be over driven so amplifier output clipping is
eliminated. Clipping is caused when the amplifier is
asked to produce more power output than it can
deliver with low distortion. Amplifiers are capable of
delivering large quantities of power when they are
driven to clipping and can have more than 40% har-
monic distortion. The extra energy content of the
clipped signal will damage most speakers. A Mcln-
tosh advancement helps to protect your speaker
from this kind of damage. The MAC 4100 has a built
in "waveform comparator" that compares the wave
shape of the input signal with the output signal. If
the non-linearity between the two signals exceeds
0.5% the POWER GUARD circuit operates. Opera-
tion is indicated when the LEDs at the top of the
amplifier power indicator are lighted in red. As long
as the amplifier operates without overload the NOR-
MAL indicator illuminates. With POWER GUARD
operating the output waveform distortion is limited
to 1 %.
INPUT INDICATORS
At the bottom right of the tuning dial area are
eight LEDs, six indicate the status of the INPUT
SELECTOR switch. The illuminated LED indicates
the program source selected.
The two remaining LEDs indicate AFL and FM
MPX. AFL indicates the operation of the automatic
frequency lock circuit showing that the tuner is cor-
rectly tuned to the center frequency of the FM sta-
tion.
FM MPX - indicates the FM station is broad-
casting a 19 kHz pilot signal necessary for the
transmission of FM stereo programs. It denotes the
station is broadcasting stereo.
Balancing Your Stereo
The performance and enjoyment of a stereo
system is greatly increased when the sound is pro-
perly balanced. The balance of the stereo system is
affected by many things including room acoustics,
furniture placement, room shape, small differences
in loudspeakers etc. Factors that affect proper
stereo balance are correct phase for both channels
and equal program loudness.
TO ADJUST PHASE
Press the MONO pushbutton. Turn the BALANCE
control to 12 o'clock. Stand about ten feet In front of
and midway between the loudspeakers. The sound
should appear to come directly from in front of you.
If the sound is not directly in front of you, reverse the
leads on one of the loudspeakers only. When the
sound comes from the midpoint between the
speakers they are in phase.
TO BALANCE LOUDNESS
Press the MONO pushbutton. Play a familiar
recording. Turn the BALANCE control to the 12
o'clock position. While the program is playing stand
between the two loudspeakers. Listen for a dif-
ference in loudness between speakers. If there is a
difference in loudness, turn the BALANCE control
toward the speaker that is not as loud. Adjust the
BALANCE control until the sound is balanced bet-
ween both speakers.
Listening to Your Stereo
FOR ALL LISTENING
Set the "SPEAKERS" pushbuttons in for opera-
tion of the desired speakers. Set the monitor
pushbuttons out except for tape listening. Turn on
power by pressing the POWER ON button in.
LISTENING TO A STEREO RECORD
Turn the INPUT SELECTOR to PHono 1 or PHono 2
whichever is connected to the turntable you wish to
hear. Set the MONO pushbutton out for stereo. Ad-
just the VOLUME control to desired volume. Adjust
the LOUDness control for any desired compensa-
tion.
LISTENING TO A MONOPHONIC RECORD
Push the MONO pushbutton in for MONO. Adjust
the VOLUME control to desired volume. Adjust the
LOUDness control to any desired compensation.
LISTENING TO A STEREO TAPE RECORDER
Push in either MONITOR TAPE 1 or TAPE 2,
whichever is connected to the tape recorder you
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