Also have n30le and z1r. And also impressed with the sound. Was thinking of adding another iem to complement z1r (perhaps Trifecta). Have you tried any other iems with n30le?

What's is your favourite IEM for N30LE? Thinking of getting another pair of IEMs to compliment excellent in terms of soundstage and detail Z1R. Any suggestions? Happy to consider any price brackets, including flagships. Thank you.

I believe the second unit was from existing stock. If you would like to check your unit I find these track usefull: Silence - 5 min by Brett Black For me the hiss stops when I switch to solid state. Sony IER-Z1R with stock 3.5mm and 4.4mm cables Hifiman Edition XS with stock 3.5mm cable...

Tagging @Andykong for reference Replacement unit arrived (thanks to Andy and Hifonix). The new unit is also faulty - the same static noise issues as with the first unit which I returned. Prevalent low-level static noise, mostly audible when music starts or stops but over the music as well...

@Andykong Just got my unit and getting the same issues as described above. Low-level static noise in the right channel with tube mode enabled. Also very noticeable at the start of the songs and a few seconds at the end before tube amp switches off. Have contacted Hifonix as I also feel this...