UAD Powered Plug-Ins Manual - 41 - Chapter 2: Ampex ATR-102
To manually calibrate UAD Ampex ATR-102:
Repro Level
Calibration
1. Set the Manual Cal Knob to the “MRL” position. The built-in alignment tape
tone will sound and its level can be viewed on the Meters.
2. Set the Tones frequency to 1 kHz.
3. Adjust Reproduce (output) so the Meters display 0 dB.
Repro EQ
Calibration
4. Set the Tones frequency to 10 kHz.
5. Adjust Repro HF (not to be confused with HF EQ) so the Meters
display 0 dB.
6. Set the Tones frequency to 100 Hz.
7. Adjust Repro LF so the Meters display 0 dB (or as close as possible).*
*Because the MRL alignment tapes we used have fringing compensation, it may not be possible to
increase Repro LF enough to make the meter reach 0 dB at low frequencies. If a flat response is
desired, you can switch the Manual Cal knob from MRL mode to the “external” tones then readjust
Repro LF for flat response (0 dB) using the external tones instead of the MRL tones.
Note: If Repro HF and/or Repro LF EQs are adjusted by a large amount, it
may be necessary to recalibrate the output level (steps 1–3).
Record Bias
Calibration
8. Set the Manual Cal Knob to the tone level position in Table 3 below (the
tone level depends on tape speed).
9. Set the Tones frequency to the value in Table 3 below (the frequency de-
pends on tape speed).
10. Adjust Bias throughout its range until the Meters reach the maximum level
achievable with the Bias control.*
*If the meters reach their maximum “pinned” value, you may temporarily reduce the Reproduce
level to lower the meters, so the maximum achievable level can be accurately viewed (the maxi-
mum achievable level may be higher than the pinned value of 3 dB).
Table 3. Record Bias Calibration Frequencies and Levels
Tape Speed Tone Frequency Tone Level
3.75 IPS 2.5 kHz –16 dB
7.5 IPS 5 kHz –6 dB
15 IPS 10 kHz +4 dB
30 IPS 20 kHz +4 dB
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