Owner's manual

UAD Powered Plug-Ins Manual - 42 - Chapter 2: Ampex ATR-102

Manual Calibration Notes

• 0 dB on the output meter represents +4 dBm (and –12 dBFS digital) when

Reproduce is in its calibrated position, which is marked with the “red arrow

sticker.”

• For proper calibration, follow the entire calibration procedure in order.

• This example uses 3.5 dB overbias. The amount of gain reduction in step 12

determines the amount of overbias. In some cases we used more than

3.5 dB of overbias to achieve a ﬂatter response.

• Generally speaking, higher Cal Level values will have higher Distortion

Meter values for a given reading on the Meters. If Bias is set ver

y low, dis-

tortion may increase at lower Cal Levels.

• We recommend leaving the record SHELF EQ control in its default position.

• The Ampex ATR-102 hardware has an additional gain control via a set-

screw (like Repro HF/LF, Bias, etc) which is usually used for manual gain

calibrations. This control is not available in the plug-in because it would be

redundant – the Reproduce control performs the same function.

•

We chose to calibrate our reference machine using MRL fringing-compen-

sated calibration tapes, without later adjusting the Repro LF EQ for unity

gain using exter

nal test tones. Therefore the calibrated values in the plug-in

reﬂect this alignment method. In-depth discussions about fringing compen-

sation and system alignment are beyond the scope of this manual; thorough

resources are available from the MRL website at: http://www.mrltapes.com

• T

ape Type 111 uses a calibration level of 0 dB. This value is not available

in the plug-in, but it can be emulated by setting the CAL level to +3 dB, then

reducing the input level (Record knob) by –3 dB and increasing the output

level (Reproduce knob) by +3 dB.

• The plug-in operates at an internal level of –12 dBFS. Therefore a digital sig-

nal with a level of –12 dB below full scale digital (0 dBFS) at the plug-in in-

put will represent 0 dB on the plug-in meters (if the plug-in is calibrated).

• The included artist presets demonstrate how manual calibration can be

used to obtain sonic variations (see “Ar

tist Presets” on page 22).

Tip: For easy recall in future sessions, save unique calibrations as a preset.