Nice setup Martin, very neat n tidy. Bet it sounds awesome!
About Jriver digital volume vs Preamp...
Jriver's internal volume is as good as it gets imo. In my experience you don't lose any quality.
Its ideal if you want to use a smartphone or tablet to run Jriver.
FROM JRIVER SITE:
All audio handling inside the program is done with 64 bits of precision. Most high-end hardware uses 24-bit output, meaning the engine has an additional 240 dB of precision above the hardware's output. As a result, should you choose to use them, digital volume, room correction, and other audio functions are pristine.
Why not try it, see what you think? The convenience is great.
There's a great thread about this over on the Jriver forum HERE:
http://yabb.jriver.com/interact/index.php?topic=76912.0
AC POWER
Hardwired 10kVA balanced mains powering entire system
AMPS
Meridian 557 power Amp (Modded) / PS Audio BHK Preamp (Modded)
SPEAKERS
Wharfedale Evo 4.4
DAC
PS Audio Directstream (Modded)
TURNTABLE
Pro-Ject X8 balanced output via XLR / Ortofon Quintet Blue cartridge
PHONOSTAGE
Pro-Ject DS3 B balanced Input (TT and Phonostage powered by Pro-Ject Power box RS2 linear psu)
DIGITAL
OPPO 203 (Modded: Linear PSU, i2s output to Dac) - Roon Endpoint, HDMI input used for all things Streaming/ PS5 /AppleTV ... also good for movies apparently?
MUSIC PLAYBACK
Tweaked AP-Linux based Roon Server into Oppo 203 as Roon endpoint
Ipad Roon Remote.
Apple Music/ YouTube via AppleTV, fed to Dac via Oppo HDMI input/i2s output to Dac.
SPEAKER CABLES
Biwired: Duelund DCA10GA (Bass) Duelund DCA16GA (mid & treble) Duelund 12DCA used as jumpers (On "Blackcat Cable" Chris Sommivigo's advice - yup, even with biwire it sounds better - and it does)
INTERCONNECTS
All Balanced: Ghost+ recording studio XLR cables