Loquah
Headphoneus Supremus
Thanks for double-checking.Just had a chance to try my A18t again, still using a single-ended cable (an older Effect Audio pure silver 8-wire design) because I can't find my balanced cables at the moment. It's particularly quiet because nobody else is home right now, so I shut off my AC and listened really carefully.
I still would have said it sounded completely silent, until I switched between the modes and discovered parallel is actually truly silent. Normal, active-g, and BTS modes have just the faintest, barely perceptible noise floor, that honestly is just about impossible to detect - until you hear the comparison with parallel mode.
To put it another way: listening with full size open headphones, the ambient room noise (even in my quiet neighborhood) is significantly louder than this hiss. The excellent isolation of a perfect fitting custom is the only thing that helps kill that ambient noise to where I can hear the hiss. Also hiss probably isn't the right word... it's so slight as to require careful back and forth switching to be sure it even exists.
Certainly some others IEMs will have louder hiss, like the previously mentioned Empire Ears, and others will be completely silent like my AME Radioso customs. So it really is a case by case basis but there's a decent chance it will be just fine for your IEMs.
You mentioned the display issue where the word parallel gets truncated to "paralle", and I realized that the Little Silver Fox actually has the advantage there:
Hadn't thought about Parallel being truncated. It looked like Active G took up the same amount of space, but maybe it's a character limit rather than a space limit as such