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Rockford Fosgate FNQ3614

6-3/4" fanatic Q Components

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Item # 575FNQ3614

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Our take on the Rockford Fosgate FNQ3614

Take a giant step toward the ultimate car audio system with Rockford Fosgate's fanatic Q FNQ3614 6-3/4" component system. These innovative components offer cutting-edge construction and stunning musical reproduction.

Take a giant step toward the ultimate car audio system with Rockford Fosgate's fanatic Q FNQ3614 6-3/4" component system. These innovative components offer cutting-edge construction and stunning musical reproduction.

The 6-3/4" aluminum woofer, housed in its cast aluminum basket, performs with extreme accuracy throughout the lower and midrange frequencies. An aluminum phase plug improves midrange dispersion, while the Thermal Plastic Rubber (TPR) surround extends speaker life and improves bass response.

The 1" inverted aluminum dome tweeter creates a wide-dispersion pattern for superior imaging, extending high-end response well beyond 20,000 Hz. (It can be wedge-, surface-, or flush-mounted.) An audiophile-quality 2-way crossover ensures supreme accuracy with a flawless transition from low to high frequencies. Selectable (0, -3, or -6 dB) pads allow you to match the output levels of a woofer and tweeter mounted in separate locations.

  • 6-3/4" aluminum woofer with TPR surround and aluminum phase plug
  • cast-aluminum woofer basket
  • 1" aluminum dome tweeter with TPR surround
  • 2-way crossovers (3,200 Hz at 12 dB/octave low-pass; 24 dB/octave high-pass)
  • frequency response 40-24,000 Hz
  • power range 8-100 watts RMS
  • peak power handling 200 watts
  • sensitivity 91 dB
  • woofer top-mount depth 2-9/16"
  • 1-year warranty

What's in the Box:

  • 2 Woofers
  • 2 Grilles
  • 2 Grille rings
  • 2 Tweeters installed in flush-mount adapters (each flush-mount adapter has 2 clips and 2 screws)
  • 2 Crossovers
  • 2 Surface-mount tweeter housings
  • 2 Wedge-mount tweeter housings
  • One 20' length of speaker wire (has bare wire on both ends)
  • Two 6" lengths of speaker wire (each length of speaker wire has bare wire on one end and quick-slides on the other end)
  • Two 0.205" female quick-slides with clear rubber insulators
  • Two 0.110" female quick-slides with clear rubber insulators
  • Eight 1-1/4" self-tapping screws
  • Six 1" self-tapping screws
  • Four 3/4" self-tapping screws
  • Installation & Operation manual (English/Spanish/French/German/Italian)
  • "Team RF" sticker

Hands-on research

Features and Specs

Speaker Size
Design 2-way
Tweeter Design 1" Inverted dome
Impedance (Ohms) 4
Tweeter Composition Aluminum
Woofer Composition Aluminum
Woofer Surround Thermal Plastic Rubber
Parts Warranty 1 Year
Labor Warranty 1 Year
Sensitivity (1W at 1 meter) 91
Sensitivity at 2.83 volts N/A
Frequency Response 40 - 24k Hz
Minimum RMS Wattage 8
Maximum RMS Wattage 100
Peak Power Handling (Watts) 200
Top-mount Depth (Inches) 2 9/16
Bottom-mount Depth (Inches) 2 3/4
Cutout Diameter or Length (inches) 5 9/16

Product Research

Specification Note


Woofers: The aluminum woofer cones offer clean, accurate midrange reproduction and superior power handling.

Surrounds: Each woofer uses a Thermal Plastic Rubber (TPR) surround for extended speaker life and improved bass response.

Flat Spider: The spider has the job of centering the voice coil and providing the rear suspension for the speaker. The Fanatic Q Component system woofers use a flat spider to ensure great sound with long life and durability.

Cast Aluminum Baskets: Cast aluminum baskets inhibit speaker resonance for superior sound.


Tweeters: Each 1" tweeter features an inverted aluminum dome suspended by a Thermal Plastic Rubber surround. The tweeters are driven by powerful neodymium magnets, resulting in higher power handling and superior detail.

Tweeter Mounting Options: The tweeters may be flush, surface, or "wedge" mounted. The "wedge mount" sockets are surface mounts that hold the tweeters at a fixed angle (may be mounted to provide a 10 or 60 degree angle). The tweeters must be installed using one of the three sockets.

Note: The tweeters come installed in the flush mount sockets. To remove the tweeter from the socket, turn the tweeter counterclockwise, then lift it out of the housing.

Tweeter Mounting Dimensions:

  Flush Mount Surface Mount "Wedge Mount" (fixed 10 or 60 degree angle)
Mounting Depth 1.235" 0.677" (screw depth) 0.677" (screw depth)
Mounting Height 0.158" 0.832" 1.797" (60 degrees) or 0.957" (10 degrees)
Cutout Diameter 1.936" NA NA
Frame Diameter 2.081" 1.864" 1.848"


2-Way Butterworth Crossovers: The crossovers feature a 24dB/octave, 3.2kHz high-pass network for the tweeters and a 12dB/octave, 3.2kHz low-pass network for the woofers. The steep slope of the high-pass network allows the tweeters to handle greater power, while the low-pass network provides for a seamless transition between the tweeter and woofer.

Optical Compression Tweeter Protection: This built-in protection circuit includes two incandescent bulbs and limits power to the tweeter when the "danger" threshold is exceeded. This method of protection is inaudible because the circuit simply limits power and does not shut the tweeter off. The bulbs are user replaceable.

Selectable 0dB/-3dB/-6dB Tweeter Output Level: There is a jumper pad located on the crossover circuit board that allows you to select full output level (0dB) or attenuated (-3dB or -6dB) tweeter operation. This allows you to match the tweeter output level with the woofer output level for balanced response. Typically, when the tweeter and woofer are mounted so they are about the same distance from your ears, the jumper is left in the 0dB position. When the tweeter location is much closer to your ears than the woofer location, the jumper should be set to the -3dB or -6dB position.

Tweeter Phase Switch: This 0-degree/180-degree switch allows easy comparison of tweeter phase without the need to disconnect speaker wires. The switch should be set in the position that produces the best response.

Inputs/Outputs: The crossover inputs and outputs are gold-plated screw terminals.

Mounting: There are 3 mounting holes in the base of each crossover.

Crossover Dimensions: W=5.596", H=1.458", D=5.227"

Specification Note

Sensitivity: The manual lists separate sensitivity specs for the woofer (92dB) and tweeter (90dB). The sensitivity figure listed in the Crutchfield database is the average of the two individual sensitivity specifications. The average sensitivity (91dB) is given because it more accurately represents the overall sensitivity of the system; this permits a better estimation of the power needed for clean, high volume output.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.