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Black 4x6 inch 2-way coaxial car speaker with aluminum dome tweeter

MB Quart

MB Quart FKB146 Formula 4x6" 2-way car speaker

SKU CH-4MRQ-165F8 MPN FKB146

4×6″ two-way coaxial speakers with aluminum dome tweeters, 45 W RMS and 90 W peak power

  • Type2-way Speaker
  • Speaker Size4" x 6"
  • Vehicle TypeAutomotive
  • ColorBlack
  • Peak Power90 Watts
  • RMS Power45 Watts
  • Aluminium dome tweeter delivers crisp highs
  • 45 W RMS handles sustained power cleanly
  • 55 Hz – 20 kHz range covers full musical spectrum
  • 88 dB sensitivity works well with factory head units
  • 4 Ω impedance matches standard car amplifiers

Formula Series 4x6" Coaxial Speakers

These MB Quart Formula FKB146 speakers are 4" x 6" two-way coaxial units designed for automotive audio upgrades. They suit drivers who want a direct factory-replacement fit with a balanced frequency response from 55Hz to 20kHz.

Check Mounting Cut-Out and Depth

Verify that your door or dash opening matches the 5.5 x 3.46 inch mounting cut-out and that at least 3 inches of clearance exist behind the panel. The 4-ohm impedance works with most head units and external amplifiers rated for that load.

Aluminium Dome Tweeters and Butyl Surrounds

Black aluminium dome tweeters handle high frequencies at a 6kHz crossover point with a 12dB slope. Polypropylene cones use butyl rubber surrounds for durability against temperature swings, while the 88dB sensitivity delivers adequate output from modest power.

Highlights

  • Aluminium dome tweeter delivers crisp highs
  • 45 W RMS handles sustained power cleanly
  • 55 Hz – 20 kHz range covers full musical spectrum
  • 88 dB sensitivity works well with factory head units
  • 4 Ω impedance matches standard car amplifiers

Specifications

BrandMB Quart
SeriesFormula Series
Type2-way Speaker
Speaker Size4" x 6"
ModelFKB146
Vehicle TypeAutomotive
ColorBlack
Peak Power90 Watts
RMS Power45 Watts

Questions about this item

Does the box include speaker grilles and mounting hardware, or must I buy them separately?

The FKB146 ships as a pair of 4 x 6 inch 2-way coaxial speakers with integrated aluminium dome tweeters and butyl rubber surrounds. Grilles and mounting hardware are included in the box.

How do I decide between the Formula FKB146 and other MB Quart 4 x 6 inch models?

Choose the Formula FKB146 if you want 45 W RMS, 90 W peak, 4 Ω impedance, 55 Hz – 20 kHz response and 88 dB sensitivity in a 3 inch mounting depth. Other series may offer different power handling or frequency range.

What does the 45 W RMS rating mean when the speakers are driven by a typical car head unit?

At 45 W RMS the speakers can handle continuous clean power from an amplifier rated around 45 W per channel at 4 Ω. A standard head unit usually delivers less, so the speakers will play loudly without distortion.

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