OPTIMIZING A PAIR OF TRIANGLE ANTAL SPEAKERS

Hello Guillaume,
First of all, if your Antals are part of the 202 series, for me it's the best from Triangle in terms of performance, not much to do, you can enhance it with a turntable and an amplifier with a higher signal-to-noise ratio.
Regarding the sound quality:
First thing, decoupling point.
Then bi-amplification, meaning you will power the bass and the mid/highs separately.
You need to be careful with the speaker wiring and audio connections; it only takes one wrong choice of an element for the sound not to meet your expectations. It's also important to know that we don't all have the same listening preferences. For example, for my part, with your Triangles, I would have chosen a very audiophile Marantz CD player with a Nad amplifier that has a very smooth sound, a very open stereo image, ample and deep bass, reproducing all types of music in extreme softness, not forgetting the cables that go well with this setup, Real Cable, they do wonders.

Have a nice day!