JBL L7 User Manual

L7
Ovvneds
Manual
Supplement
Sped<er
Placement
Bi-Wiring
and
B¡jAnplification
g'
3'
side-mounted
woofers
face inward
Drawing
L-B
-
L7
position
front view
é,
L7
Placement
Drawing
L-A and
L-B
show
optimal
placement
for
your
L7
loudspeakers.
Note
that
the
speakers'
side-mounted
woofers
should
be
placed
inwards
towards
the center
of the
room.
Bi-wiring
The L7's
outer
connection
Panel
and
internal
dividing
network
are
designed
so that
separate
sets
of
speaker
cable
c¿n be
attached
to
the
woofer
(LF)
and
midrangd
treble
(HF) portions
of
the
dividing
networlc
This
confìguration
is
alledbi-wirîng.
Bi-wiring
can
provide several
sonic
advantages
and
considerably
more
flexibility
in
power amplifier
selection.
Reduction
of
intermodulation
The majority
of current
flowing
between
an amplifierand
speaker
is
devoted
to
the
reproduction
of
bass.
fn frLæ"60%
or more
of
an
amp's
power
is destined
for the
woofers.
When current
flows
through
a wire,
it
produces
a
magnetic
fìeld
(EMF) which
expands
and
collapses
at
a rate
Drawing
L-A
-
L7
position
top
view

JBL L7 Specifications

General

Type	Floorstanding
Impedance	6 ohms
Tweeter	1-inch
Super Tweeter	0.75-inch
Midrange	5-inch
Frequency Response	30Hz - 27kHz
Sensitivity	91dB (1 watt/1 meter)
Woofer	12-inch

Summary

Speaker Placement

L7 Placement

Discusses optimal speaker placement for L7 loudspeakers, noting side-mounted woofers should face inward.

Bi-wiring

Explains the L7's connection panel design for separate speaker cable sets to woofer (LF) and midrange/treble (HF) portions.

Reduction of Intermodulation

Explains how speaker wire current flow produces magnetic fields affecting treble, leading to intermodulation.

Frequency-Optimized Cables

Discusses using separate HF and LF cables, suggesting thick wire for LF and thinner for HF, but noting treble sensitivity.

Amplifier Flexibility

Explains how bi-wiring allows using separate stereo or mono power amplifiers for left/right channels or HF/LF.

Bi-wiring Connections

Bi-wiring Connection Precautions

Critical steps for bi-wiring: remove strapping bars, use Y-cords, avoid extra speakers, use same cable length.

Two-Amp Bi-Wire Setup

Illustrates connecting two stereo amplifiers for bi-wiring, with a detail for each L7 speaker.

Four-Amp Bi-Wire Setup

Details connecting four mono amplifiers for bi-wiring, showing hook-up for left and right speakers.

Bi-amplification

Bi-amplification Overview

Explains bi-amplification uses external electronic crossovers to filter signals for separate amplifiers.

Bi-amplification Requirements

States L7's internal crossover is partially bypassed via dealer modification; requires electronic crossover and separate amps.

Internal Crossover Comparison

Notes the L7's internal crossover is difficult to improve upon, rivaling expensive external units.