Marantz 4270 - Marantz 4270 Dolby Unit

SPEAKER PHASING
To assure
the best 4-channel or Stereo separation
and frequency response,
the following tests will
verify
that all four speakers are correctly phased.
1. After the speakers are connected to the 4270,
place all four speakers in the center of the
room.
2.
Set MODE Switch at MONO. Play a record
(or radio or tape) with strong bass tones,
at a
low volume level. Center
the FRONT L-R
and REAR L-R BALANCE controls.
Set
FRONT-REAR BALANCE control at extreme
FRONT position.
3. Position the front (left and right) speakers
about six inches apart, face-to-face. Listen,
particularly
to the apparent loudness of the
bass tones.
4. Next,
turn off all power, but do not disturb
the volume, tone or balance settings. Reverse
connections on
the right-front speaker only.
Turn on the power, and listen again. If the
bass tones now seem louder than in (3) , you
have corrected the phasing between the front
(left and right) speakers. If the bass tones
now
sound softer, then turn off all power and
re-connect
the right-front speaker as you first
had it
connected .
5. Now check phasing between the two left (front
and rear) speakers. Set both FRONT L-R and
REAR L-R BALANCE controls at extreme L
position, and
set FRONT-REAR BALANCE for
equal loudness from
the two speakers. Posi-
tion the two speakers face-to-face, about six
inches
apart , and listen for bass as in (3).
6. Turn off power. Experimentally reverse con-
nections only on
the left-rear speaker. Use the
connection which gives the "best" bass, as
in (4).
7. Last, check phasing between
the two rear
(left
and right) speakers. Center both FRONT
and REAR BALANCE controls. Set FRONT-
REAR BALANCE control
at extreme REAR
position. Position
the two rear speakers face-
to-face as before. Listen for bass.
8. Turn
off power. Experimentally reverse con-
nections
only on the right-rear speaker. Listen
again
to determine the "best " bass method of
connecting
the right-rear speaker. All speakers
will
then be in phase, and you may use all
controls normally.
9. Once having phased
your four speakers, you
need
not repeat the procedure in the future if
you now
code the speaker connections and/or
the speaker cables. Any method of coding is
satisfactory, provided it enables
you, in the
future, to duplicate your now-correct hookup
between speakers and amplifiers.
SPEAKER PLACEMENT
Experimentation will reveal
the best speaker
locations in
your room. The placements are
shown in Figure 4.
5