GT4-15 - Subwoofer JBL - Free user manual and instructions
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| Type | Car Audio Subwoofer |
| Brand | JBL |
| Model | GT4-15 |
| Diameter | 15 inches |
| Impedance | 4 ohms |
| Power Handling (RMS) | 500 Watts |
| Peak Power Handling | 1000 Watts |
| Sensitivity | 90 dB |
| Frequency Response | 28 Hz - 200 Hz |
| Mounting Depth | 6.5 inches |
| Recommended Enclosure | Sealed or Ported |
| Weight | 21 lbs (9.5 kg) |
| Dimensions (Diameter x Depth) | 15 x 7 inches |
| Cone Material | Polypropylene |
| Surround Material | Rubber |
| Voice Coil | 2 inches |
| Magnet Type | Ferrite |
| Terminal Type | Spring-loaded |
| Cleaning | Wipe with a dry cloth; avoid liquids |
| Safety | Disconnect power before installation; ensure proper ventilation |
| Spare Parts / Reparability | Contact JBL support for authorized service; professional installation recommended |
Frequently Asked Questions - GT4-15 JBL
What is the recommended enclosure volume for the JBL GT4-15?
For a sealed enclosure, use 1.5-2.0 cubic feet; for ported enclosure, use 2.5-3.0 cubic feet tuned to 35 Hz.
Can I use the GT4-15 with a factory radio?
Yes, but you need an external amplifier with sufficient power (400-600W RMS at 4 ohms). Factory radios lack the power to drive it properly.
What is the impedance of the GT4-15?
The subwoofer has a single 4 ohm voice coil.
How do I wire the GT4-15 in a system?
Connect the positive terminal to the amplifier's positive output and the negative terminal to the amplifier's negative output. Ensure the amplifier is stable at 4 ohms.
What is the maximum power handling of the GT4-15?
Peak power handling is 1000 Watts, but RMS (continuous) is 500 Watts. Use an amplifier rated 400-600W RMS for optimal performance.
Can I install the GT4-15 in a truck?
Yes, but the mounting depth of 6.5 inches requires sufficient space. Check clearance behind the seat or build a custom enclosure.
Does the GT4-15 require a break-in period?
A break-in period of 10-20 hours at moderate volume is recommended to loosen the suspension for better bass response.
What is the frequency response range?
The subwoofer plays frequencies from 28 Hz to 200 Hz, ideal for deep bass in car audio systems.
How do I clean the GT4-15?
Use a dry cloth to gently wipe the cone and surround. Avoid water or cleaning chemicals as they may damage the materials.
What is the warranty for the JBL GT4-15?
JBL typically offers a 1-year warranty from the date of purchase. Register your product for support; contact JBL customer service for claim details.
User questions about GT4-15 JBL
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Download the instructions for your Subwoofer in PDF format for free! Find your manual GT4-15 - JBL and take your electronic device back in hand. On this page are published all the documents necessary for the use of your device. GT4-15 by JBL.
USER MANUAL GT4-15 JBL
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Product information
Brand : JBL
Model : GT4-15
Category : Subwoofer