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Text excerpt from page 12 (click to view)
Crossover Tweeter Level Adjustment
The GTi system crossover allows you to adjust the level of the GTi systems tweeter. This adjustment is located under the crossover cover. To remove this cover simply press on the end of the cover (as shown in Figure G) and lift off. The adjustment of the tweeter level is done by setting the switch on the crossover (see Figure H) to the �0dB�, ��2dB� or ��4dB� position. Set this switch in the position that matches you personal preference. Both crossovers should have this switch set in the same position. Figure H
LIFT
PRESS
will generate high distortion levels which can easily damage loudspeakers, even if the rated power of the amplifier is below the rated maximum power handling of the
loudspeaker!
Figure G
OdB �2dB �4dB
As a general rule, do not turn up the volume control past the point where you hear distortion in the form of either signal distortion from an overdriven amplifier or mechanical noise from an overstressed For the best performance and speaker.
system reliability, you should select an
amplifier with an output rating greater than the maximum power likely to be used to generate the desired volume levels. If you
want your system �Loud + Clear,� we suggest that you step up to a JBL power amplifier which has an RMS power rating equal to, but not exceeding, the Maximum Recommended Amplifier Power listed in the specifications of your specific JBL speaker. This margin of reserve power will ensure that the amplifier will not attempt to deliver more power than its design allows. Your dealer will be happy to point out which high power JBL amplifiers are
Speaker Break-In
The 404 and 504GTi woofer/ midranges use many high strength materials which require benefit from a break-in period before they will achieve top performance. After a break-in period of about 1-hour at moderate volume the drivers will achieve peak performance.
A Note on Power Handling
As a result of their high efficiency, all JBL loudspeakers will produce reasonable volume levels in the automotive environment using very little amplifier power. However, the use of a low-powered amplifier to attain very high volume levels could lead to overdriving the amplifier. This
