105-Watt, Two-Way 4" Speaker System

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Imagine car audio so full of big boom, soundstage and detail, you’ll want to flick your rear view mirror just to see what your passengers in the back think. The JBL® GTO428 includes JBL® engineering triumphs like a Plus One® woofer cone, a My-Ti™ tweeter and a Unipivot™ rotating tweeter mount. Have a superior ride, just like that.

Item# GTO428

General Specifications

Size 4"
Series Grand Touring
Type Two-Way

Audio Specifications

Nominal Impedance 2 ohms
Sensitivity (2.83V@1m) 90dB
Frequency Response 65Hz–21kHz
Power Handling (Peak) 105W
Power Handling (RMS) 35W

Speaker Specifications

Crossover Frequencies Onboard
Controls/Adjustments None
High-Frequency Transducer 25mm (1") balanced-dome My-Ti™ dome
Low-Frequency Transducer PlusOne® HCL™ honeycomb-laminate cone


Mounting Depth (mm) 51
External Diameter (in) 3-15/16
Mounting Depth (in) 2
Mounting Cutout Diameter (in) 3-1/2
Mounting Cutout Diameter (mm) 89
External Diameter (mm) 100
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  • (2) GTO428 4” two-way loudspeakers
  • (1) Owner's Manual

The latest owner's manuals, quick start guides, and documents.

1 Year Warranty

Products purchased online or from an authorized local retailer and under warranty may qualify for an exchange with a valid receipt.

Purchases made from an unauthorized dealer will not be eligible for exchange.

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