UAD Powered Plug-Ins Manual v7.1 - Universal Audio

11. Increase Bias (clockwise) until the meter level is reduced by –3.5 dB from
its maximum (for 3.5 dB of overbias; see Manual Calibration Notes).*
*When calibrating at 3.75 or 7.5 IPS, the tone generator is at a lower level, therefore meter resolution
is decreased. To increase meter precision when adjusting bias at the lower tape speeds, consider
temporarily increasing the reproduce level.
Record Level
Calibration
12. Set the Tones frequency to 1 kHz.
13. Adjust Record (input) so the Meters display the level in Table 4 below (the
level depends on tape speed).
Table 4. Meter Levels for Record and HF EQ Adjustments
Tape Speed Meter Level
3.75 IPS –20 dB
7.5 IPS –10 dB
15 IPS 0 dB
30 IPS 0 dB
Record EQ
Calibration
14. Set the Tones frequency to the value in Table 5 below (the frequency depends
on tape speed).
Table 5. Record HF EQ Calibration Frequencies and Levels
Tape Speed Tone Frequency Tone Level
3.75 IPS 5 kHz* –16 dB
7.5 IPS 10 kHz –6 dB
15 IPS 15 kHz +4 dB
30 IPS 20 kHz +4 dB
*Note: 7.5 kHz is specified in Ampex manual.
15. Adjust Record HF EQ (not to be confused with Repro HF) so the
Meters display the level in Table 4 above (the level depends on tape
speed).
Note: If HF EQ is adjusted by a large amount, it may be necessary to recalibrate
the record level (steps 12, 13).
The manual calibration procedure is complete.
For related information, see the Manual Calibration Notes in the next section.
UAD Powered Plug-Ins Manual - 42 - Chapter 2: Ampex ATR-102