JBL GTiAutomotive Welcome to Club GTi, Autosound at its Best, Unleash Maximum Performance

Welcome to Club GTi

Thank you for purchasing one of the finest automotive subwoofers that JBL has ever pro- duced. As a GTi competition series owner, you are a member of a select group of people who enjoy the most advanced mobile audio products avail- able. We call this group “Club GTi.” By sending in the customer information card, that you will find packaged with this product, we will automatically register you as a Club GTi member which will give you access to exclusive Club GTi apparel and other special offers we will make available from time to time. We suggest you fill the card out at your earliest convenience.

Also, be sure to save your sales receipt in a safe place. It will be necessary to use this docu- ment as proof of purchase should you need war- ranty service.

Autosound at its Best

The GTi Subwoofer is built to meet the same rigorous standards of construction and perfor- mance that have long established JBL’s renowned home and professional speaker systems. The GTi Subwoofer achieves its exceptional performance with leading edge technologies that push the per- formance envelope in automotive sound.

The exceptional sound of the GTi Subwoofer comes from an Aquaplas coated fiber cone for extra stiffness and resonance elimination. The

cone motion is controlled by a synthetic rip-stop suspension which resists tearing for safe, effortless high-power use. The cone is driven by a massive motor structure utilizing a 3" or 4" edge-wound OFC copper wire, high temperature fiberglass, voice coil. This motor structure includes JBL’s patented Symmetrical Field Geometry (SFG) to create a uniform magnetic flux field through the coil and thus lower distortion. The frame and cone are contained in a high strength die-cast aluminum frame for maximum rigidity and higher magnetic energy concentration on the coil.

What does all this technology add up to? A driver with smooth frequency response, excellent transient response, high output efficiency and high power handling in a rugged package able to deal with the rigors of high performance car audio. The result is exceptionally powerful, dynamic and accu- rate sound reproduction that cuts through the road noise and provides a solid musical foundation.

Unleash Maximum Performance

Because this is a high performance product which may be used in many different configura- tions, we strongly recommend that you have the subwoofer professionally installed to unleash its full performance potential. However, if you feel you have the skills necessary to build a subwoofer box, read the following information on enclosures before proceeding.

Enclosure Basics

The enclosure you build plays a profound role in the performance of your subwoofer. The size and vent tuning frequency, where applicable, determine the low-frequency performance and output capability of the subwoofer system. Your GTi subwoofer will pro- vide excellent performance when used in Sealed, Vented, Infinite Baffle, and Band-pass applications that are properly designed. Each of these applications have limits and advantages that should be considered.

GTi woofers are most commonly used either in Vented enclosures or Infinite Baffle. Instructions which follow will give you a simplified design method to build a Vented enclosure for your subwoofer. Another option is the Infinite Baffle (free air) installation which doesn’t require complex design and construction, and can sound very good when solidly installed. However, because there is no enclosure to control cone motion, the power handling and maximum output level of an Infinite Baffle installation is reduced from that of a Vented enclosure. Refer to the “Points on Power Handling” section for more information.

For more complex designs, such as single and dual-vented Band-pass types, we suggest you opti- mize your design with JBL SpeakerShop, a speaker system design software for a P.C. running Microsoft Windows, available from your JBL dealer. If JBL SpeakerShop or a similar program is not available, the JBL Customer Service department will be happy to assist you.

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