The following actions do NOT trigger a change in delay:
-Soft powering down Okto with remote (I believe this is more of standby mode as Okto remains visible to a computer)
-Changing DSP configuration
-Changing DSP inputs
Have you contacted Pavel with those findings?
The number of channels used should not impact the signal quality. Your cable lengths should be perfectly fine; AES should work reliably over 360m. SP/DIF on the other hand is "officialy" designed for just 1m, but I haven't encountered any problems with 5m cables. Are you using proper 75 Ohm cables on the SP/DIF side?I have also been doing a bit of experimenting with a nanoDIGI as it is a low cost option with 8 channels of digital output. Unfortunately it only has coaxial SPDIF outputs so it will not interface directly with the Okto's AES inputs. At first I tried using 6 ft long RCA to XLR cables from monoprice. This worked well for up to 4 channels of output from the nanoDIGI but if more channels of output are used there is significant noise / crackling. I also tried using 1.5 ft RCA to BNC cables to Neutrik NADITBNC-M transformers to 3 ft AES cables. In this configuration I could use up to 6 channels of output with no issue but if I tried to use all 8 channels I would get noise / crackling. I did not have any shorter cables to try and I wonder if I could use all 8 channels with shorter cables. In any event for applications that require 6 channels of output the nanoDIGI is a great low cost option for the Okto.l
How frequent is the noise/crackling? Does it occur on all channels? The Okto DAC's manual states that it requires the inputs to be mutually synchronized and carry signals with matching sampling rates. Does the nanoDIGI guarantee that? Do you have any 8 channel SP/DIF sources other than the nanoDIGI?
I've bought Canare bcj-xp-trb transformers specifically so that I can avoid the extra AES cable(s), but I haven's tested more than 2 channels at the same time yet.