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MB Quart FKB113

180W Peak (90W RMS) 5.25" Formula Series 2-Way 4-ohm Coaxial Car Speakers

MB Quart
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• 90 watts Peak Each, 45 watts RMS Each
• 1" Aluminum Dome tweeters
• Lightweight Thermoformed Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 88 dB

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List price $69.99
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-57%

$29.99

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Current Promotions (12 offers)


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MB Quart FKB113

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Description


MB Quart brand icon

Authorized dealer


MB Quart FKB113

The MB Quart FKB113 is a 5-1/4" Formula Series 2-way coaxial car speaker designed for clean, balanced sound in a wide range of vehicles. Each speaker handles 45 watts RMS (90 watts peak per pair) and features a lightweight thermoformed polypropylene cone with a 1" aluminum dome tweeter for crisp, detailed highs. Built to last, it incorporates a butyl rubber surround, epoxy-reinforced natural fiber spider, ferrite magnet motor, and a heavy-gauge stamped steel frame. An integrated 6dB crossover and over-coil cooling provide performance efficiency, while a 4-ohm impedance, 60–20,000 Hz frequency response, and 88 dB sensitivity ensure strong audio output. Protective speaker grilles are included for a complete and durable installation.


Product Details:

  • 5-1/4" Formula Series 2-way Coaxial Car Speakers
  • Power Handling:
    • Peak: 180 watts per pair / 90 watts each
    • RMS: 90 watts per pair / 45 watts each
  • Lightweight Thermoformed Polypropylene cone material
  • Butyl Rubber speaker surround
  • 1" Aluminum Dome tweeters
  • Pure copper voice coil on Kapton former
  • Ferrite magnet motor structure
  • Textured ABS gasket assures a rigid linear seal to the mounting surface
  • Natural fiber spider for flexibility with infused epoxy for strength
  • Over-coil cooling system allows air exchange
  • 6dB internal crossover integrated into the design
  • Heavy gauge progressive-die stamped steel frames
  • Tinsel lead for high power applications
  • Use spade connectors or solder direct for best connections
  • Top-mount Depth: 2"
  • Cutout Dimensions: 4.53"
  • Impedance: 4 ohm
  • Frequency Response: 60 - 20,000 Hz
  • Sensitivity: 88 dB
  • Protective speaker grilles included
  • Authorized Internet Dealer
  • MFR #: FKB113
  • 1-year Manufacturer's Warranty

  • Priced Per Pair


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Specifications & Details


Speaker Specifications
Series
Formula Series
Priced Per
Pair
Number of Speakers
2
Speaker Size
5-1/4"
Design
2-way Coaxial
Tweeter Design
Dome
Tweeter Size
1"
Tweeter Composition
Aluminum
Woofer Composition
Thermoformed Polypropylene
Woofer Surround
Butyl Rubber
Peak Power Handling
90 watts
RMS Power Handling
45 watts
Total PEAK Per Pair/Set
180 watts
Total RMS Per Pair/Set
90 watts
Sensitivity
88 dB
Frequency Response
60 - 20,000 Hz
Impedance (Per Voice Coil)
4 ohm
Shallow Mount Installation
No
Magnet Type
Ferrite
Top-Mount Depth (Mounting Depth)
2"
Bottom-Mount Depth
2.48"
Cutout Dimensions
4.53"
CTA-2031 Compliant
No
General specifications
Marine Certified
No
Hi-Res Certified
No
Color
Black
Illumination
None
Speaker Grilles
Yes
Includes Damping Kit
without Damping Kit
Compatible vehicle types
Car/Truck/SUV/Van
What is in the box?
Paperwork
User manual
WITB: Speakers
Speakers (2)
Grilles (2, attached)
Mounting screws (8)
Mounting clips (8)
Speaker connection cables (2)
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Item Details


Manufacturer:

Model Number:

FKB113

Weight:

3.20lbs

Internal SKU:

fkb113

Internal Product ID:

146215

Customer Ratings & Reviews


MB Quart FKB113 thumbnail image

5 star
75%
4 star
25%
3 star
0%
2 star
0%
1 star
0%



Durability
4.7
Value
4.7
Features
4.7
Design
5
Usability
5

Customer Reviews

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By Michelle on October 20, 2023 Checkmark Icon Verified purchase

7 found this helpful


Good Little Speakers!

These are a great budget 5.25" option and they were on massive sale! MB Quart does it again!

By Kyle on September 30, 2024 Checkmark Icon Verified purchase
1992 Ford Ranger

1 found this helpful


By Jordan on August 10, 2024 Checkmark Icon Verified purchase
1999 Pontiac Grand Prix

1 found this helpful


By Nick on May 18, 2025 Checkmark Icon Verified purchase




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Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:

  • You see only parts engineered for your exact vehicle
  • You avoid incompatible radios, speakers, or wiring
  • Installation is smoother, faster, and frustration-free
  • You get the correct accessories the first time

Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.