Just trying to wrap my head around the compression of dB/SPL. I measure stuff on an FSMR 26N regularly and wonder how it works.I haven't measured OI, it's not clipping it's just noticeably flatter and less dynamic. IMO the charts prove alterations to the sound in my scenario when IEmatch is engaged. Your experience may very well be different - I'll point out the obvious and say this piece of kit wasn't specifically designed for highly sensitive IEMs, it's just got IEmatch on there so it'll work with them. It's really not a showstopper for most users. Looks like you've got a solid CA collection though, so if those are your primary prospective purpose for the Gryphon I personally wouldn't recommend it. Also, on the 660S I had a slight preference for the iDSD BL over the Gryphon even when using the 4.4 - My main headphone is the K712 so I mostly judged from this headphone in which the Gryphon was fantastic.
Anyhow I was hoping this could be an end game upgrade for mobile (not getting a Cayin Tube portable lol) I currently use a Qudelix 5k for walks and the gym and that's good enough for LDAC OTG.
Looks like it could use a revision but it's already in production so that's unlikely. The Cayin RU6 looks spicy but has no Bluetooth. So I shall wait!