REC EQ CAL
NORMAL
Making an Optimum
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Recording Equalization
Calibration
Although bias currrent and equalization are
automatically set by the Automatic Tape
Selection (ATS) function for the tape being
used, you can use the REC EQ CAL switch
to change the recording characteristics
according to the nature of the source
material or to compensate for the particular
characteristics of the tape.
Fig. EJ shows the REC EQ CAL switch.
a) To emphasize higher frequencies in
recordings
b) For normal recordings
c) To dampen higher frequencies in
recordings
Bias Calibration Recording
Use the REC EQ CAL switch in conjunction
with the BIAS control to modify bands of
sound and record according to the tape's
characteristics.
¢ When recording music which has
strong middle and low frequencies
Set the bias at flat with the REC EQ CAL
switch set in the HIGH position to increase
the bias current.
Adjust the BIAS control so that the HIGH
and LOW meters indicate equal readings.
+ When recording music which has
strong high frequencies
Set the bias at flat with the REC EQ CAL
switch set in the LOW position to
decrease the bias current.
Adjusi the BIAS control so that the HIGH
and LOW meters indicate equal readings.
Note
With metal tape, because the amount of
frequency characteristic modulation is not in
proportion to that of the bias, the optimum
bias current may not be obtained using the
methods above.
Another use of the REC EQ CAL
switch
When using special tapes, adjusting the
BIAS control with the REC EQ CAL switch
set in the NORMAL position may not result
in equal readings on the HIGH and LOW
meters. If this occurs, adjust the BIAS
control after setting the REC EQ CAL
switch to HIGH or LOW.
