upgrade advice

Looking at the update process of the sim audio mind its crude compared to the bluesound node 2.  I would agree that the internal DAC of the node 2 is not great however, it will play MQA which many external DACs will not.  Connecting the node 2 to a higher end external DAC will definitely an upgrade.  I have my node 2 going through a Wyred Remedy to a Modwright Elyse DAC and it sounds amazing.  The node 2 will stream CD quality from Tidal and HD tracks you may have on a local NAS, Sonos players will not stream HD.

sim audio is a streamer without dac so i thought its a good option to connect it to the hegel internal dac. a future upgrade can be buying external dac instead of hegel internal or upgrade to hegel h360.
buying the wyred remedy is a bit problematic since i have to spend $400
without trying it first since there is no dealer at my country.

What exactly is different in your set up to the store you listened at? If you purchased all the named items from them (Spendor, Hegel, Bluesound, Vovox), I’d look at everything else first. If the dealer has/had the same set-up I’d think they’d have the best suggestion as to where to start, but your room (over or under-damped), speaker placement, ’clean’ power & your cables are all going to be--and remain--influences regardless of what else you change.

the Bluesound's DAC is fairly decent, but not close to the Hegel or the Spendors, which are both quite good