GTO422 (New) OM 9/17/98 11:49 AM Page 3
Speaker Placement
Because of the GT Series speakersO versa-
tile mounting options, there are many
placement options which will achieve
excellent sound quality in your vehicle.
Please consider the following to help you
get the most from your speakers. A Note on Power Handling
1. The most spacious stereo image isAs a result of their high efŢciency, all JBL
achieved when the left and right speakersloudspeakers will produce reasonable
are placed as wide apart as possible.volume levels in the automotive environ-
2. The best center image will be achievedment using very little ampliŢer power.
when the distance from the left speakerHowever, the use of a small ampliŢer to
and the right speaker are as equal as pos-Aim Triangle of Tweeter DiffuserInstallation Warnings attain very high volume levels could lead
sible from your listening position. This is Toward Listenerand Tipsto overdriving the ampliŢer. This will
most easily achieved by placing thegenerate high distortion levels which can
Y Be careful not to cut or drill into fuel
speakers as far forward as possible.easily damage loudspeakers, even if the
tanks, fuel lines, brake or hydraulic lines,
3. Treble is directional in nature. Thisrated power of the ampliŢer is below the
vacuum lines or electrical wiring when
means that high frequencies are reducedrated maximum power handling of the
working on your vehicle. Inspect behind
as you move off the tweeterOs axis. If pos-panels before you cut or drill. loudspeaker!
sible, rotate the speakers so that the angleAs a general rule, do not turn up the
Y Make sure that the speaker will
of the tweeter points across the car to thevolume control past the point where
physically Ţt in the mounting location. If
listener on the opposite side. This willdoor mounting, check for adequate clear-you hear distortion in the form of either
make each listener slightly off-axis to theFigure 4bance with the window in both closed andsignal distortion from an overdriven
tweeter that is closest to that listener, butampliŢer or mechanical noise from an
open positions as well as for interference
on axis to the most distant speaker, whichoverstressed speaker.
with the window crank and power
helps compensate for the fact that eachFor the best performance and speaker
window mechanism. If mounting else-
listener is always closer to one speakerreliability, you should select an ampliŢer
where, check for clearance around rear
than to the other (see Figures 4a and 4b).with an output rating slightly higher than
System Designdeck torsion bars, glove box or other
Choosing mounting locations which satis-the maximum power likely to be used to
A more advanced system design can bestructural elements.
fy all of the above criteria will provide thegenerate the desired volume levels. This
achieved by adding a GT, GTX, GTi, orY Do not mount speakers where they will
most satisfying performance.get wet.margin of reserve power will ensure that
equivalent subwoofer to your GT seriesthe ampliŢer will not attempt to deliver
speakers. In this case the GT series multi-Y Make sure that it will be easy to run more power than its design allows.
element speakers will be used as highconnecting wires to the speakers. Trace
and midbass frequency drivers andspeaker wire paths before you undertakeWARNING: Playing loud music over
should have their extremely low frequen-mounting.120dB can permanently damage your
cies blocked by electrical means. ActiveY Always disconnect the ground wire fromhearing. The maximum volume levels
or passive crossovers can be used inthe battery before doing any work on theachievable with JBL speakers combined
order to achieve the best system Ţdelityvehicle.with high power ampliŢcation may
and widest dynamic range. A crossoverCAUTION: Fuel tanks are located directlyexceed safe levels for extended listening.
frequency of between 80Hz and 120Hz isbeneath the rear deck in some cars. CheckWhen listening at high volume levels,
for adequate speaker basket clearancealways use hearing protection or turn itOwnerOs Manualrecommended for the best imaging and
Figure 4awidest dynamic range.before considering this location! down!
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ACEC
