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Many speaker systems are designed for on-axis listening and often include a
listening window that’s ±30° from the speaker’s 0° axis. That’s great for home
audio or other applications where speakers can be easily pointed at a single
listener. In a car, however, the possible speaker mounting locations don’t always
allow for on-axis placement even for a single listener. In many cases, on-axis
placement for two listeners simply isn’t possible because the mounting locations
are too close to the listeners to allow a single 60° window to cover both listeners.
GTi competition speaker systems incorporate a 35° design axis, which provides an
optimal listening window for each front-seat listener.
LISTENING WINDOWS AND MOUNTING LOCATIONS:
CHOOSING THE BEST MOUNTING LOCATION AND
AIMING THE TWEETER
Using the waveguides and planning your installation carefully will help to provide
the best performance from your GTi competition speaker system. Consider the
illustrations that follow and the ones to the left, when determining the best
mounting locations for your woofers and tweeters.
10
SYSTEM DESIGN USING THE
GTi COMPETITION SPEAKER
SYSTEMS.
Figure 13. Listening window illustrated in three dimensions.
The shaded area in Figure 13
indicates the listening window
(the area over which the wave-
guide is optimized).
The small circle marked 5°
represents one edge of the
listening window and the circle
marked 65° represents the other.
The small white area inside
the 5° circle in the middle
indicates the area considered
to be ”on-axis.”
The circle marked 35° indicates
the design axis, or the center of
the listening window.
65°
65°
- 65°
- 65°
35°
35°
-35°
-35°
5°
5°
-5°
-5°
0°
Shaded Area = Measurement Window
Design Axis
Figure 14. Listening windows viewed in two dimensions.
0°
+5°
-5°
+35°
+65°
-65°
-35°
Figure 17. Woofer mounted in the door and waveguide mounted in
the kick panel or A-pillar. Woofer aimed across the car, and tweeter
aimed at a point between the driver and passenger. Woofer coverage
provided by a single window. Tweeter coverage provided by separate
listening windows.
Figure 18. Woofer and tweeter mounted in the door and aimed across
the car. Coverage provided by a single listening window.
Figure 16. Woofer mounted in the kick panel and tweeter mounted in
the A-pillar and aimed at a point between the driver and passenger.
Coverage provided by separate listening windows.
Figure 15. Woofer and tweeter mounted in the kick panel and aimed
at a point between the driver and passenger. Coverage provided by
separate listening windows.