y no distorsiona al darle potencia al sistema
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By james j
Date: November 21, 2022
As a hobbyist speaker builder, always wanted to see how whizzer cones / point source react. Huh, way better than expected! Built a sealed box, apx 1 cubic foot, thinking a ported box may fair better with the lows (next build)Running a subwoofer with these, without the sub there is plenty of bass in a smaller room. Mids and highs are great, does the job. Sound stage and instrument separation are incredible! Sensitivity guessing low to mid 90's DB.The magnets are larger than expected, this is a beefy speaker for the money. Highly recommended. Delivery less than 3 days. Totally happy with these.
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By Jack C
Date: September 13, 2022
I put these in an old (circa 1968) Radio Shack Criterion 77 enclosures. All speakers were not working or bad. With some adjustment for the screw holes and soldering the leads, they sound good. Good as a $500 pair, no! Good as my $200 Polks I have in another room? Better. Good as my re-speakered Bose 301s? Yes. These speakers are now in the computer room connected to a 30 year old amp and tuner.All this is low, or no tech. I have no instruments, gear, testers, resistance indicators and assorted other stuff guys like to talk about. Just my ears, that are old enough to appreciate my first Living Stereo album I bought in 1958 at the age of 16. I still have it.
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]