4
5
Examples of different tweeter mounting locations, and the results that are most frequently
obtained, are explained below:
1.
A-Pillar
Best option concerning the depth of image and overall sound balance of the
component system. It's not that easy to get right, i.e. excessive mounting effort.
2.
Dash Board
Sometimes aggressive and overly brilliant treble reproduction caused by the horn
loading effects of the front window. Setting tweeter to -3 dB may help.
3.
Window Triangles
Bright sound combined with a high soundstage, sometimes sounding a bit “nervous”
with side biasing.
4.
On the upper end of the door panel
Balanced sound with good staging qualities, reduced sound staging and with side
biasing.
5.
Right on top of the mid/woofer
“Dull” sound, especially with a person sitting on the passenger's seat.
•
Attention:
The main radiation axis of both tweeters should cross at a virtual point approx.
in the center between front of passenger and driver’s seat. A direct “on-axis” installation of
the tweeters, where they aim or point at the listener, is not recommended. The result of tweet-
ers aiming too much in direction of the listener is called “side-biasing”. The sound seems to
originate from the left front door instead of playing in the center of the dash board!
Angled mounting of the Tweeter
The tweeter mounting adapter provides two bearing surfaces with two possible radiation
angles. Inside the adapter you can spot two areas with implied holes for the cable and the
fixing screws. Chose the area you want the way to mount the adapter and drill out the holes
completely: 6 mm for the cable and 2.5 mm for the screws. Mark the location where you are
going to mount the tweeters. Use the mounting adapter as a template and mark the holes
with a 6 mm diameter for the cables and two 2.5 mm holes for the screws. Drill the holes and
mount the adapter with two screws. Feed the wire through the bigger hole and connect it to
the crossover. Lock the tweeter by pushing it down into the mounting adapter.
Flush mounting of the Tweeter
After choosing the best mounting location, make sure there is at least 18 mm of clearance
behind the mounting surface (cable is not taken into account!), before you start to mark or cut
anything! Cut a hole with exactly 44 mm diameter into the mounting surface using a power
drill and a circle cutter tool. Lock the tweeter by pushing it down into the hole. To definitely
secure the tweeter in the hole you can fix it with hot glue or adhesive Butyl tape from behind.
Attach the wire to the crossover.
Crossover mounting and connection
Find a suitable mounting location for the crossovers. For example, the crossovers can be
installed in an existing cavity behind the door panel or below the dashboard. It is advanta-
geous for adjustment work if the crossovers remain easily accessible. Connect the cables
from the tweeters and woofers and from the amplifier to the respective crossovers: the tweeter
crossover is marked with TW +/- IN and TW +/- OUT, the woofer crossover is marked with
WF +/- IN and WF +/- OUT.
Observe the polarities indicated and make sure that everything has been connected correctly.
All speaker cables must be connected to the crossover with correct polarity, i.e. plus to plus,
minus to minus. The sound quality of speakers with the wrong polarity is often dramatically
poor. Missing bass, squawky midrange or extremely diffuse sound are the result of uninten-
tional polarity reversal of the cables.
Pro advice:
Even if the electrical phase of the speakers is correct, i.e. according to the con-
nection diagram, the resulting acoustic phase can deviate from the desired result depending
on the installation location and tweeter orientation. Therefore, you should definitely try whether
reversing the polarity of BOTH tweeters leads to a more harmonious sound with better depth
of soundstage.
Cable cross section
If longer distances from the amplifier to the crossovers have to be overcome, use good quality
speaker cables with a minimum cross section of 2.5 mm². Failure to do so will affect sound
quality in a negative way.
Crossover adjustments
Finally, the tweeter level is adjusted to the given vehicle acoustics and your own taste. This
volume level adjustment takes place via slide switch in the crossover and may also be changed
later after the system has run in.
+3 dB if the tweeter is at a significantly higher distance from the woofer or the installation
location severely limits the level of the tweeter, e.g. in the footwell
0 dB position is usually the setting that provides a good tonal balance for most installs. It is
recommended for the most tweeter positions.
-3 dB as a general rule of thumb, this position is best for tweeters that are mounted very close
to the listener’s head like window triangles or top of the door panels.
•
Attention:
The tweeter attenuation must be chosen identically on both crossovers. After
completing the settings of tweeter attenuation and polarity, you can mount the crossover in
place and reinstall all the other panels / factory grilles a.s.o. Your installation is now complete
and therefore ready, to be checked out.
ECP-M4: The mounting locations of the components for a 10 cm system can be significantly
different than with a classic 13 or 16.5 cm system, in which the woofer is usually to be installed
in the footwell. The M4 tweeter crossover therefore offers another jumper: Select "Short
distance" if the tweeter is placed near the midrange, for example both components in the door.
"Long Distance" is recommended for higher distances from approx. 30 cm (i.e. midrange in
the door, tweeter in the A-pillar).
Testing of the installed system
Slowly turn up the volume of your head unit and listen for distorted sounds. If everything ap-
pears to be okay and it just sounds right, check out the speaker balance of the left and right
side by adjusting the balance control of your head unit. Shifting the balance to the left channel
should provide you with sounds coming solely from the left speaker system, while shifting
the balance to the right should do the same for the right speakers. If anything appears to be
wrong, you must recheck the wiring of the x-overs, the amp or the mid/woofers.
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