7
Whenever you run wires through sheet metal, use tape or grommets to properly
insulate the metal edges from cable jackets. This technique prevents chafing
and possible short circuits that could damage an amplifier or the loudspeakers.
1.
Follow the wiring diagrams
figures
3
and
4
to connect the loud-
speaker system to your automobile radio and possibly to an ampli-
fier.
The tweeters should only be installed through a crossover.
2.
Replace the automobile battery connector and test the loudspeaker
system.
Caution: Do not apply power to the tweeters without first installing
crossovers.
ELECTRICAL INSTALLATION
3.
If you plan to use grilles or panels in front of the loudspeaker, ensure
that sufficient space is available for the path of the loudspeaker co ne .
Should the distance not be sufficient, the cone could vibrate
against the grille or panel thus damaging the loudspeaker.
Installing the Tweeters
Use the enclosed drilling template to cut a suitable hole. Lay the leading
connector cable and mount the parts as shown in
figure
2.
2.
Use the enclosed drilling template to cut a suitable hole in the trim
panel and, if necessary, in the sheet metal behind. Drill holes for the
fastening screws. Mount the parts as shown in
figure
1.
Attention: If sheet metal must be cut or removed contact your
authorized car dealer for professional advice. By damage to sup-
porting body structures the safety certificate may be withdrawn.
Caution: Use care when removing interior trim panels. Car manu-
facturers use a variety of fastening devices that can be damaged in the
disassembly process.
8
Important!
Correct high frequency polarity in the automobile
The correct polarity of tweeter to woofer is a decisive factor for the sound
quality of the entire sound system. A false polarity can even "destroy” the
sound of the best loudspeaker system.
In some cases a polarity reversal (exchanged positive and negative poles) of
both tweeters can result in sound quality improvement. This can result from
the mounting position, from the distance between loudspeaker and listener
or also from the sound reflections in the automobile. Since this is very
specific, it cannot be decided until the loudspeakers have been mounted in
the automobile.
Evaluation of the correct high frequency polarity
After the loudspeakers have been mounted in the automobile, they are
connected with the included crossover. At first the crossover should be
placed in an easily accessible position, preferably directly reachable from the
driver's seat. To recognize the correct polarity as a rule the operation of one
channel (either left or right) is sufficient.
The correct polarity of the tweeter can be evaluated most simply from the
volume.
Adjust the volume control so that the music can be clearly heard in its full
band width (high, mid and deep range).
Play a segment of music (about 20 30 seconds) and pay close attention to
the reproduction. Stop the music and reverse the poles of the tweeter on
the crossover by exchanging the connecting cables (plus / minus). Listen to
the music segment again and try to answer the question which of both
connections was louder. Repeat the experiment until you are completely
sure.
The louder reproduction shows the correct polarity of the system!
After the polarity has been decided upon tweeter level adjustment should be
reconsidered.
Tips:
* In the dark or with closed eyes the sound differences are usually more
audible.
* Use a complex instrumental music segment with several acoustic instruments
for the evaluation.
Should in an exceptional case the available crossover level adjustment still
not be sufficient (high frequency position at -3dB, with the tweeter still too
loud), it is permissible to switch in an additional resistor of 2 6 Ohm in
sequence to the tweeter.