Thank you for choosing a JBL GT Series subwoofer. GT Series subwoofers are designed to suit a broad range of mobile audio applications and can be used in a wide variety of enclo- sure types to produce extended, powerful bass in a limited amount of vehicle space. To ensure maximum subwoofer performance, we strongly rec- ommend that installation be left to a qualified professional. Although these instructions explain how to install a GT Series subwoofer in a general sense, they do not show box con- struction details and exact

installation methods for your par- ticular vehicle. If you do not feel you have experience, do not attempt the installation yourself, but instead ask your authorized JBL dealer about professional installation options.

Remember to keep your sales receipt with this manual in a safe place so both are available for future reference.

Your Car and Bass

Reproduction

Depending on the size of the vehi- cle’s interior listening space, reproduced bass frequencies below 80Hz are actually boosted by nearly 12dB per octave as fre- quency decreases. NOTE: This effect, known as the vehicle’s transfer function, plays an impor- tant part in shaping the overall in-car response and is displayed graphically along with freespace response on the enclosed data sheet for your GT Subwoofer.

Enclosure Calculations and Building Boxes

Use the recommended box designs on the enclosed data sheet or look for them on our Web site at www.jbl.com. Choose cabinet dimensions to fit your vehicle, but do not change the enclosure’s volume. Doing so will change the tuning frequency of the enclosure and may adversely affect final performance. If you cannot perform the necessary calculations yourself, please con- tact your authorized JBL dealer for help and information about JBL Speakershop™, a dedicated enclosure-design software pro- gram for experienced car-audio enthusiasts.

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JBL GT1000d, GT800d, GT1500d, GT1200d Your Car and Bass Reproduction, Enclosure Calculations and Building Boxes

GT1000d, GT800d, GT800, GT1200, GT1200d specifications

JBL is a renowned name in the audio industry, well known for its high-quality speakers and subwoofers. Among their impressive lineup, the JBL GT series, including the GT1000, GT1500D, GT1200D, GT1200, and GT800, stands out for their powerful performance and innovative features catering to car audio enthusiasts.

The JBL GT1000 is designed to provide robust bass response and clarity. It employs a polypropylene cone that ensures durability while delivering crisp sound quality. With its high power handling, the GT1000 can produce deep bass without distortion, making it a popular choice among car audio lovers. Its compact design allows for flexible installation options in various vehicle types.

Moving on to the JBL GT1500D, this model stands out with its dual voice coil design, which enhances its versatility in wiring configurations. Capable of generating a significant amount of power, the GT1500D employs advanced technology to ensure efficient energy conversion, resulting in powerful, clear bass that can elevate any car audio experience. The incorporation of a built-in low-pass filter allows users to customize their sound profile easily.

The JBL GT1200D is another powerful option in this series, featuring a lightweight yet sturdy construction that aids in its performance. This model is engineered with a vented pole piece to enhance airflow and reduce overheating during prolonged use, ensuring longevity and reliability. The GT1200D's optimized frequency response allows for truly immersive sound quality.

Next in the lineup is the JBL GT1200, which is tailored for users seeking good bass without sacrificing space in their vehicle. It combines a sleek design with an efficient motor structure, delivering impressive low-frequency response while maintaining clarity in the higher frequencies. This makes it ideal for a balanced sound output, whether it be pop, rock, or hip-hop.

Lastly, the JBL GT800 is an entry-level subwoofer that provides exceptional value for those looking to upgrade their car audio system without breaking the bank. Despite its smaller size, the GT800 still packs a punch, delivering solid bass response. Its robust build quality ensures it can withstand the rigors of vehicle use while still performing at a high level.

Overall, the JBL GT series offers a variety of options, delivering powerful sound performance suited for any listener's needs, thanks to their innovative technology and high-quality materials used in construction. Whether seeking deep bass or balanced sound, these models are designed to enhance any car audio experience.