Introduction
The JBL GTO939 speakers are part of the Grand Touring Series, designed to deliver high-quality audio performance in a vehicle environment. These 6" x 9" 3-way coaxial speakers feature advanced technology for clear sound reproduction and robust bass. This manual provides essential information for the proper installation, operation, and care of your JBL GTO939 speakers.
What's in the Box
- 1 x Subwoofer (Note: This product is a pair of coaxial speakers, but the included components list specifies '1 x Subwoofer'.)
Product Features
- 6 x 9-inch three-way loudspeaker pair.
- Plus One woofer cone with rubber surround for increased cone surface area and improved bass response.
- Adjustable Mylar-titanium tweeter and supertweeter with level control for optimized sound.
- 300 Watts peak power handling per speaker; 2 ohm impedance for efficient power utilization.
- Three-inch mounting depth for versatile installation.
- Built-in crossover networks with advanced high and low pass filters for smooth transition between woofer and tweeter.
Setup
Proper installation is crucial for optimal performance and safety. If you are unsure about any steps, it is recommended to seek professional installation.
Installation Steps:
- Disconnect Battery: Before beginning any electrical work, disconnect the vehicle's negative battery terminal to prevent electrical shorts.
- Remove Existing Speakers: Carefully remove the existing speakers from their mounting locations, typically in the door panels or rear deck. Refer to your vehicle's service manual for specific instructions.
- Prepare Mounting Location: Ensure the mounting location is clean and free of obstructions. The JBL GTO939 speakers are designed to fit most factory 6x9 locations.
- Connect Wiring: Connect the speaker wires to the corresponding terminals on the JBL GTO939 speakers. Ensure correct polarity (positive to positive, negative to negative) to avoid phase issues.
- Mount Speakers: Securely mount the new speakers using the provided hardware. Do not overtighten screws.
- Test Functionality: Before reassembling the interior, reconnect the battery and test the speakers. Ensure all speakers are producing sound and that the sound is clear and balanced.
- Reassemble Interior: Once satisfied with the sound, carefully reassemble the vehicle's interior components.
Operating
Once installed, your JBL GTO939 speakers will enhance your vehicle's audio experience. Here are some general operating guidelines:
- Volume Control: Adjust the volume to a comfortable listening level. Avoid excessively high volumes for prolonged periods to prevent hearing damage and speaker distortion.
- Equalizer Settings: Experiment with your head unit's equalizer (EQ) settings to tailor the sound to your preference. Start with a flat EQ and make small adjustments to bass, midrange, and treble.
- Crossover Adjustment: The built-in crossover networks optimize sound delivery. If your head unit or amplifier has adjustable crossover settings, ensure they are set appropriately for full-range speakers to prevent damage from extreme low frequencies.
- Listen for Distortion: If you hear any distortion, crackling, or buzzing, immediately reduce the volume. Distortion can damage speakers.
Maintenance
Regular maintenance helps prolong the life and performance of your JBL GTO939 speakers.
- Cleaning: Use a soft, dry cloth to gently wipe down the speaker grilles and surrounds. Avoid using harsh chemicals or abrasive cleaners.
- Environmental Factors: Protect speakers from direct sunlight and extreme temperatures when possible, as prolonged exposure can degrade materials.
- Inspect Connections: Periodically check speaker wire connections to ensure they are secure and free from corrosion.
- Avoid Overpowering: Ensure your amplifier's power output does not exceed the speakers' RMS power handling to prevent damage.
Troubleshooting
If you encounter issues with your JBL GTO939 speakers, try the following troubleshooting steps:
No Sound:
- Check all wiring connections at the speaker, head unit, and amplifier (if applicable).
- Verify that the head unit is powered on and set to the correct audio source.
- Ensure the amplifier (if applicable) is receiving power and is not in protection mode.
Distorted Sound:
- Reduce the volume level. Distortion often occurs when the speakers are overdriven.
- Check your head unit's EQ settings. Excessive bass or treble boost can cause distortion.
- Inspect speaker cones and surrounds for any physical damage.
Weak or No Bass:
- Verify speaker polarity. Incorrect wiring (positive to negative) can cause bass cancellation.
- Check your head unit's bass and subwoofer level settings.
- Ensure speakers are securely mounted and sealed in their enclosures to prevent air leaks.
Specifications
| Specification | Value |
|---|---|
| Speaker Type | Coaxial, Woofer |
| Speaker Size | 9 Inches |
| Peak Power Handling (per speaker) | 300 Watts |
| RMS Power Handling (per speaker) | 100 Watts |
| Frequency Response | 45-21,000 Hz |
| Impedance | 2 ohms |
| Sensitivity | 94 dB |
| Mounting Depth | 3 Inches |
| Item Weight | 4.4 pounds |
| Manufacturer | Harman Kardon |
Product Media
Image: A pair of JBL GTO939 6x9 inch coaxial speakers, shown with their protective grilles installed. The speakers feature a black finish with silver accents around the cone and tweeter.
Image: A single JBL GTO939 6x9 inch coaxial speaker, displayed without its grille. The image highlights the speaker's cone and the central tweeter/midrange assembly.
Image: An angled view of the JBL GTO939 6x9 inch coaxial speaker with its grille. This perspective provides a better look at the speaker's depth and the design of the grille.
Image: A close-up view of the central tweeter and midrange assembly of the JBL GTO939 speaker. This detailed shot shows the Mylar-titanium composite dome and its protective mesh.
Image: A side view of the JBL GTO939 6x9 inch coaxial speaker, illustrating its mounting depth and the structure of the speaker basket.
Official Product Videos
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Warranty and Support
Warranty: The JBL GTO939 speakers come with a 1-year limited warranty from the manufacturer, Harman Kardon. Please retain your proof of purchase for warranty claims.
User Guide: For a comprehensive user guide in PDF format, please refer to the official document: JBL GTO939 User Guide (PDF)
Additional Support: For more information or to explore other JBL products, visit the official JBL Store: JBL Store on Amazon