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MB Quart FKB146

180W Peak (90W RMS) 4x6" Formula Series 2-Way 4-ohm Coaxial Car Speakers

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

Learn more about the fkb146

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This item has been discontinued


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Description


MB Quart brand icon

Authorized dealer


MB Quart FKB146

The MB Quart FKB146 is a 4" x 6" Formula Series 2-way coaxial car speaker designed to deliver strong, detailed audio performance in tight factory-fit locations. Each speaker handles 45 watts RMS (90 watts peak per pair) and features a lightweight thermoformed polypropylene cone paired with a crisp aluminum dome tweeter for improved clarity. Built with durability in mind, it includes a butyl rubber surround, epoxy-reinforced natural fiber spider, heavy-gauge steel frame, and a ferrite magnet motor. With a built-in 6dB crossover, over-coil cooling, 4-ohm impedance, and a wide 55–20,000 Hz frequency range, these speakers provide efficient sound upgrade potential with reliable installation flexibility.


Product Details:

  • 4" x 6" 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
  • 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: 3.0"
  • Cutout Dimensions: 5.6 x 3.46 
  • Impedance: 4 ohm
  • Frequency Response: 55 - 20000 Hz
  • Sensitivity: 88 dB
  • Authorized Internet Dealer
  • MFR #: FKB146
  • 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
4" x 6"
Design
2-way Coaxial
Tweeter Design
Dome
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
55 - 20000 Hz
Impedance (Per Voice Coil)
4 ohm
Shallow Mount Installation
No
Magnet Type
Ferrite
Top-Mount Depth (Mounting Depth)
3.0"
Bottom-Mount Depth
2.12"
Cutout Dimensions
5.6 x 3.46 
CTA-2031 Compliant
No
General specifications
Marine Certified
No
Hi-Res Certified
No
Color
Black
Illumination
None
Speaker Grilles
No
Includes Damping Kit
without Damping Kit
Compatible vehicle types
Car/Truck/SUV/Van
What is in the box?
Paperwork
Quick start guide
WITB: Speakers
Speakers (2)
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Item Details


Manufacturer:

Model Number:

FKB146

Weight:

3.00lbs

Internal SKU:

fkb146

Internal Product ID:

146211

Customer Ratings & Reviews


MB Quart FKB146 thumbnail image

5 star
100%
4 star
0%
3 star
0%
2 star
0%
1 star
0%



Durability
5
Value
5
Features
4.5
Design
5
Usability
5

Customer Reviews

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Great value, Great upgrade.

Replaced my rear door speakers in my 02 Silverado and got a great upgrade with these.

By Douglas W on February 8, 2025 Checkmark Icon Verified purchase
2002 Chevrolet Silverado 1500


By charles r on September 27, 2024 Checkmark Icon Verified purchase
2002 GMC Sonoma




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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.