I also share your experience that a full speaker amp is better than the Ferrum (which I still really love every time I test with the Susvara). I personally use a Moon 330A speaker amp and find it works best for me with the Susvara (marginally better even to my beloved Auris Nirvana)It's always interesting to find we all hear differently (well, accurately speaking, I sometimes hear drastically different from most others). I do agree and can confirm that Ferrum OOR is very solid and got a good impression -- but not necessarily with Hypsos.. I personally preferred that amp wo hypsos.
But when ABed I found myself favoring AHB2 better in all the very exact criteria. Later I found LA90 met my requirements albeit sounded differently and I'm fully content with how the amp drives my Susvara. I'd also comment my taste and flavor can be unusual -- for example, I really liked how Akitika gt-102 sounded with Susvara. I couldn't find anyone else who agreed with me to date haha.
I think my weirdo-ish preference and expected financial gain (cost saving) biased me a lot. I don't seem to necessarily agree with general opinions toward typical recommendations when I actually heard (didn't hear a few super uber ones such as ef-1000 but that's out of my budget + I want to avoid high-heat amps anyway), either. @ZzZzZzZ should take a grain of salt in seeing my claims. There are less disputable options you'd like to check out.
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