About the JBL 521F

Product highlights:
- 5-1/4" 2-way speakers (pair)
- polypropylene Plus One woofer cone
- PEI dome tweeter
- handles up to 40 watts RMS (120 watts peak power)
- frequency response: 75-20,000 Hz
- impedance: 3 ohms
- sensitivity: 91 dB at 2.83V
- top-mount depth: 1-13/16"
- grilles not included
- warranty: 1 year
- MFR # SPKCON521FAM
- Item # 109CT521
- California customers: Please click here for your Proposition 65 WARNING.
What's in the box:
- Two 2-Way speakers
- Installation instructions
- Template on box
Featured video:
More details on the JBL 521F

Features & specs
General | ||
---|---|---|
Speaker Size | 5 1/4 | |
Driver Design | 2-way | |
Woofer Design | Plus One Cone | |
Woofer Material | Polypropylene | |
Woofer Surround | Rubber | |
Midrange Design | --- | |
Midrange Material | --- | |
Tweeter Design | Dome | |
Tweeter Material | PEI | |
Super Tweeter Design | --- | |
Super Tweeter Material | --- | |
Impedance (Ohms) | 3 | |
Weather-resistant | No | |
Grilles Included | No | |
Parts Warranty | 1 Year | |
Labor Warranty | 1 Year | |
Specifications | ||
Sensitivity (1W at 1 meter) | N/A | |
Sensitivity at 2.83 volts | 91 | |
Frequency Response | 75 - 20k Hz | |
Maximum RMS Wattage | 40 | |
Peak Power Handling (Watts) | 120 | |
Top-mount Depth (Inches) | 1 13/16 | |
Bottom-mount Depth (Inches) | N/A | |
Cutout Diameter or Length (inches) | 4 7/16 | |
Mounting Height (Inches) | 0.313 | |
Frame Width | 5.082 | |
Frame Length | 5.082 |
Product Research
Features
Plus One+ Woofer Cones: Each speaker uses a cone larger than other speakers of the same size. This is accomplished by using a unique basket design and hi-roll surround. The Plus One+ design offers greater bass output and an increase in efficiency.
High-Output Design: The 3Ω voice coil design compensates for the high in-line resistance of small gauge factory wiring, extracting more power from factory (or aftermarket) receivers. This results in clearer, richer sound for the listener.
The JBL 521F replaces these items:
- injection molded polypropylene and mica-reinforced composite woofer cone with rubber-coated cloth surround
- 1-3/16" PET dome tweeter
- handles up to 35 watts RMS (250 watts peak power)
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Customer Q&A
12 questions already asked
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Was super easy to install in my 2015 Smart Fortwo and it sounds great when I added deafening strips to any gaps. Sounds like studio quality and the bass is just right overall the best speaker for the budget.
Noah from Grand Island, FL