McIntosh MA 5100, Owner'S Manual

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L + R TO R: connects the "left plus right"
programs to the "right" loudspeaker only.
COMP (COMPENSATION): Use the COMP
switch to correct for phono equalization intro-
duced in the recording process. All current
stereo recordings use RIAA equalization.
Some early stereo and mono recordings use
LP equalization.
TAPE: The TAPE switch makes it possible to
instantaneously compare recorded material
with the signal source. Tape jacks on the
back panel accept a signal from a tape re-
corder with a monitor head and preamplifier.
NORMAL . . . the program source is fed
through the power amplifiers and the loud-
speakers.
MONITOR . . . the signal source becomes
the recorded tape and is fed through the
power preamplifiers and loudspeakers.
When the switch is in the MONITOR position
a triangle is lighted above the switch. When
the light is on only the tape can be heard.
To listen normally the light must be off.
PHASE: Electronically reverses phase in the
left channel to correct "out of phase" program
sources.
SPEAKER: For private listening on head-
phones the loudspeakers can be turned off.
When the switch is in the OFF position a tri-
angle is lighted above the switch. When the
light is on sound will not be heard from the
speakers. Only the headphones will be heard.
POWER: The POWER switch controls the AC
input power, It turns the MA5100 on and off.
The switch also controls the three black AC
outlets on the back panel.
L.F. (LOW FREQUENCY FILTER): Use the L.F.
filter switch to reduce objectionable low-fre-
quency noise created by a turntable or record
changer and acoustically coupled feedback.
FLAT . . . filter disconnected.
FILTER ... low-frequency rumble and noise
below 50 Hz are reduced when the switch
is pushed to the FILTER position.
H.F. (HIGH-FREQUENCY FILTER): Use the
H.F. filter switch to reduce objectionable high-
frequency noise such as record scratch.
FLAT . . . filter disconnected.
FILTER . . . rolls off response sharply at
5 kHz.
LOUD: When the volume is reduced, the music
will seem to lose much of its bass and some
of its treble. This effect is due to the sensi-
tivity characteristic of human hearing. The
response of the human ear to bass and treble
pitch decreases more rapidly than its re-
sponse to notes centered in the mid-tonal
range. The LOUD control automatically pro-
vides the correct amount of bass and treble
boost required to compensate for this change
in response of the human ear at low-loudness
levels. When the "LOUD" switch is moved to
the IN position, it converts the volume control
to a loudness compensated control. Use the
LOUD IN to listen at low volume and still hear
full-frequency range.
BALANCE CONTROL: Use the BALANCE con-
trol to adjust both channels to equal loud-
ness. The volume of each speaker system
relative to the other can be varied, at the
same time their combined volume level is
maintained.
LEFT . . . turning the control to the left ac-
cents the left channel by reducing the right
channel output.
RIGHT . . , turning the control to the right
accents the right channel by reducing the
left channel output.
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