Regarding switches...
My configuration for some months now has stayed consistent, and comprises a 3-switch chain:
Upstream > Supra Cat 8 > (A) eR (A) > Sablon Eth > modded Buffalo > Planet SFP > sNH-10g > Finisar SFP > Extreme
The first 2 switches are powered by Paul Hynes custom SR-7 DR 12v rails, while the SOtM switch has an SR-7 DR 15v rail driving a dual-stage
DXPWR DXP-1A5DSC with output 12v.
My “network off“ action consists of powering down the DXPWR. This powers down the fiber link connected to the Extreme.
I'm exploring 2 questions wrt the network:
1. What is the impact of the network ON vs. OFF with the new USB card in place, for LOCAL playback?
2. What is the impact of the "full monty" 3-switch chain vs. a simple connection to the upstream, for STREAMING playback?
This post will address question 1. In essence, this is evaluating whether the
presence of the network affects SQ during local playback, which does not actually require network access. For this test, I used
TAS > HQP/NAA as the music player.
Results
There is an impact.
Admittedly, the delta is quite small. Listening to the song Ay Candela from the Buena Vista Social Club, with the network off, there’s a slight sweetening of the sound, i.e. a slight reduction in harshness, the percussion (maraca?) becomes more coherent, individual voices snap into better focus.
Again, the difference is a few %, say 95% with the network on to 100% with network off.
For most situations, I don't bother to turn the network off any more, but when I want to really immerse myself in a piece of music, I can still squeeze a few more drops of sound quality by turning the network off.
I'll report on question 2 in a day or two.