User manual JBL GT800P

[. . . ] For safety and reliability, they should be securely fastened to prevent them from moving around when driving, or from becoming dangerous missiles in the event of an accident or sudden stop. Select your mounting locations very carefully so as to avoid cutting or drilling into critical components such as brake or fuel lines, and electrical wiring, which may be damaged when drilling holes for the mounting screws. Be especially cautious because these components may be hidden between double-walled panels. The mounting locations for optimum performance will vary from vehicle to vehicle, but in general your Powered Subwoofer will work well just about anywhere: In the trunk, hatch area, or any surface large enough to accommodate it. Just make sure to keep at least 3" clearance around the port end of the unit so that you do not restrict port airflow. [. . . ] If you are using two GT Powered Subwoofers, only one input channel needs to be used on each subwoofer. Please refer to Figure 2 on page 5 for a wiring diagram. Adjustments Volume Level and Crossover Frequency (labeled "X-Over") adjustments are done by ear. The Crossover Frequency may be adjusted over the range of 80Hz to 150Hz. Midpoint on the X-Over scale is at 125Hz. The knob at "9:00" equals 100Hz, and at "3:00" equals 175Hz. We recommend starting your setup procedure with the volume control set at the minimum, and the X-Over set at the most counterclockwise (80Hz) position. Increase the volume level of the source unit to the maximum listening position. This is the point where the main speakers in the system begin to sound slightly distorted. 3. Back off on the source unit's volume control until just below the point where you hear distortion. Slowly increase the Powered Subwoofer volume control until you begin to hear slight distortion from the subwoofer. Mark or remember the position of the Powered Subwoofer volume knob and do not exceed this point in subsequent adjustments. Adjust the volume control so that the bass level is balanced to your taste from the listening position. Specifications 5. Slowly raise the crossover frequency while listening for the smoothest response. When the frequency is properly adjusted, bass will be solid and powerful, but vocals will not be overly bass heavy. If the subwoofer seems to be affecting the vocal range, adjust the frequency downward. Model Description Maximum Output Power Continuous Output Power Crossover Frequency Range Frequency Response Dimensions (HxWxD) GT650P 6-1/2" Powered Tube Subwoofer 80 Watts 50 Watts @ <1% THD 80 ­ 250Hz 50 ­ 250Hz 12-1/8 x 8-1/8 x 12-1/8 inches 308 x 206 x 308mm GT800P 8" Powered Tube Subwoofer 80 Watts 50 Watts @ <1% THD 80 ­ 250Hz 40 ­ 250Hz 14 x 10-1/8 x 12-1/8 inches 356 x 257 x 308mm 07 Service Should your loudspeaker ever need service, return it to the JBL dealer from whom it was purchased. If for some reason this is impractical, call 800-336-4JBL for your nearest warranty station. [. . . ] Attach your bill of sale to this page and keep it in a safe place. The JBL warranty remains in effect for one year from the date of the first consumer purchase unless installed by an authorized JBL dealer. Installation by an authorized JBL dealer will extend the warranty to a period of two years. [. . . ]