What is meant exactly by the description 'more musical'?

Musical means it sounds right. Isn't it obvious ? 

there are 4 pages of posts here, so perhaps not so obvious...

Musical means it sounds right. Isn’t it obvious ?

Musical means acoustically right ...Because here we speak about sounds not about music per se ...

Something can be musically right , as the Furtwangler interpretation of the Bruckner symphony under bombs in 1945 Berlin and be acoustically wrong or defectuous or lacking ...

If you suppress the word acoustic , the meaning is a common place like : " i like it because it is my taste as an argument of a  5 years old arguing with his mother " ...

better music. that is what you try to get from your system that you built up.

better music not better sound :) 

I am with @decooney 

"musical" for me is when a system or live performance is engaging, non-fatiguing, and very pleasant to listen to.  You'll know when it draws you in for more. 

For me, the key to his definition is the inclusion of "non-fatiguing, " which is conjoined, necessarily, with the other qualities on his list.