McIntosh MAC 1900, Owner'S Manual

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What the Controls Do and How to Use Them
VOLUME ON/OFF:
The VOLUME control regulates the loudness in
both channels. The VOLUME control has been pre-
cision tracked throughout the listening range {0 to
—65 dB) for accurate stereo balance. When rotated
to the counterclockwise position the AC power to the
MAC 1900 is turned off.
BALANCE:
The BALANCE control adjusts for unequal loud-
ness in either the left or right channels. The loudness
of the channels can be varied relative to each other
without affecting their combined loudness.
Left . . . turning the control to the left accents
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.
TONE CONTROLS:
The tone controls on the MAC 1900 are slide con-
trols with a center detent to indicate the flat posi-
tions. Sliding the knob to the left decreases response
and to the right increases response in both channels.
TREBLE:
Sliding the TREBLE control left decreases high
frequency response up to 16 dB at 20,000 Hz.
Sliding the control right increases high frequency
response up to 16 dB at 20,000 Hz.
BASS:
Sliding the BASS control left decreases low fre-
quency response up to 16 dB at 20 Hz.
Sliding the control right increases low frequency
response up to 16 dB at 20 Hz.
HEADPHONES:
The front panel HEADPHONE jack has been de-
signed to feed low impedance dynamic headphones.
Electrostatic headphones generally require higher
power than dynamic headphones. They must be con-
nected to the LEFT and RIGHT MAIN SPEAKER push
connectors on the back of the MAC 1900.
Plug headphones into the front panel HEAD-
PHONE jack. Adjust the front panel VOLUME control
for comfortable headphone listening.
The headphone output is not affected by the
SPEAKER switches.
INPUT SELECTOR:
TAPE 1: Connects the output from a tape recorder
that has its own playback electronics to the high
level amplifying stage of the MAC 1900. In the
TAPE 1 position the MAC 1900 has flat ampli-
fication.
TAPE 2: Connects the output from a tape recorder
that has its own playback electronics to the high
level amplifying stage of the MAC 1900. In the
TAPE 2 position the MAC 1900 has flat amplifi-
cation.
AM: Connects the AM tuner portion of the MAC
1900 to the amplifiers and loudspeakers.
FM: Connects the FM tuner portion of the MAC
1900 to the amplifiers and loudspeakers.
PHONO 1: Connects the output of any magnetic
phono cartridge to the low level amplifying
stages. The response has been shaped to com-
pensate for RIAA characteristics. The input im-
pedance is 47,000 ohms.
PHONO 2: Same as PHONO 1.
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