I Removed the Ifi DC blocker and was surprised mine Hypsos where still as quiet so maybe i don't need it in first place.I measured it a 12 midnight in a quiet room with a SPL meter I use to check the level of HPs. Placed it on top of Hypsos and the difference between off (room level) an ON was ca. 3.4 DB... 34.6 vs 38! So little that someone from Fe meant it's surprising that I hear that.
Still bothered me.
Wouldn't it be funny if those of you with same "issue" would have the same positive result also by just applying pressure on it's top and that humming is gone?
No power/transformer issue just the case vibrating... just saying (again)! wouldn't cost anything... no need to by power filter/DC blocker!
Also It sounds like the ifi dc blocker hamper the dynamics of Ferrum Hypsos/Oor. And makes it brighter, more sibilant and less natural sounding. Bass is deeper and more rhythmic without it and it sound warmer. Though it might sound cleaner and more articulate with it and tighter bass(maybe fake bright details? ). But i prefer without it right now.
The one i used on the Hypsos is only rated 4A continous and 7A Max. I have another that is rated 7A continuous and 10A max that i use direct on my Niagara 1000 powerstrip inlet and is only for Tv and apple Tv4k, i think it result in cleaner picture there. So there is different versions ones floating about on the market.
I know they have a new ifi DC blocker + rated 10 A continuous.
I would recommend the lower version Ampere versions at least only power Digital equipment that don't need the raw power. Dacs like Wandla might need that raw power from Hypsos though just like an amp. Although my hypsos show it only use 0.7 A on the display so 4A/7A would seem enough but maybe not in reality somehow.
I think i move my 4A/7A version to my powerstrip inlet that power my router and switch. And listen for what that might bring.
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