L7
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
equal to that of the
music's
complex frequency
components.
lf
a single speaker wire must con-
duct the full musical frequency
spectrum, this preponderance
of
low frequency information
can
interact with or modulote hþh
frequencies. The resulting
intermodulotion can
create audible
changes to treble even before it
reaches your loudspeakers.
By
using separate conductors
for high and low frequencies
(drawing L-C),
unwanted treble
modulation is avoided. Bass
flows through
one,
treble
through anothen
Frequency-optimized cables
Having the opportunity to use
separate HF
and
LF cables,
allows
you
to employ conductors best
suited to each frequency range. As
previously noted, most
amplifìer
power
ís destined for
your
L7's
woofers,
so upon first consider-
ation, ¡t would make sense to use
veq/
thick
wire
for LF
connections
and
tjrinner
wire
for
HF
connections.
Howeve[the very
fact
that
treble is hþher in frequency, means
it is actually more sensitive to the
type and
gauge
of
wire
used. Hþh
frequencies
are
prone
to
attenuation
from a
phenomenon
called skr:n effedt.
High quality
speaker interconnect wires
minimize skin
effect by
employing
a
large number
of thin conductors
with
very low oxygen content2.
Optimall¡you
should
use audio-
phile interconnects
for both HF
and
LF conductors.
Howeven if
ydirr
budget
intervenes,
use the
best
quality
speaker
cables
for
the
high frequency
connections and
plan to add better bass
cables laæn
Amplifier
flexibility
Bi-wiring
also allows
you
the
option of using
separute stereo
power amplifiers
for left and rþht
L7 loudspeakers
or even
four
mono
power amplifiers.
Using
two stereo amplifiers
'
(drawing L-D)
can not only add
sonic
improvements but
upgrade
convenience
as well.
From
a sound
standpoing
dual amplifiers reduce
intermodulation
between
left
and
right channels,
since
a
complete set
of
input and
power
supply circuits
are
devoted
to each speaker. Dual
amps
also
provide an e:Ny
power
upgrade
path:
you
can start out
lEeoors
acaallyflo,,ralorgfie
orærmostatorm
of a wire, nthertJæn
irside. The nrcre s.¡ráce aleâ,
dæ less resbance
to o-rrrern Tlns üre number cf
indvidul
conducors
(conmbutírgin<reased
skin
area) b more imporarn
únn thejrindividt¿l
drUgtess
2O"¡6en
is a common
imgrrÇ in copper wire.
The,less o46ør, the
beaer con&ctivity. Zp cord
b
cornpoea of
aecoot¡ic ouó
¡itó
copper
(El?C)
and tas slffinrcre
o46en contentúnn dre
o4rgeftft€e hi$ corìductlvÇ copper
(OF{Q
used
h
çecftil
geakerwire
Dra¡ving
L-F
-
Four-Amp Bi-Wire
Drawing
L-C
-
One-Amp Bi-Wire
Drawing
L-D
-Two-Amp
Bi-Wire
Stereo tube amp
Drawing
L-E
-
Three-Amp Bi-Wire
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