Connecting Your Subwoofer to Your Amplifier JBL GT4 Series

JBL GT4 Series subwoofers are single 4-ohm voice coil. Depending on the amplifiers you are using, you may want to use either one or sev- eral subwoofers in the same enclo- sure to maximize the power avail- able from your amplifiers. To achieve the maximum amplifier output possi- ble, 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.

2.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.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 woofers in series can be calcu- lated 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 ( – )

 

2

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JBL GT4-10, GT4-15, GT4-12 owner manual Connecting Your Subwoofer to Your Amplifier JBL GT4 Series, Parallel connection
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GT4-10, GT4, GT4-15, GT4-12 specifications

JBL, a renowned name in the world of audio equipment, offers a range of high-performance subwoofers designed to deliver deep, powerful bass for audio enthusiasts and casual listeners alike. Among their impressive line-up are the JBL GT4-12, GT4-15, GT4, and GT4-10 subwoofers. Each model boasts unique features and technologies, making them suitable for various listening preferences and environments.

The JBL GT4-12 is a 12-inch subwoofer that excels in producing rich bass tones with minimal distortion. It features a robust polypropylene cone, which provides durability and decreases unwanted resonance, ensuring that the bass remains tight and controlled. The subwoofer is designed with a high-temperature voice coil, which enhances its ability to handle high power levels without overheating. Additionally, the GT4-12 incorporates a strong rubber surround, allowing for greater cone movement and a more dynamic sound experience.

Next in the lineup is the JBL GT4-15, a 15-inch subwoofer that takes bass performance to another level. With its larger cone area, the GT4-15 generates deeper bass and a higher sound pressure level. This model is also engineered with a high-quality polycarbonate structure and a powerful magnet assembly, contributing to its excellent sound reproduction capabilities. The GT4-15 is perfect for those who seek that earth-shaking low-end response, making it ideal for both car audio systems and home theater setups.

The JBL GT4 series includes the GT4 model, which is recognized for its all-around performance. It provides a well-balanced sound profile, making it versatile for various genres of music. The GT4 features a sturdy construction and an efficient design, ensuring that it can deliver powerful bass without sacrificing clarity. Its lightweight design makes it easy to install and integrate into different audio systems.

Lastly, the JBL GT4-10 is a compact 10-inch subwoofer that offers a great solution for those with limited space. Despite its smaller size, the GT4-10 doesn't compromise on performance. It features advanced damping technologies that help reduce distortion, allowing for cleaner sound reproduction. This subwoofer is ideal for users looking for a powerful bass experience in tighter spaces, such as smaller vehicles or home audio systems.

In conclusion, the JBL GT4 series, including the GT4-12, GT4-15, GT4, and GT4-10, provides audio enthusiasts with a variety of subwoofer options that cater to different power requirements and space constraints. With advanced technologies and a focus on delivering high-quality sound, JBL continues to uphold its reputation for excellence in audio performance. Whether used for automotive applications or home theater setups, the GT4 subwoofers deliver the deep, impactful bass that many listeners crave.
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