Focal sopra 2/Gryphon Diablo 300 not good match

Sounds like most Focal Speakers I have heard.  So now you have a decision.  Chase changes, modifications to your system to make them tolerable to you.

Or sell them to someone who loves the Focal Sound (and nothing wrong with that) and go find some speakers you love.

Otherwise... I'd be thinking Tube amp or pre-amp, or integrated.

Most of us here have had a speaker we just don't love.  Many of us (me included) have chased system changes to tolerate them and try to love them.  We post about the changes...

... but in the end most end up changing.  

So a server, who’s primary job it to provide "bit-perfect" data to a DAC... is going to fix a bright speaker? (more accurately, a speaker that the OP finds fatiguing, most commonly known as bright).

Good news is that Covid should disappear any moment now.

If the server doesn't help,  maybe throw a boat load of $$$ on cables and see what that does.

Or, you could sell/trade the speakers, take the money from the magic server and cables and buy a pair of kick ass speakers you love with your current gear. You have a killer Gryphon, and speakers that are regarded as quite good (you just don’t love them, and thats OK, someone else might, that is also OK)

I’m not saying run a commodore 64 and lap cord for your server and wires, but come on...

If you REALLY wanted to throw money at electronics... find a way to run some top end DSP/EQ in your system and see if you can tweak it.

But if you don’t LOVE your speakers, you won’t ever love your system.

The Focal is regarded as a good speaker, you just don't love it. It will sell, you will find something you like... If you dropped the cash on the Focals and the Gryphon the hobby is important to you.  Enjoy it. Only live once.  Go get some speakers you love.