I agree with your statements from my own subjective assessment between Toslink vs coax S/PDIF of Node 2i, but was wondering if you knew of some recent objective news that make you say, “there may still be an issue with the Node’s Toslink out...” to confirm this.
I did many comparisons using the following setups:
1. Node 2i —> Qobuz & TIDAL —> Coax & Toslink —> RME ADI-2 DAC —> headphones
2. Oppo 205 (mConnect as DLNA controller, Qobuz & TIDAL) —> Coax & Toslink —> RME ADI-2 DAC —> headphones
The Node 2i only sounded as good as the Oppo setups when I sent the digital output via Coax to the RME ADI-2 DAC. I could set up a parallel test: the Node 2i —> Toslink —> RME, and the Oppo —> Coax —> RME, and then start the same song on Qobuz at the same time (BlueSound app for Node 2i, mConnect app for DLNA to Oppo) and then just switch the input on the RME (which has no delay or glitches when switching). The Oppo just sounded better (I’ll spare you the subjective adjectives/adverbs). Then I switched it up: Node 2i —> Coax —> RME, and the Oppo —> Toslink —> RME, starting the same song on Qobuz at the same time then switching inputs: no difference in sound quality. Sounded identical to me in “blind” testing using my girlfriend to change the inputs. So the Coax-out on the Node 2i was great, but the Toslink-out of the 2i didn’t sound as good.
Cheers,
Gus