ROTEL 10 vs 15 series

[Zealot]

I would like some opinions and thoughts of those whom has had the privilege of owning or listened to, on the differences in sound quality/character between the 10 and 15 series power amps please.

Specifically these:

RB-1080 vs RB1582
RB-1090 vs RB1590
RMB-1095 vs RMB-1585

Thank you for your time.

 

[BiZKiT]