Joined the BTR5 club this week. So far I’m digging this little device.
A question to the owners w.r.t. the 2.5mm socket. I was suspecting a channel imbalance towards the right channel (maybe 1 or 2 dBs – not much). Darn, have to return this thing, I thought. Started fiddling around… Changed the (modular) plug to 3.5mm and it was dead center. WTH… 
Changed the plug back to 2.5mm once again, and… Dead center. 
Started pressing the plug more firmly into the socket… BAM… Imbalance. Pulled it back a little (micrometer level)… Dead center once again. It’s a hardware issue.
Anyone else experimented this? I mean, 2.5mm is not the most robust connection in these days but am just trying to collect more info out there. Still have a few weeks before the return window is gone. Or, maybe I’ll just live with it.
Thanks! Cheers. 