GT Series Owners Manual 5/14/99 9:49 AM Page 2
Thank youfor purchasing a newChoosing an Enclosureconstruction is straightforward and thereit, or verify that your design is correct
JBL GT Series subwoofer. SubwooferGT Series subwoofers are optimized toare many prefabricated sealed enclo-if you wish to build it yourself. An
installation often requires woodworkingperform best in small sealed, vented sures available. An optimum sealedoptimum vented enclosure is always
skills and some experience disassem-and prefabricated bandpass enclosures.enclosure is always smaller than otherlarger than the optimum sealed box for
bling and reassembling automotive inte-While inŢnite-baf�e mounting of types of enclosures optimized for a par-the same woofer, and will require more
riors. If you lack the tools or necessaryGT Series subs is possible, power ticular speaker, so they require the small-space inside the vehicle.
skills, have your subwoofer installed byhandling is greatly compromisedest amount of space inside the vehicle.
an authorized JBL dealer.because thereOs no enclosed volume ofBandpass enclosures often provide
air to prevent the speakerOs cone fromVented enclosures provide better efŢ-the most output available from any
Warning: Playing loud music in an auto-moving past its limit. For this reason, ciency in the 40Hz � 50Hz range, but thisampliŢer-and-subwoofer combination at
mobile can permanently damage yourwe do not recommend inŢnite-baf�eefŢciency comes at the expense of soundthe expense of sonic accuracy. If sheer
hearing as well as hinder your ability tomounting for GT Series subwoofers.in the lowest octave (below 40Hz), and atSPL (sound-pressure level) is what you
hear trafŢc. We recommend listening atthe expense of some control and powerdesire most, choose a bandpass
low levels while driving. JBL accepts noYou should choose the enclosure youhandling. If you are using a small enclosure. Bandpass-enclosure design
liability for hearing loss, bodily injury orwill use based on the type of music youampliŢer, a vented box will provide moreis very tricky; using a computer and
property damage resulting from use orlisten to, how much ampliŢer power youbass output from less power. Ventedenclosure-design software is necessary.
misuse of this product. will use for the subwoofer and howenclosures are also well suited to a If you are an experienced installer or
much space inside the vehicle you canvariety of music types. Because ventedhave some woodworking experience,
devote to a subwoofer enclosure.enclosures require the volume of theyou may wish to build the enclosure
enclosure and the size of the port to havedescribed in the SpeciŢcations chart in
Because a sealed enclosure provides thea speciŢc relationship with the character-this manual. Fortunately, there are many
most control over the wooferOs move-istics of the woofer, the enclosure mustprefabricated bandpass boxes available,
ment, a woofer mounted in a sealedbe built exactly to the speciŢcations and they are all optimized to extract the
enclosure can handle more power than aprovided. While there are some prefabri-most output possible from any woofer.
woofer mounted in another enclosurecated vented boxes available, matching aBandpass enclosures can be quite large
type. Sealed enclosures provide moreprefabricated box to a particular wooferand may require a lot of space inside
accurate sonic reproduction than otheris difŢcult. If you wish to use a ventedyour vehicle.
enclosure types, so they are well suitedenclosure, we strongly recommend
02to all types of music. Sealed-enclosurehaving your authorized JBL dealer build |
ACEC
