Connecting Your Subwoofer to Your Amplifier J BL GT Series

JBL GT Series subwoofers are available in two different configurations: as a single 4-ohm voice coil or as dual 4-ohm voice coils. Depending on the amplifiers you are using, you may use either single-voice coil or dual-voice coil subwoofers in singles or multiples to maximize the power available from your amplifiers. To achieve the maximum amplifier output possible, you should design a speaker system that provides the lowest impedance that

your amplifier is rated to drive safely. When designing a subwoofer system, consider the following rules:

1.Don’t mix different subwoofer or enclosure types in the same system (use all single-coil woofers or all dual-coil woofers).

2.You may connect the coils of a dual-voice coil woofer in series, but we recommend that you avoid connecting separate woofers in series. The amplifier- damping factor (the amplifier’s ability to control the motion of the woofer) is expressed as a ratio of terminal impedance (the sum of speaker impedance, wire resistance and the D.C. resistance of any crossover coil connected to the woofer) to amplifier-output impedance. Therefore, connecting separate woofers in series reduces the damping factor of the amplifier to a value less than 1. This will result in poor transient response.

3.You must use both coils of a dual-voice coil woofer connected either in series or in parallel.

4.Most amplifiers deliver exactly the same amount of power bridged into a 4-ohm load

as they do running a 2-ohm stereo load.

To design a subwoofer system that maximizes available amplifier power, keep the following rules in mind:

1.The total system impedance of woofers in parallel can be calculated using the formula:

1

Impedance = 1 + 1 + 1 . . .

w1 w2 w3

where w is the nominal impedance of the woofer.

2.The total system impedance of voice coils (or woofers) in series can be calculated using the formula:

Impedance = w1 + w2 + w3 . . .

The diagrams at right show parallel and series speaker connections.

Figure 1. Parallel connection

RED￿

BLACK￿

STRIPE￿

STRIPE￿

POS ( + )

NEG ( – )

POS ( + )

 

 

NEG ( – )

Figure 2. Series connection

RED￿ BLACK￿

STRIPE￿ STRIPE￿

POS ( + ) NEG ( – )

POS ( + )NEG ( – )

03

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JBL GT150D, GT100D, GT120D Connecting Your Subwoofer to Your Amplifier J BL GT Series, Parallel connection
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GT150, GT100D, GT120, GT150D, GT120D specifications

The JBL GT series is known for delivering high-quality audio performance at an affordable price, making it popular among car audio enthusiasts. The series includes models such as GT100, GT120D, GT150D, GT120, and GT100D, each offering unique features and technologies tailored for superior sound experiences.

The JBL GT100 is a versatile 10-inch subwoofer designed to enhance bass response in car audio systems. With a peak power handling of 1000 watts, it delivers deep, powerful bass while maintaining clarity. Its advanced injection-molded cone provides durability and excellent sound reproduction, resulting in bass that is both punchy and well-defined.

Next in the lineup is the GT120D, a 12-inch dual voice coil subwoofer. This model is engineered for deeper bass and higher power handling capabilities, with peak power of 1200 watts. The GT120D features a rugged rubber surround that enhances its longevity and performance efficiency, ensuring that it remains reliable even under intense conditions. Its dual voice coil design allows flexibility in wiring configurations, making it an excellent choice for custom installations.

The GT150D takes performance a notch higher with its 15-inch diameter, targeting users who crave serious bass. With an impressive peak power handling of 1500 watts, it is built for maximum impact without compromising sound quality. The model benefits from a reinforced steel basket that minimizes distortion, allowing users to enjoy clear audio even at high volumes.

For those seeking a balanced option, the GT120 subwoofer offers a blend of size and performance, featuring a 12-inch cone with a peak power of 1200 watts. Its high-temperature voice coil improves heat dissipation, enhancing overall performance during prolonged play. This model combines efficiency with powerful output, making it perfect for both casual listeners and serious audiophiles alike.

Lastly, the GT100D is designed for those who desire flexibility in their audio system. With a single 10-inch driver and dual voice coil technology, it allows for versatile wiring options while ensuring solid bass response. Its engineering focuses on durability and performance, making it suitable for various vehicle types and audio configurations.

Overall, the JBL GT series subwoofers exemplify JBL's commitment to quality and innovation, providing audiophiles with a range of options that cater to different preferences and setups, all while ensuring a rich listening experience.
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