@OP. In my experience, the 509 does not sound as powerful as its rated specification suggests. You could try a Pass Int 250 for comparative purposes. If nothing else, it will demonstrate that not all competently designed amplifiers sound the same.
Best amplification for Magico S3 newer version on your experience
I purchased a pair of S3 but now I am facing that I might not have the funds for top brands amplification that I see them pairing at shows CH, Solution, D'agostino
Etc.
I come over here looking for advice.
Currently using Luxman 509x. My room is 18x12 and I listen to low to moderate vol.
Thank you in advance.