Slater
Headphoneus Supremus
The TRN BT20 actually fits fine in my ZS10 Pro, which has the same form factor as the ZSN. I just don't use the BT20 behind my ears as the IEM doesn't make a good seal, but other than that, it works fine and isn't heavy. I can walk around and they will not fall.
Actually, you just gave me an idea of what I can do with my BT20...