User manual JBL GTO804

[. . . ] We recommend listening at low levels while driving. JBL accepts no liability for hearing loss, bodily injury or property damage resulting from use or misuse of this product. Grand Touring Series subwoofers are optimized to perform best in small, sealed, vented and prefabricated bandpass enclosures. [. . . ] Because vented enclosures require the volume of the enclosure and the size of the port to have a specific relationship with the characteristics of the woofer, the enclosure must be built exactly to the specifications provided. While there are some prefabricated vented boxes available, matching a prefabricated box to a particular woofer is difficult. If you wish to use a vented enclosure, we strongly recommend having your authorized JBL dealer build it or verify that your design is correct if you wish to build it yourself. An optimum vented enclosure is always larger than the optimum sealed box for the same woofer and will require more space inside the vehicle. Bandpass enclosures often provide the most output available from any amplifier and subwoofer combination at the expense of sonic accuracy. If sheer SPL (sound-pressure level) is what you desire most, choose a bandpass enclosure. Bandpassenclosure design is very tricky and the aid of a computer and enclosure design software is necessary. If you are an experienced installer or have some woodworking experience, you may wish to build the bandpass enclosure described in the enclosure design sheet included with this woofer. Fortunately, there are many prefabricated bandpass boxes available and they are all optimized to extract the most output possible from any woofer. Bandpass enclosures can be quite large and may require a lot of space inside your vehicle. 2 CONNECTING YOUR SUBWOOFER TO YOUR AMPLIFIER JBL Grand Touring Series subwoofers are available in two different configurations: as dual 4-ohm voice coils or as dual 2-ohm voice coils. Depending on the amplifiers you are using, you may use GTO 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 will drive safely. When designing a subwoofer system, consider the following rules: 1. Do not mix different subwoofers or enclosure types in the same system. Subwoofers being used in the same enclosure or powered from the same amplifier should be identical models. Mismatched woofers and enclosures can result in poor performance from your subwoofer system. [. . . ] NOTE: The GTO1002D, GTO1202D and GTO1502D come with one jumper installed for a series configuration. NOTE: The GTO1004D, GTO1204D and GTO1504D come with both jumpers installed for a parallel configuration. Parallel connection 3 SPECIFICATIONS GTO804 8" Single 4-Ohm Subwoofer Power Handling, RMS Power Handling, Peak Sensitivity (2. 83V/1m) Frequency Response Impedance Mounting Depth Cutout Diameter Overall Diameter 200W 800W 91dB 30Hz ­ 400Hz 4 Ohms 4-3/8" (112mm) 7-1/16" (180mm) 8-1/4" (210mm) GTO1002D 10" Dual 2-Ohm Subwoofer 250W 1000W 91dB 25Hz ­ 400Hz 4 Ohms/1 Ohm 4-9/16" (116mm) 9-3/16" (234mm) 10-3/8" (264mm) GTO1004D 10" Dual 4-Ohm Subwoofer 250W 1000W 91dB 25Hz ­ 400Hz 8 Ohms/2 Ohms 4-9/16" (116mm) 9-3/16" (234mm) 10-3/8" (264mm) GTO1202D 12" Dual 2-Ohm Subwoofer 300W 1200W 93dB 23Hz ­ 400Hz 4 Ohms/1 Ohm 5-1/16" (129mm) 11-3/16" (285mm) 12-7/16" (316mm) GTO1204D 12" Dual 4-Ohm Subwoofer 300W 1200W 93dB 23Hz ­ 400Hz 8 Ohms/2 Ohms 5-1/16" (129mm) 11-3/16" (285mm) 12-7/16" (316mm) GTO1502D 15" Dual 2-Ohm Subwoofer 300W 1200W 93dB 23Hz ­ 400Hz 4 Ohms/1 Ohm 5-5/8" (143mm) 13-7/16" (342mm) 15-1/16" (383mm) GTO1504D 15" Dual 4-Ohm Subwoofer 300W 1200W 93dB 23Hz ­ 400Hz 8 Ohms/2 Ohms 5-5/8" (143mm) 13-7/16" (342mm) 15-1/16" (383mm) Specifications and appearance are subject to change without notice. Declaration of Conformity JBL Consumer Products 250 Crossways Park Drive, Woodbury, NY 11797 USA 516. 255. 4JBL (4525) www. jbl. com © 2005 Harman International Industries, Incorporated. [. . . ]