Upgraded internals through and through P15 over P10
there should be a marked delta in soundquality between the 2.
Don’t sell the P15 short due to power range loading…
As an example to this with P12s I will give a link to an
amazing read of a poster who was running a P12 to
power to 2 Emotiva XPA 1s in Class A mode 60 watts
Class A plus a Plinius Class A power amp and his entire
system of the one P12 …P12 took it all in stride no problems.
With your system I don’t think the P15 will break a sweat…
Here is the link…read through scroll looking at all the pics
of his P12 screen shots and equipment …
Enjoy the read, happy journey
Best wishes