20
When possible, the woofers should be placed in the bottom area of the door lining. The distance
between tweeters, midrange, and woofers should be kept as small as possible, to prevent the sound of
the loudspeakers from being negatively impacted. (
fig. 1
). In order to achieve optimal woofer
performance, i.e., kickbass, the total door space must be used.
Important:
For double woofer sets the door volume should be 30 liters or more.
By using doorboards it is necessary to have at least 10-15 liters of volume per each
woofer.
That means that the splash guard on the doors must be cut in a u-shape in the woofer area and fixed
against resonating. In addition it must be made certain that the woofer is sealed to the door lining to
avoid an acoustical short-circuit. The door space should, in order to promote the flow of the sound
waves, be loosely draped with an absorbent material. A further measure helpful for optimization of sound
is suppressing the resonance of the door metals (on the door inside) with special absorbent mats. If the
door lining has a tendency to resonate, a wooden plate should be installed for further support. If this is
not possible, foam material can be used to lessen the effect. For installations in linings of 2-door vehicles
the same procedures and considerations are recommended.
Rear Windshield Deck
: The woofer should be arranged in direct proximity to the windshield. This
installation position prevents interior-specific difficulties in high-range sound reproduction. The tweeter
and midrange should be positioned as near as possible to the woofer. Additionally, attention should be
paid that the tweeter is the appropriate distance from the rear window and head rests. The rear window
reflects and elevates sound, thereby rendering high frequency sound reproduction shrill and
overpowering. Head rests absorb high frequency sounds.
With rear windshield deck assembly, the use of angle mounts or tiltable housings is also recommended.
A tilted position allows sound to be reflected off the windshield directly toward the front seat, thereby
rendering the sound fuller and more voluminous. Connect the tweeter parts before cutting into the rear
window deck and determine the best position for optimal sound rendition by listening to music at a
moderate volume. The tweeter and midrange should be inserted thereafter to the extreme right or left
(important
for
stereo
location)
in
the
rear
window
deck
(fig. 1).
Fig. 1:
Positioning the Loudspeakers in Doors and Rear Window Deck.
