Operation Manual

C
(Note:
Close inspection
of
ständard
zipcord
will
'pvaal
\orp
lorr o'codinq o'1 lhp r1'ulatron,4,q,,
rioqF o'
g'oovp
on ono
pouo.
onp o
ll'F
wrrp"
näy
be
"silver"
while the other
is
bare copper.)
Coded
wires
help insure identical connections
for each
channel,
For
each channe.
the coded wire can be connecred
between the
"commoi"
termjnal of
your
loudspeaker
and the
GROUND terminal of the
amplifier
channel. The
remaining uncoded wire is
then connected
between the remaininq
Loudspeaker
and
amplifier lerminals.
This insures correct
polarity
or
phasing
o{
identical
loudspeakers.
l{ there
is any doubt about
phasing
o{ loudspeaker
pairs,
or if they are
not
identical
loudspeakers, a
simple
listeninq
test
can
verify correct
phasing.
With
program
signals fed to both channels, and
with the
MONO
pushswitch
depressed, the sound
should
appear to originale at a
point
midway
between
the loudspeakers,
with
the
balance control
centered.
As the balance contro is turned away
from the center
position,
the sound source
shou d
appear
to move toward one
of the Loudspeakers.
Room
acoustics can somelimes
make this test
ambiquous
or confusing.
lf so, lemporari
y
rnove
the
loudspeakers as c ose toqether
as
possible.
Then
set the controls
for
balanced
IMONO operätion and
listen to
program
material with strong
bass
pass
ages. Reverse the
wires to one of the loudspeakers
and listen
to the same
passage
again- lf there is
.ofic"obly
less b"\s w l I'
c
'Fvp
'ad
,
orn"cr:on.
change
the connections back to the original ar
ranqement.
lf there is noticeably more bass,
leave
the wires connected in reverse,
These
phasinq procedures
should be used with each
stereo
pair
of
Loudspeakers, whether IMAIN or
REMOTE.
lf both
pairs
of loudspeakers are used in
the sanre listening
area, ensLrre that the [4AlN
peir
is also
"in phase"
with
the REMOTE
pair.
CAUTION:
NEVER
DIRECTLY CONNECT THE LOUD
SPEAKER
TERIV]INALS OF ONE CHANNEL
IN
PARALLEL WITH THOSE OF ANY
OTHER. ANY RESULTING
DAMAGE IS
NOT COVER ED UNDE R
WARRANTY.
FM ANTENNA
The best
F [/] reception
is obtained with a
Log-Periodic
type
antenna,
moLnted
on a
qood
quality
rolor system. For fringe areäs, I\4arantz
recommends a
Log Periodic
antenna with six or
more elements designed expresslV Jor FM
reception. For minimum local noise
and
multipath
picl<Lrp
by the lead in wires, Lrse a balanced änd
shielded
300ohm cable.
(An
unshielded lead-in
wire can
act as än omnidirectional antenna,
and
can cancel
the directional benefits of
your
ä1'pr1a.) Lolv
los.300.ol_Tl \'
eld"d cdb'p
'
or\,sls
of two inner conductors
plus
an ouler shield and
insulating
jacket.
This type of shielded cabe
effectively
prevents
the
lead-in from
contributifg
multipath distortion.
For rural
areas, it is recommended that a loca
dealer be
consulted about antenna installation and
lightning
arrestor
protection-
I\,4aster
antenna
system
are not recommefded
{or
use with
your
Model 2245; such systems are
usually
designed
expressly
{or television
reception
and
frectuently
suppress
FM siqnals before distribution. ln
addition,
rnaster antenna systems
often
severely
limit
good
qLrality
FIVI
reception.
Where ouldoor antennas
are
prohibited
or
inconvenient,
use a simple
form
of 300-ohm, TV
"rabbit
ear"
antenna or the simple
ribbon
type
{olded dipole anterrna supplied
with the lvlodel
2245.
Aarh are
practical
änd will
qive
satisfactory
results in
primarv
siqnal
areas.
Your [,4odel
2245
Receiver
will accept either a 75 ohm or 300 ohm
antenna.
(See
diagram
Figure
3.)
The
300ohm
inrenna cable should be connecled
to
the two
terminals marked
FIM on the
ANTENNA terminal.
When using
75 ohm coaxial
antenna cable, connect
its sh;eld
to the
"G"
(GROUND)
terminal, and its
inner or center conductor
to either
of
the
FM
üü
Fiqure
3.
Fl',4/A[4 Antenna Connection