It was a very unorganized stream of conscience on my phone, LOL, and could go in depth a bit more in the next couple of days.
My love for RS8 lead me to N7, where they share sound similarities – natural resolving and analog tonality with a very subtle coloring, big soundstage – with N7 having an edge in treble rendition – natural, revealing resolution and layering without brightness.
N7 was my go to when I was in the mood for slightly more details or local DSD playback where N7 excels. Not that RS8 doesn't excel in local DSD playback, N7 was designed for 1BIT DSD playback and PCM conversion/upscaling while bringing a variation Cayin's sound, tuning and technicals at a lower price point. Perhaps Cayin could have squeaked out a bit more amp power with N7 – it's not anemic with easy to drive IEMs and low impedance headphones but more juice is always appreciated.
N30LE is Cayin's "best of" in one while scaling up technical performance and Cayin's expert sound tuning. It has that natural resolving and analog tonality, dynamics and layering without analytical transparency, and variations of Cayin's sound and coloration with triple timbre modes.
Since you're enjoying N7, focus on your priorities and if N30LE is a preview of future Cayin's products, there's no rush to upgrade. I'm crossing my fingers for a C9mk2 with Tube Classic timbre