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JBL GTO Series 4"x6" / 4"x6"m Speakers


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Item # 109GTO6420

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Our take on the JBL GTO Series 4"x6" / 4"x6"m Speakers

JBL's GTO6420 4"x6"/4"x6"m speakers are designed to fit both U.S. standard and metric 4"x6" openings. The Rigitex™ woofer cone is constructed of ribbed polypropylene for increased rigidity. A rubber surround tightens up the low frequencies and extends speaker life. The 1-1/2" titanium-composite cone tweeter delivers remarkable highs. JBL does it again! Grilles are not included.

  • poly woofer cone with rubber surround
  • 1-1/2" titanium-composite cone tweeter
  • sensitivity 92 dB
  • frequency response 75-21,000 Hz
  • recommended power range 5-25 watts RMS
  • peak power handling 60 watts
  • top-mount depth 1-13/16"

Priced per pair

What's in the Box:

  • 2 Two-way speakers
  • 2 Metric-to-standard adapter plates
  • 8 Screws (screws only for attaching adapter plates to speaker)
  • Manual with specifications (English)
  • Cutout template
  • NOTE: No grilles
  • mounting screws or speaker wire included!
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Features and Specs

Design 2-way
Tweeter Design Cone
Tweeter Composition Titanium composite
Woofer Composition Rigitex Poly
Woofer Surround Rubber
Parts Warranty 1 YEAR
Labor Warranty 1 YEAR
Sensitivity 92 dB at 1 watt
Frequency Response 75 - 21k Hz
RMS Power Range (Watts) 5-25
Peak Power Handling (Watts) 60
Impedance (Ohms) 4
Top-mount Depth (Inches) 1 13/16
Bottom-mount Depth (Inches) 1 7/8

Product Research

Special Features

Warning: The manual mentions a warranty registration card, but JBL did not include cards with many of the speakers. The card does not need to be returned for warranty coverage. All that is needed for warranty coverage is a dated receipt on which the model purchased is shown. Crutchfield has not been supplied with copies of the warranty registration card.

Power Handling Specifications: The specification shown in the manual as the upper limit of the "Recommended Amplifier Power Range" is incorrectly listed as RMS power. The upper limit of the recommended amplifier power range is actually the peak power handling of the speaker. The power specifications under the Specs/Features tab were provided by JBL..

Woofer cone: The woofer is made with rigitex. Rigitex is a poly material molded with ribs to help increase the cone's resistance to flexing.

Tweeter:  The speaker uses a 1-1/2" Titanium-Composite Cone Tweeter.

Mounting: This speaker may be mounted in metric (4"x6"m) and US standard size 4"x 6" applications. A metal adapter plate is included for US standard 4"x6" mounting.

Metric Mounting Dimensions:

  • Top Mount Depth = 1.806"
  • Top Mount Mounting Height = 0.414"
  • Top Mount Flange Height  = 0.032"
  • Bottom Mount Depth = 1.838"
  • Bottom Mount Tweeter Protrusion = 0.382"
  • Major Apex of Oval = 6.093"
  • Minor Apex of Oval = 3.726"
  • Frame Width = 3.741"
  • Frame Length = 6.104"
  • Bolt Pattern:
    • Number of Holes:  4
    • Minor Axis 1 =  2.85"
    • Minor Axis 2 =  2.9"
    • Major Axis 1=  4.825"
    • Major Axis 2 = 4.9"

Note: Grilles, mounting screws or speaker wire are not included.

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.