_RHEA Calibration

_RHEA VU calibration

Requirements:

• GConManager v9.1.xxxx or higher running in admin mode – how to open in admin mode please check FAQ.
• _RHEA also must be updated to at least v9.1.xxxx software.
• DAW with tone generator insert and some level measurement functionality (e.g. plug-in).

To start the procedure please open GConManager in admin mode (please check FAQ) and head to _CONFIG application. Then _RHEA unit needs to be selected on the left side of the screen.

Fields description in GConManager config “advanced” tab (Please note that this is just explanation for You to have better understanding of the procedure, however You can go directly to the procedure below):

• Grayed out field „METER CALIBRATION (ADC)” shows measured ADC value which can be used as a starting point to calibrate each compression level. It is a software reference point to match compression levels.
• „ADC VALUE” column is used to set both meters (values have to be within 0-255 range)
• „DAC SHIFT (+/-)” column provides compensation for physical meter (values have to be within +/-99 range) positive or negative values should be used depending on the needle position – e.g. if physical needle needs to be moved left to visualize certain compression level, negative value should be used.

Important Notes:

• Each GR level must be calibrated – 0, 4, 8, 12, 16, 20dB.
• Make sure that the physical meter has a properly set „0” position.

Calibration procedure:

1) Power on chassis with _RHEA installed and let it warm up for 30 minutes.
2) Open GConManager in admin mode. Go to „CONFIG” and select _RHEA from the list, then select the „ADVANCED” tab.
3) Press the „SET DEFAULT” button, then press „APPLY”. See picture below.
4) Generate test signal (sine wave 1KHz), send it to the hardware unit, and receive it back in Your DAW.

5) Follow this step for 4dB/8dB/12dB/16dB/20dB gain reduction:

• Set unit to compress desired level (4dB/8dB/12dB/16dB/20dB) so You will get the same difference between INPUT and OUTPUT(so 4dB compression level, output should be lower by 4dB when compared to INPUT). The easiest method to do this is to set INPUT and OUTPUT to 0 (all LEDs OFF) MIX 100%, and use a threshold to get 4dB of compression – so output will drop by 4dB when You will disable BYPASS. Higher gain reduction modes could be a little bit more tricky to achieve depending on the audio interface that You use – in that case You need to set INPUT to higher value, but please note that You need to have it in mind when gain reduction on the output is calculated.
• Set ADC value for particular compression level measured by „METER CALIBRATION (ADC)” and press „APPLY” (adjust if necessary). E.g. set 102 in ADC column for 4GR level if this is what “METER CALIBRATION(ADC)” field shows for 4 dB of gain difference between INPUT and OUTPUT.
• If plug-in meter shows correct value, type in „DAC SHIFT (+/-)” value to match physical meter with plug-in meter and press „APPLY”. For example if a physical needle needs to be moved left to visualize that compression level, set some negative value (e.g. -30) and hit APPLY, change the value accordingly depending where the needle is.

6) As a final step we need to set up a physical meter 0-4dB compression range. Set threshold to around 1dB of gain reduction, plug-in meter should show 1dB accordingly, and set „DAC SHIFT (+/-)” value to match physical meter with a plug-in meter and press “APPLY” – repeat this step until plug-in meter and physical meter won’t show the same position.