can you please say again how to perform a pre-cal? I have a DIY V2 dual-mono boards but pressing the enter button (when Tortuga is off) makes the auto-cal start. Apparently, I have no option to run pre-cal.
I also have some questions that are maybe of interest for people having dual-mono balance V2 boards.
In the previous firmware, 20k impendance was such value for single ended boards, but double value (40k) for dual-mono balanced boards.
Is this the same in the new firmware? If it is so, then dual-mono balanced board has only choices for 2, 4, 6, …, 99x2 with steps of two. I was using 2.5k (which is therefore 5k) but I cannot set it in this way and I have few choices as my amp has input impedance 10k
Edit. This is what I found in a previous message. Where can I get the resistor module?
Precision pre-calibration process: Using precision temporary plug-in 0.1% Vishay Dale resistor modules it’s now possible to pre-calibrate the auto-cal circuit thus substantially improving the overall accuracy of auto-calibration. This further improves channel balance with commensurate improved stereo imaging and sound stage. We now do this as part of commissioning each V2.1 board prior to running auto-cal. This process is only warranted with new boards or after making hardware changes such as changing opamps. This process is also applicable to existing V2 boards but will require updated software (free download) plus the resistor modules. Tortuga Audio will soon be offering a relatively inexpensive 4-pack of pre-calibration modules as an option when purchase the V2.1 or as a separate purchase (the DIY’er can also build these themselves).