Hi Gianluigi,
Thanks very much.
Before purchasing the CH gear, I auditioned in my system the same configuration that you own - an L1, P1 and an X1 with 2 output boards. What I found, at least in my system, that sharing a single X1 between the L1 and P1 was sub optimal and that I was able to achieve the best overall system sonics by dedicating the X1 to the L1 and using the P1 without any X1. If you do make the upgrade to both a full dual mono L1 and P1 with dedicated X1's for each box (meaning 4 X1's) the jump in sonic performance is very, very substantial. It is not a subtle change at all. The sonics that you are hearing now in your current configuration is really only giving you a taste of what is possible. I also think that if you simply added another X1 to your current configuration and dedicated one X1 to the L1 and X1 to the P1 you will also hear a very nice improvement compared to what you are hearing today. But again, the jump to the full dual mono configurations is sonically significant.
Hope that helps,
Arnie