Grand Touring GT650T - Subwoofer JBL - Free user manual and instructions
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| Product Type | Car Subwoofer |
| Brand | JBL |
| Model | Grand Touring GT650T |
| Woofer Size | 6.5 inches (165 mm) |
| Power Handling (RMS) | 300 Watts |
| Power Handling (Peak) | 600 Watts |
| Impedance | 4 Ohms |
| Sensitivity | 91 dB (1W/1m) |
| Frequency Response | 35 Hz - 200 Hz |
| Mounting Depth | 4.5 inches (114 mm) |
| Mounting Cutout Diameter | 5.5 inches (140 mm) |
| Voice Coil | Single 2-layer |
| Cone Material | Polypropylene with rubber surround |
| Woofer Diameter | 6.5 inches (165 mm) |
| Overall Dimensions (H x W x D) | 7.0 x 7.0 x 5.2 inches |
| Weight | 5.5 lbs (2.5 kg) |
| Recommended Enclosure Volume (Sealed) | 0.35 cubic feet (10 liters) |
| Recommended Enclosure Volume (Ported) | 0.55 cubic feet (16 liters) |
| Port Diameter (if ported) | 2 inches (50 mm) |
| Port Length (if ported) | 8 inches (203 mm) |
| Material | Steel basket, foam surround |
| Connection Type | Push terminals (positive/negative) |
| Recommended Amplifier Power | 200 - 500 Watts RMS |
| Maintenance | Clean with a soft dry cloth; avoid liquids |
| Safety | Ensure proper ventilation; do not exceed rated power |
Frequently Asked Questions - Grand Touring GT650T JBL
What is the difference between RMS and peak power handling for the GT650T?
RMS (Root Mean Square) power handling indicates the continuous power the subwoofer can handle safely, which is 300 Watts. Peak power handling is the maximum short burst power, rated at 600 Watts. Always match your amplifier's RMS output to the sub's RMS rating for best performance.
What impedance does the JBL GT650T have?
The GT650T has a 4 Ohm impedance. This is a standard impedance for car subwoofers, allowing compatibility with most amplifiers in either stereo or bridged configurations.
What size enclosure do I need for the GT650T?
For a sealed enclosure, JBL recommends 0.35 cu ft (10 liters). For a ported enclosure, use 0.55 cu ft (16 liters) with a 2-inch diameter port 8 inches long for best bass response.
Can I use the GT650T in a free-air (infinite baffle) setup?
No, the GT650T is designed for enclosed use only. Using it in free-air can damage the suspension and reduce sound quality. Always use a sealed or ported enclosure.
What is the mounting depth of the GT650T?
The mounting depth is 4.5 inches (114 mm). Ensure your enclosure has sufficient depth for the magnet structure without touching the back.
How do I clean the subwoofer?
Clean the cone and surround with a soft, dry cloth. Avoid using liquids or cleaners, as they can damage the materials. Keep the terminals dry and free from corrosion.
What amplifier power is recommended?
Amp power of 200-500 Watts RMS into 4 ohms is recommended. This ensures the subwoofer receives enough power without overdriving. Adjust gain settings properly to avoid distortion.
Is the GT650T compatible with a factory head unit?
Yes, but you will need an amplifier. Factory head units typically provide low power (10-20 Watts), insufficient to drive the subwoofer. Use an external amplifier with a line output converter if the head unit lacks RCA outputs.
What is the sensitivity rating?
Sensitivity is 91 dB (1W/1m). This means with 1 watt of power, the subwoofer produces 91 dB of sound at 1 meter distance. Higher sensitivity equals greater efficiency.
How do I wire the subwoofer to my amplifier?
Connect the positive terminal on the sub to the positive channel on the amp, and negative to negative. If using two subwoofers, wire them in parallel for a 2 Ohm total load (if amp stable) or series for 8 Ohms. Always check amp impedance ratings.
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USER MANUAL Grand Touring GT650T JBL
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Product information
Brand : JBL
Model : Grand Touring GT650T
Category : Subwoofer