5 out of 5
Pricing Note
Product Description
Manufacturer Part Number: 4PF-8
Thanks to their carefully optimized parameters, GRS 4PF-8 4" poly-laminated paper cone woofers offer a high degree of compatibility when used as replacement speakers.
Key Features:
Overview:
GRS 4PF-8 4" Paper Cone Foam Surround Woofer
Thanks to their carefully optimized parameters, GRS 4PF-8 4" poly-laminated paper cone woofers offer a high degree of compatibility when used as replacement speakers-they also provide excellent performance in new projects, too.
Specification:
Manuals & Resources:
Thanks to their carefully optimized parameters, GRS 4PF-8 4" poly-laminated paper cone woofers offer a high degree of compatibility when used as replacement speakers.
Key Features:
- Perfect for use in sealed-box home theater and music systems
- Poly-laminated paper cone, treated foam surround, and polymer dust cap
- Smooth frequency response with minimal cone breakup
Overview:
GRS 4PF-8 4" Paper Cone Foam Surround Woofer
Thanks to their carefully optimized parameters, GRS 4PF-8 4" poly-laminated paper cone woofers offer a high degree of compatibility when used as replacement speakers-they also provide excellent performance in new projects, too.
Specification:
Product Details | |
|---|---|
| Brand | GRS |
| Model | 4PF-8 |
| Part Number | 292-404 |
| UPC | 844632088445 |
| Unit of Measure | Each |
| Weight | 1.4 |
Product Specifications | |
|---|---|
| Nominal Diameter | 4" |
| Power Handling (RMS) | 40 Watts |
| Power Handling (MAX) | 80 Watts |
| Impedance | 8Ω |
| Frequency Response | 100 to 10,000Hz |
| Sensitivity | 83dB 2.83V/1m |
| Voice Coil Diameter | 1" |
Thiele-Small Parameters | |
|---|---|
| Resonant Frequency (Fs) | 137Hz |
| DC Resistance (Re) | 6.8Ω |
| Voice Coil Inductance (Le) | 0.5mH |
| Mechanical Q (Qms) | 5.81 |
| Electromagnetic Q (Qes) | 2.9 |
| Total Q (Qts) | 1.94 |
| Compliance Equivalent Volume (Vas) | 0.04ft³ |
| Mechanical Compliance of Suspension (Cms) | 0.28mm/N |
| BL Product (BL) | 3.1T·m |
| Diaphragm Mass Inc. Airload (Mms) | 4.8g |
| Maximum Linear Excursion (Xmax) | 4.5mm |
| Surface Area of Cone (Sd) | 55.2cm² |
Materials of Construction | |
|---|---|
| Cone Material | Treated Paper |
| Magnet Material | Ferrite |
Mounting Information | |
|---|---|
| Overall Outside Diameter | 4.125" |
| Baffle Cutout Diameter | 3.75" |
| Depth | 2.125" |
| # Mounting Holes | 4 |
Parts Express Staff Recommended Enclosure Volume | |
|---|---|
| Sealed Volume | 0.1ft³ |
| Sealed F3 | 101.4Hz |
Manuals & Resources:
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.
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Customer Reviews
By MarkS
Date: February 19, 2023
Nice speaker and the price was low enough to make repairing my Logitech bass speaker worthwhile. The quality was will within my expectations for the price paid.
Rating: 
[5 of 5 Stars!]
[5 of 5 Stars!]
By Jose M Sanchez
Date: August 31, 2021
I used four of these to fix an ancient Koss powered speaker set. They work perfectly and IMHO sound identical or better than the original drivers.
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By Brad Denman
Date: June 26, 2021
I've two of these to replace my Minimus 7 subs. They work good enough as I have added an actual sub to the system and no longer rely on just these two 4 subs to provide full bass.
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By Samplerman
Date: June 10, 2021
A Great Replacement Speaker for cheap. Reviewers complain about the lack of bass. You must break in any new woofers (like a new pair of shoes). Drive the with as much low end as possible for 50 to 100 hours. The will work in the treated foam surrounds and the spiders.
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By Tom Herman
Date: February 15, 2021
Bought this to replace the woofer in my Creative Labs 2.1 speakers for the PC... perfect match and saved me quite a bit from having to buy a new set. works and sounds great.no mods necessary, exact drop in replacement.
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
Items 1 - 5 of 5 reviews
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