I think you have a floating ground. The ethernet is on a different ground than your power, and the hiss is the white noise difference between the two.
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Yes, the chain of all connected devices goes through several power sockets, and those are definitely on different circuits, connected to different fusesā¦
What I would recommend trying is to get a cheap passive DI with ground lift. You donāt need to spend more than 20-30 euro on this. In fact itās a good excuse to get get a Behringer BDI-21, nice little SansAmp BDDI clone.
Anyway, then instead of running your bass in to the audio interface directly, instead run it in the the DI, and plug the DI output into the audio interface instead. Then use the ground lift on the DI to break the ground connection between the bass and the audio interface.
Sometimes this helps.
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So, the fun part is: I have this issue also when the bass is NOT connected.
A DI would not help hereā¦
ahh ok yeah. ground noise it likely is then. Sorry man.
Any way you can get it all on a common ground?
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Yeah, by getting rid of my girlfriend - cause having quite a lot of cables visibly lying around means WAR 
I think I try grounding the switch firstā¦
Japan doesnāt have a ground on normal outlets and the available ground terminals are not always common. I have to run my own from my airconās high voltage ground to a terminal block that I wire everything else from. I did this because floating ground hiss was driving me crazy.
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Yeah! I feel you!
Workaround is using WIFI for the time being. But of course it must be resolved properlyā¦
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Thereās so many crazy things about electricity in Japan. Half the country 50 Hz, the other half 60 Hz.
I worked for a kitchen appliance manufacturer. The Japanese consumer protection agency almost wouldnāt let us import our product because our brushed AC motors were labeled 110 V not 100V (or 120 not 110, whatever). They had thermal cutouts, passed actual testing, were designed around wide voltage tolerance, etc, and the only impact of running that motor undervolted would be lower torque/power production. The power on the packaging and in the manuals was correct for the lower voltage, there was no impact at all to anyone except the inspector who had numbers that werenāt identical.
They were also fine and maybe encouraged tossing those two prong to three prong adapters in the box, which nobody else in the world would consider safe to distribute to consumers.
My mind is still blown by this paradox.
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It drives me crazy.
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Is this the best way to setup? Have all the kit running from the same power outlet by way of an extension block?
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When I was visiting La Paz, Bolivia in the nineties some, or most, houses had both 110V and 220V supplies. You really needed to know which you were plugging into!
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It doesnāt have to be the exact same outlet or power strip but you want them all to be on the same ground. Usually in the US this should not be an issue. Other countries it varies.
Yes Iām pretty sure my entire house is on a common ground here. So I guess it shouldnāt be an issue.
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Iāve experienced this first hand when plugging directly into outlets at home vs a solid surge protector power bar.
The difference is remarkable.
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As far as I understand he does have a special place to be at gigs.
Donāt google it!!!
(Not a fan of him, by the way)
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Not a fan of him personally, either, but Rammstein have put on some great concerts over the years.