If you are looking at a bit more wamrth, I doubt going to the Rhea is going to do it. The PH3 is quite warm sounding and the Rhea will add more apparent detail with a nice warm bottom end. I would look at upgrading the pre-amp first as the LS25 is very detailed and will add brightness if your system leans that way.
ps the loading is very system dependant, I currently have my helikon loaed at 47k and it sounds nice and extended, with my old speakers it had to be loaded down to 100ohms.
ps the loading is very system dependant, I currently have my helikon loaed at 47k and it sounds nice and extended, with my old speakers it had to be loaded down to 100ohms.