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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

  • Speaker unit size4 in × 6 in
  • Compatible vehiclesAutomotive
  • Peak wattage90 W
  • RMS power rating45 W
  • Product type2-way Speaker
  • Product colorBlack
  • 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.

How it compares

Measured against everything we stock in Car Stereo Speakers, at today’s prices. Recalculated every night.

Price $30.99
Cheaper than about 87% of the 379 comparable items (median $104.99).

Specifications

Product
Brand nameMB Quart
Product lineFormula Series
Model nameFKB146
Product type2-way Speaker
Product colorBlack
Audio & video
Speaker unit size4 in × 6 in
RMS power rating45 W
Power
Peak wattage90 W
Compatibility
Compatible vehiclesAutomotive

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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