yeah, mine looks to be the similar psu
nothing fancy… I’d assume its the 4ms bus board that does things like filtering.
Id try with nothing else connected - no usb, no patch cables , see if the noise goes.
my experience with noise on the SSP has always been related to other modules
a) patching cables
plugging into a particular module or module on a particular bus would introduce some switching noise - it seem to be worst with mixer modules (likely due to opamps)
b) noise on the bus
having the SSP on the same bus as some digital modules would bring across noise to the SSP.
note: this noise was never crackling, rather digital switching noise - so pretty constant, and pretty quiet - really noticable when you turned up the gain.
I did alot of chasing of this issue around … using different racks and bus boards (including the Genus LIBB bux board)
I learnt a few general things…
even forgetting the SSP for a sec…
Eurorack is a noisy environment - ribbon cables, patch cables are basically are just antenna - things like ground loops are pretty common - digital modules and things like USB really excacerbate these issues.
e.g one confusion I had, is whilst testing the ssp noise issue - is I hadnt realise I had other digital modules that woudl introduce noise - in certain situations/configurations - so sometimes moving the SSP away from those modules would ‘solve’ the problem … until I made certain patch connections which seemed to ‘pollute’ the ground, and so get noise back on the SSP.
if you look at the muffwiggler forum, you’ll find someone having issues with every (more powerful) digital module … Instruo, Qubit, Squarp… all of them , yet others will be absolutely fine - its all put down to cetain modules/rack/power units… so unfortunately, this is pretty common even outside of the SSP
the other thing Id be a bit careful of is assigning noise issues when using things like GRA or patches using alot of CPU.
its really easy to make GRA introduce ‘audio glitches’, just due to the nature of its synthesis.
similarly, perhaps CPU (overload) issues might only surface when graphics are being drawn, as this is taking CPU resources. ( though I believe the drawing is all done on a core that is not used for DSP)
I don’t know… but Id be pretty suspicous if you are only hearing noise when using one particular patch, that sounds more like a patch issue/cpu audio issue.
( I would not 100% trust the cpu meter either )
however, the reality is… I don’t know, as I dont have the issues you describe.
Im surprised an unconnected SSP would have issues - its certainly not been my experience.
btw: one small note…
the Pod64x is quite a bit deeper than the Pod60. also I leave the extra 4hp completely open, to allow air flow. honestly, when I had my SSP in my other racks, I got pretty concerned at how warm it was getting… even though I ensured it had adequate ventilation.
this is why I went with the Pod64x, the SSP now remains nice and cool, even when its been on for many hours (not unusual in a dev session !) which makes me feel much more confident.
that said… I see many have the SSP in racks surrounded by other modules without issue.