Sony TC-K890ES - Making an Optimum Recording; Bias and Recording Level Calibration

EV tate an Optimum Recording |
Ls PRES RES AFG DT TAS 7
Your unit is equipped with the ATS (Automatic Tape
Selection) system which sets the appropriate equalization
characteristics and bias current for each tape type, an
additional calibration adjustment can often produce even
better results. Use the bias current and recording level
calibration function to obtain the optimum recording
conditions for your tape.
1 Insert a cassette with the side to be recorded
Adjusts
bias
current
Adjusts
recording
level
facing
outward.
within + 20% within +308
Bias calibration
Choosing the optimum bias current for a tape ensures
minimum distortion and flat frequency response. Lowering
the bias current boosts high-frequency response, but also
results in higher distortion. Raising the bias, on the other
hand, reduces distortion, but also dampens high-frequency
response. Optimum bias is thus obtained when the bias
current and high-frequency response are well balanced.
2 Press CALIBRATION.
Bias reduced (-)
3 Press @ , then If or B> to activate the
a
GD
s
3
= recording test tones:
=|
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5
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Bias increased (+)
Frequency in Hz
* By changing the bias, you can tailor the response to your
liking, for example by slightly emphasizing the upper or
lower end.
* The frequency response of metal tapes is much less
affected by changes in the bias current than other tape
types, and in some cases is uneffected. With some tapes,
the adjustment range of this deck (420%) may therefore
not be sufficient to cover every possible requirement.
Playback level for an 8-kHz signal
Recording level calibration
Even when the recording level is adjusted correctly, using a
tape with low sensitivity will result in a low playback level.
The REC LEVEL calibration control allows you to
compensate for sensitivity differences among tapes to
equalize both recording and playback levels. This is
especially
important
when
using
the
Dolby
NR
system,
since
Notes
it
is
most
effective
when
recording
and
playback
levels
are
*
The
sound
cannot
be
monitored
during
the
the
same.
calibration
operation.
* It takes 2 to 3 seconds for the test tone level to
stabilize.
Playback level for a 400-Hz signal
1A