DA OM 7/14/98 11:38 AM Page 5
Observe the following color-codes:
Left+: White
Initially, turn the input sensitivity GAIN
Left�: White with black stripecontrol to its minimum (counter-clock-
Right+: Gray
wise) position.At some point, youOll hear distortion
Right�: Gray with black stripe1.Reconnect the (�) negative lead toon the music peaks. Stop the adjust-
4. If you are connecting your Decade
your vehicleOs battery. Apply power toment and turn it back slightly. This is
Series amplifier to a source unit with
output voltage higher than 4V, connectthe audio system and play a favoritethe maximum undistorted output level
Setting Input Sensitivitymusic track from a CD or tape. (Note:of your system, and should not be
the output signal wires of the sourceProper input sensitivity control settingsexceeded during use.
After the source unit is on, the JBL
unit to the floating ground factory headon Decade Series power amplifiers arebadge (on the top panel) will illumi-3.After adjusting the level of the main
unit inputs. Because the inputs have ancritical to ensure optimum performance,speakers in your system, you should
nate, indicating the amplifier is on. If
impedance of 100K ohms, this connec-low noise levels and maximum systemnot, check the wiring, especially theadjust the remaining channels (if you
tion will provide the best noise-freereliability. As a general rule, controls at
remote connection from the sourceare using a DA3504 or a multi-amp
performance possible.the front end of a system (source, equal-unit. Also refer to OTroubleshooting�system) for the desired system bal-
izers and other processors) should be seton page 7.)ance. YouOll find this easiest to do by
System Setup and Adjustmentas high as possible with the amplifier2.On the source unit, increase the volumeadjusting the channels in the following
Electronic Crossoverinput sensitivity set as low as possiblecontrol until it is approximately 3/4 oforder: 1) front speakers, 2) rear speak-
The electronic crossover(s) in yourwhile still providing adequate volume lev-its maximum output level. Slowlyers, 3) subwoofer. Elaborate, multi-
Decade Series amplifier can be selectedels. Using a high signal level and a lowincrease the Input Sensitivity controlchannel systems may be too complex
as a 12dB/oct. high-pass filter at 120Hzsensitivity setting will help keep back-(clockwise) toward three oO clock and, atto adjust. Your local JBL installation
(HPF), a 12dB/oct. low-pass filter at 80Hzground noise in the system to athe same time, listen to the quality ofspecialist is the best person to help
(LPF) or it can be defeated (FLAT).minimum.the reproduced sound. with such adjustments.
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