FilziSH

Just for the record. A few days ago I bought a Peavey 112-6 cab with Celestion G12M Greenback dyn and connected HX Stomp directly to it. Result: sounds like total crap :D Extremely quiet on max volume level and very thin and lifeless sound, also impossible to play on high gain, really hurt for ears

OK, I have response from support : I guess the question is closed :)

I made a video. Sound was recorded separately on a recorder with a high input level, because through the phone mic this hiss cannot be heard. Also I use hard limiting, so keep in mind, in fact the sound is much quieter https://youtu.be/k1s76lzY4bE

Sounds creepy actually... o_O Could this problem be caused by a faulty DC-3g adapter?

The device heats up, but I don't know which heating temperature is considered as normal. I wouldn't say that "very"

Exactly. It's very weak, almost inaudible. But it is. If you bring your ear close to the HX it sounds like hiss from speakers or tape hiss

Is it normal that a small hum comes from the device itself? I know that HX is heating up and this is normal, but nothing is said about the hum anywhere.