Sony TC-K890ES - Recording Equalization Calibration

4 Adjust BIAS until both meters indicate equal
playback levels.
A high reading on the
upper meter indicates
a low bias current.
A low reading on the
upper meter indicates
a high bias current.
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An equal reading on both meters indicates the
optimum bias current condition.
5 Adjust REC LEVEL CALIBRATION until both
meters reach the recommended level (REC
CAL).
Recommended level
The bias current is now adjusted to the optimum
level and the tape sensitivity compensation has
been set. Press I, then set CALIBRATION to
OFF. Rewind the tape and start the actual
recording.
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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. :
To emphasize higher frequencies in
recordings
For normal recordings
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.
Adjust 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.