Pair up with X7 is good, very revealing and detailed, but a bit too much hissing (w/AM2) and sound is more sterile. I don't have Mojo, but heard plenty about it to get an idea that it has a smoother signature which should pair up well with Z-R. I wouldn't say that Zeus-R is very source picky, but the nature of its revealing signature not going to mask poor resolution of the source, though to my surprise I found Z-R to be more forgiving with poorly recorded tracks. I personally prefer Z-R pair up with more neutral/warmer/smoother sources which makes signature more balanced and lifts the low end.
yes with am3 the hiss is there and to be honest I never liked the am3 sound signature anyway and its a hiss monster as you can read in fiio x7 thread, but i use the am5 and i am happy as I do not experience the hiss or i did not pay attention to it, but if it was hissing I would have noticed it
now here is the thing with fiio x7, with the stock player of fiio x7 the sound is not the best with zeus R. But try to change to neutron and this immediately turns things around, the fiio x7 and neutron sounds simply great. It has been always known that stock player of fiiio x7 is different sounding than third party apps and I only liked stock player because with other iems and third party apps i did not get a good result.
As few of you know me I love eq simply because most of the music I like is mastered not optimally so I resort to eq to fix those short comings, and I was never satisfied with the eq in the stock fiio app, and with neutron it was getting me bad results with all iems, this totally changed now with the zeus r, and I do not know how with the zeus R I like neutron the best contrary with my other iems. The neutron is the best I heard with zeus r, and when I use the eq in neutron in fiio x7, I get the best sound I can get ( mojo aside ). I am so surprised how i can get the bass to punch big time using the eq in neutron, and keeping the mids intact and as great as they are in the zeus r. Now the price I paid for to get those extra details, is honestly the best I invested in, as I never enjoyed listening to music like I am now with the zeus r.
Now for bass lovers that seek quality bass I assure you all the bass is going to meet all your expectations and even more, that can be dialed in to your liking with eq easily as is the case when bassheads look for the extra bass with QUALITY, you can see from my profile I love bass, and this bass in zeus r is the best i heard
Now mojo takes things to few degrees ahead
So all in all I am happy with the zeus r using both fiiio x7 and mojo with mojo having the upper hand
