spkennyuk
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Chris
Just a suggestion as i am no expert on this subject. But my next step would be to remove the hifiberry boards and try running the sound direct from the PI units headphone out.
Im assuming the hifiberry is a plug in module to give you the phono outs.
If there is no crackle without the hifiberry boards being used as the inputs then you know thats the issue.
My thinking is that whatever is causing the crackle is being picked up by the pins on the hifiberry board. In otherwords its not the PI units at fault or the hifi berry boards its the connection point between the two picking up interference when the second unit is powered on.
If there is no crackle running two units from the phone mini jack outputs on the PI units then try with one hifiberry attached on 1 unit. If you then get crackle swap the hifiberry unit out with the other one. If the crackle stops then it shows the 1st hifiberry is the issue.
Stage 2 if the crackle doesnt stop is try the hifiberry units one at a time in the 2nd PI. Leaving the 1st PI using the mini jack output.
If at that point you get crackle on one hifiberry but not the other then it implies which hifiberry is at fault.
If you get crackle regardless which hifiberry is plugged in but none if the mini jack outputs are used then it suggests that the hifiberries are ok but the connection pins are allowing the interference source to be picked up at the pins.
As i say im no expert im just suggesting the logic i would follow to rule out or rule in the source of the issue.
Just a suggestion as i am no expert on this subject. But my next step would be to remove the hifiberry boards and try running the sound direct from the PI units headphone out.
Im assuming the hifiberry is a plug in module to give you the phono outs.
If there is no crackle without the hifiberry boards being used as the inputs then you know thats the issue.
My thinking is that whatever is causing the crackle is being picked up by the pins on the hifiberry board. In otherwords its not the PI units at fault or the hifi berry boards its the connection point between the two picking up interference when the second unit is powered on.
If there is no crackle running two units from the phone mini jack outputs on the PI units then try with one hifiberry attached on 1 unit. If you then get crackle swap the hifiberry unit out with the other one. If the crackle stops then it shows the 1st hifiberry is the issue.
Stage 2 if the crackle doesnt stop is try the hifiberry units one at a time in the 2nd PI. Leaving the 1st PI using the mini jack output.
If at that point you get crackle on one hifiberry but not the other then it implies which hifiberry is at fault.
If you get crackle regardless which hifiberry is plugged in but none if the mini jack outputs are used then it suggests that the hifiberries are ok but the connection pins are allowing the interference source to be picked up at the pins.
As i say im no expert im just suggesting the logic i would follow to rule out or rule in the source of the issue.