GRAND TOURING GTO 508C Refurbished

5 1/4 inch Component System

$139.99139.99 per system
$199.95 Save 30%
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Patented Plus One® woofer cones

Patented Plus One® woofer cones

The JBL-only woofer cone, the Plus One® (patent no. 7,548,631 B2) is exceptionally stiff, lightweight, and has up to 25 percent more active surface area than you’ll ever find on competing models of the same size. You get an audible increase in bass output and efficiency.

Computer-optimized outboard component crossover network

Computer-optimized outboard component crossover network

The GTO508C has a voice-matched outboard component crossover network to ensure optimum transition from the midwoofer to the midrange speaker and the tweeter. You get realistic, hear-every-detail sound.

Increased power handling with My-Ti™ tweeters

Increased power handling with My-Ti™ tweeters

My-Ti™ tweeters deliver increased power handling, reduced distortion and increased efficiency. A Mylar®/titanium composite dome makes way for open, smooth spacious sound and a seamless transition between the middle and high frequencies.

Accurate frequency response

Accurate frequency response

With a frequency response of 65Hz to 21kHz, the GTO508C reproduces powerful, teeth-rattling bass tones and the highest highs without distortion.

JBL I-Mount™ for easy installation

JBL I-Mount™ for easy installation

I-Mount™ (patent no. 5,859,917) allows for more precise imaging and simplifies tweeter installation with angle-, surface- or flush-mount options. It’s a tweeter mounting system that makes for one of the easiest and most versatile installations you’ve ever done.

Outstanding audio output

Outstanding audio output

This speaker system offers 55 watts RMS and 165 watts of peak power handling and 91dB sensitivity. Hit the gas and have fun.

True  4 Ohm Technology

True 4 Ohm Technology

Low-Impedance, three ohm voice coils compensate for the undergauged speaker wiring found in many of today's cars, and make the most of every watt your amplifier or head unit can deliver.

GRAND TOURING GTO 508C - Black - 5 1/4 inch Component System - Hero

Specs & Downloads

General Specifications

Series Grand Touring
Size 5-1/4"
Type Two-Way
MSRP U.S. $229.95 per pair

Audio Specifications

Power Handling (Peak) 165W
Nominal Impedance 2 ohms
Sensitivity (2.83V@1m) 91dB
Frequency Response 65Hz–21kHz
Power Handling (RMS) 55W

Speaker Specifications

Controls/Adjustments HF cut
Crossover Frequencies Outboard
Low-Frequency Transducer PlusOne® HCL™ honeycomb-laiminate cone
High-Frequency Transducer 25mm (1") edge-driven My-Ti™ dome, pivoting


Mounting Depth Tweeter (mm) 17
Mounting Depth Tweeter (in) 11/16
External Diameter Woofer (in) 5-1/8
External Diameter Tweeter (in) 2
Mounting Depth Woofer (mm) 57
Mounting Cutout Diameter Woofer (mm) 120
Mounting Cutout Diameter Tweeter (in) 1-7/8
Mounting Cutout Diameter Tweeter (mm) 47
External Diameter Tweeter (mm) 50
Mounting Depth Woofer (in) 2-1/4
External Diameter Woofer (mm) 130
Mounting Cutout Diameter Woofer (in) 4-3/4

What's in the box?

  • (2) GTO508C Midwoofers
  • (2) Tweeter brackets
  • (2) Caps screws for tweeter brackets
  • (2) Additional alternate tweeter encasements
  • (2) Additional alternate tweeter brackets
  • (2) Additional alternante bracket cap
  • (1) Owner's Manual
  • (2) Grilles
  • (2) Crossover units
  • (12) Screw clips
  • (2) Tweeters
  • (2) Small clip screws
  • (26) Screws
  • (2) Sets of speaker wire
  • (2) Tweeter encasements

Documents & Downloads

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

Reviews and Q&A

Customer Reviews

Product Q&A


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