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dard zipcord will reveal some form of coding
on the insulation, e.g., ridge or groove on one
edge, one of the wires may be "silver" while the
other is bare
copper.)
Coded wires help insure
identical connections for each channel.
For each channel, the coded wire can be connected
between the "common" terminal of your loud
speaker and the GROUD terminal of the
ampli
fier channel. The remaining uncoded
wire
is then
connected between the remaining loudspeaker
and amplifier terminals. This insures correct pola
rity or phasing of identical loudspeakers.
If there is any doubt about phasing of loudspeaker
pairs, or if they are not identical loudspeakers,
a simple listening test can verify correct phasing.
With program signals fed to both channels, and
with the MONO IN pushswitches
depressed
,
the sound should appear to originate at a point
midway between
the loudspeakers, with the
balance control
centered.
As the balance control
is turned away from the center position, the sound
source should appear to move toward one of the
loudspeakers. Room acoustics can
sometimes
make this test ambiguous or
confusing.
If so,
temporarily move the loudspeakers as close toge
ther as possible. Then set the controls for balanced
MONO operation and listen to program material
with strong bass passages. Reverse the wires to
one of the loudspeakers and listen to the same
passage again. If there is noticeably less bass with
this reversed connection, change the connections
back to the original arrangement. If there is noti
ceably more bass, leave the wires connected in
reverse
.
These phasing procedures should be used with
each stereo pair of loudspeakers, whether MAIN
or REMOTE. If both pairs of loudspeakers are
used in the same listening area
,
ensure that the
MAIN pair is also "in
phase"
with the REMOTE
pair
.
CAUTION
:
NEVER DIRECTLY CONNECT THE LOUD
SPEAKER TERMINALS OF ONE CHANNEL
IN PARALLEL WITH
THOSE OF
ANY
OTHER. ANY
RESULTING DAMAGE
IS
NOT COVERED UNDER WARRANTY.
FM ANTENNA
The best FM reception is obtained with a Log
Periodic type antenna, mounted on a good quality
rotor system.
For fringe areas, Marantz recommends a Log
Periodic antenna with six or more elements de
signed expressly for FM reception. For minimum
local noise and multipath pickup by the lead
in wires, use a balanced and shielded 300-ohm
cable. (An unshielded lead-in wire can act as
an omnidirectional antenna, and can cancel the
directional benefits of your antenna.) Low-loss
300-ohm shielded cable consists of two inner
conductors plus an outer shield and insulating
jacket. This type of shielded cable effectively
prevents the lead-in from contributing multipath
distortion.
For rural areas, it is recommended that a local
dealer be consulted about antenna installation and
lightning arrestor protection. Master antenna svs
terns are not recommended for use with your
Model 2270; such systems are usually designed
expressly for television reception and frequently
suppress FM signals before distribution. In addition,
master antenna systems often severely limit good
quality FM reception.
Where outdoor antennas are prohibited or incon
venient, use a simple form of 300-ohm, TV "rabbit
ear" antenna or the simple ribbon-type folded
dipole antenna supplied with the Model 2270.
Both are practical and will give satisfactory results
in primary signal areas. Your Model 2270 Receiver
will accept either a
75-ohm
or 300-ohm antenna.
(See diagram Figure 3.) The 300-ohm antenna
cable should be connected to the two terminals
marked FM on the ANTENNA terminal. When
using 75-ohm coaxial antenna cable, connect its
shield to the "G" (GROUND) terminal, and its
inner or center conductor to either of the FM
terminals.
AM ANT
tNN A
FM
ANf[NN A
...NT2,N"....
"' ' ' ' '
1.' ' ' ' 1 ' 0 1' ' ' ,l 1 l i
Ill
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TR
AN . SM
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EAD
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:
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ANT£
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SHIELD
750
COAX.
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soon
SHI[ l
OEO
TRANSMI
SSiON
.
..SHIELD
TRAN
SMI SSI ON
LI
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Figure 3. FM/AM Antenna Connection
4
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