pushbutton and to monitor the copy use MONITOR
TAPE 2 pushbutton.
TAPE COPY T2 T1 pushbutton out: The program
source selected by the INPUT SELECTOR is fed to the
input of tape recorder 1. Pushbutton in: Connects the
output from tape recorder 2 to the input of tape
recorder 1 without affecting the program being heard
from the speakers. In this position a copy of the pro-
gram on recorder 2 can be made on recorder 1. To
monitor the original use MONITOR TAPE 2 pushbut-
ton and to monitor the copy use MONITOR TAPE 1
pushbutton.
MONO: The MONO pushbutton switches the audio
circuits from stereo mode to MONO. The program
heard will be monophonic. The TAPE OUT jacks are
not affected by the MONO pushbutton.
EQUALIZER FREQUENCY CONTROLS
Each of three EQUALIZER FREQUENCY controls
modifies upward or downward the tone balance of a
band of frequencies centered on the frequency mark-
ed above the control. The flat position of the control
has a detent for easy reference. Each control provides
12 dB boost or cut at the specified center frequency.
Use the EQUALIZER FREQUENCY controls to
modify the sound and tone balance of program
material. Here are some suggestions from which to
start:
Problem
Bass too weak
Male vocalist needs reinforcing
Hum on program
Female vocalist reinforcing
Violins, trumpets dull
Drum "brushes" not audible
Hiss and/or noise on program
Equalizer Correction
Raise 30
Raise 30
Reduce 30
Raise 750
Raise 750
Raise 10 K
Reduce 10 K
BALANCE and
LOUDness
The BALANCE and
LOUDness controls are
concentric. The BAL-
ANCE control (large
outer knob) adjusts for
equal volume of either
the left or right chan-
nels. The volume of the channels can be varied
relative to each other without affecting their combin-
ed volume.
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.
The LOUDness control (small center knob) in-
creases both bass and treble frequencies of both
channels as it is turned clockwise. Adjustment of the
LOUDness control allows life-like frequency balance
when playing music softly. Its contour is the same,
regardless of the position of the volume control. This
contour is accurately modeled after the family of
"Equal Loudness" curves identified by Fletcher and
Munson. The flat response position of the control has
a detent for easy reference.
The loudness circuitry is completely independent
of the volume control. Therefore, any desired amount
of compensation can be introduced regardless of
volume control position.
VOLUME CONTROL
The VOLUME con-
trol is a precision step
control manufactured
for Mcintosh Labora-
tory. It has 32 steps
with a 70 dB range,
plus volume off. Left
and right channel
tracking are within
1 dB. This extreme accuracy is obtained through
special electronically controlled resistance element
trimming. Tracking accuracy is permanently main-
tained and operation is noise free.
HEADPHONE JACK
A HEADPHONE jack is provided to drive low im-
pedance dynamic headphones from an internal power
amplifier.
-7-
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