Magnepan 1.7 crossover capacitor improvement?

Silver is right...what else you using?

That being said...the development of the LSA Statment Loudspeakers was a primer on 'how to' improve.
I think back on the old statement....'Everything matters...makes a difference.'
To the extent, Kevin Hayes an old friend puts, not only upgraded wire in his designs (preamps for example), but uses different types in different locations.
It's not as if there's a manual that says, OK, use X wire between this and that, then Y wire near the power supply, etc.
It's trial and error Davide.
Certainly changing the caps to better quality will allow you to hear more, have greater musicality from your system.
To help us...let us know what you're using...we'll be nice...putting a system together that sounds just right is an adventure...at least it always has been for me.

Let us hear from you.

Larry

Joe, (Silver)
Terrific advice.

There's something else here that has to be understood.
As axiomatic as it seems...patience with the break in is critical.
What you hear in the first five minutes, should be your system from the other room.
DO NOT LISTEN WHEN YOU FIRST MAKE CHANGES. As hard as that is to do, it's essential. First impressions are silly, and wrong.
The caps have a long, long break in...the better they are, the longer it seems to take.
I remember a moment during the LSA's Development (statement)...'What have we done? This is sh*t).
That's because I didn't heed that basic idea. Do NOT go for first impressions.
Let it cook for hours. It most likely sounds ok for the first hour, then goes south...changes character millions of times before, after about 200 hours of playing time...beginning to sound as it can.
Joe has given you GREAT advice.

Good luck...use patience Grasshopper.

Larry