I have tried the silent angel N8. With Audio grade Atlas Hyper Ethernet cable. Compared ripped CD to original CD (same recording and mastering). CD player is 30 year old Technics connected RCA and optical to my NAD C658.
That means pre-amp section and downstream also 100% identical.
Did A/B/C listening.
A: cheapest 8 port Gbit switch with standard power brick and Cat 5a twisted pair unscreened cable.
Upstream:
iMac server. Cat5c to Router Cat6 to 16 port switch Cat5e to Silent Angel N8
Cost:
0 EURO, as I owned it already
B: Silent Angel N8 with supplies medical grade power brick and Atlas Hyper Ethernet cable.
Upstream:
iMac server. Cat5c to Router Cat6 to 16 port switch Cat5e to Silent Angel N8
Cost:
800 EURO (that is the same as a brand new NuPrime CD transport or half way a decent subwoofer)
C: Silent Angel N8 with supplies medical grade power brick and Atlas Hyper Ethernet cable.
Upstream:
BlueSound Vault2 Cat6 (screened, twisted pair) directly to Silent Angel
Cost:
2000 EURO (now we get into really fancy CD Players/transports or very decent subwoofers)
D: CD in 30 years old Technics TOSLINK optical digital Atlas Element interconnect.
Cost:
0 EURO, as I owned it already
A-B-A-B-….:
No matter what time of the day (hearing fatigue) or what day or what music. No difference at all.
B-C-B-C-….:
iMac with multi node upstream and standard cables won.
B-D-C-D-….:
The 30 years old Technics Won.
Now it is not day and night differences, they are audible and consistent. Multiple people even blind listening.
Conclusion:
BlueSound Vaulr2, Silent Angel and Atlas Hyper Ethernet went back to the dealer.
I use streaming, a lot, for its convenience. Really quality listening is CD and Vinyl. The sound differences are forgotten when not listening in direct comparison. All SQ is very satisfactory already even streaming.
There is no way I am going to invest a single penny in „audiophile“ switches. They do not work for me.
In my living room sits a M33 with my 10 years old Yamaha BluRay Player connected via Atlas Element TOSLINK optical interconnect and Thorens TD105 turntable enabling streaming through the house, also vinyl.
The convenience of the BluOS streaming well outweighs the subtle loss in SQ of CD.
When I have time and mood, I put a record or CD on and enjoy and have piece that I am in the privileged situation that can do it all without feeling the need to go way over budget and invest in „audiophile“ switches.