JBL L7 - Bi-amplification; Bi-amplification Overview; Bi-amplification Requirements; Internal Crossover Comparison

need
to use
"Y'
cords in the
three-amp
and
four-amp bLwire
hook-ups.
"Y'cords
are
available
from many sources
i¡cluding
your
JBL
dealer.
lf
i,oú
häve
hooked up
your L7's
in.any
of the bi-wire confìgura-
tioÀs
indicated, it is
not
advisable
to use additional
speakers,
either separately
or
simultaneously.
As with conventional
one-
amplifier
connections shown
in
tlre main
L Series manual, make
sure
that all
speaker cables are
the same
length.
Bi-amplification
Another
adranced operation
alternative
is bktmplifuaion.
Instead
of being divided
by an inter-
nal crossovec the
full frequency
spectrum
is fikered into two
segments
by a2-way octernal
elecuonic
crossoYen
which is con-
nected between
the
preamplifier
and
power amplifiers.
In bi-amplified
mode,the
LZs
woofer
and midrangdhigh-
frequency
transducers are
connected
direrlly
@ separate
amplifiers.
Only a
portion
of the
LZs inter-
nal dividing network
is used.
The
woofer
and mid-bæs transducer
section
ofthe
crossover are by-
passed via a special
modification
which
can be
performed
by
your
JBL
dealer.
Do not attemptto
b¡-
amplifr
your
L7's without
having
yourJBL dealer do the
proper
modification.
A suÍtable
elect¡onic
cnossover
rdt¡st be
used.
While we
dont discourage
bi-amplification,we
hasten to
note
ttrgtdre
LZs inærnd
crossover
is
difficukto
imprcve
on. ls
phase
coherence,
freedom
fr'om distor-
tion and
effciency
rinleven dte
finest
(and
most
o<pensive)
electronic crctssoveß.
,_J
Drawing
L-l
Rear
of
L 7 speaker
with
stapping
barc
disconnected
JBL
Consumer
Products,
lnc.
240 Crossways
F¿rkWest,
WoodburyNY
¡1797
8500
Balboa Boulevard,
Northridge,
California
9 1329
(sr6) 4e6-3400
H
R Harman
InternationalCompany
Part Number:739IG-L7A
Prinæd
in U.S,A"
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