When you have finished the physical installation and electrical connections, test the system.
Turn on your radio/tape or CD player, but leave the volume control very low. Tune in a station
or play a CD or tape, and check the individual drive units to make sure they are all operating.
If you hear poor sound, distortion, or no sound, immediately turn off the system and see
Troubleshooting. Operate the balance and fader controls to make sure all connections have
been properly made. When you are satisfied with the basic installation, proceed with the final
adjustments.
Tweeter level
Differing installations require different amounts of high frequency output. If the 336PX
tweeters are mounted relatively close to the listener, you may want to reduce their output. If
they are mounted farther away from the listener, or if the interior of the car is very absorptive,
you may want increased high-frequency output. The 336PX crossovers have a switch that lets
you adjust the high frequency output.
Listen carefully to some wide range, high-quality program material, paying particular attention
to the bass/treble balance. If your system is Bi-wired, turn the system down and move the
switches from the “mid” position to the “high” or “low” position. Listen to the same
selection and decide if the treble/bass balance of the system is more natural or not. Repeat
the process until the most natural bass/treble balance is achieved. If your system is bi-amped,
leave the tweeter level control in the “mid” position and use the input sensitivity controls on
the amplifier channels driving the tweeters to fine tune their level.
Tweeter polarity
The varying position of the listener with regard to the individual loudspeaker drivers also has
an effect on the response of the 336PX system in the crossover frequency region. Typically the
crossover equalization switch should be left in the “A” position. This produces the smoothest,
most natural response when the tweeter and woofer are at an equal distance from the
listener. In some installations, the spacing of the woofer and tweeter relative to the listening
position may result in a response dip at the crossover when the in-phase “A” position is used.
If this happens, set the Tweeter Polarity switch on both crossovers to the “B” position. If you
have access to a signal generator or a CD with test tones, try both switch positions while
playing a tone at or near 3kHz. Leave the switch in the position which gives the most output.
tweeter protection
The 336PX tweeter is protected by a solid-state protection device. In the event of
overpowering or excessive amplifier clipping, this protection circuit will reduce the tweeter
level for the duration of the overload. Once the condition causing the overload is rectified the
tweeter operation will be restored. When the protection circuit is activated, an LED located
adjacent to the tweeter polarity switch will flicker in the presence of a high-level audio signal.
This should happen rarely if at all. If the tweeter protection trips often it is a sign of either an
amplifier which is under or over powered, or a problem with the tweeter or itís wiring. Please
contact your a/d/s/ dealer or a/d/s/ Customer Service department if this should occur.
8
adjustments