Hello,
I was thinking of getting lsi 5.1 setup lsi25, lsic, lsifx.
Now I currently have a rmb-1085 but the newer 15 series has come out.
I am think of these options

1. Use 1085 with Avr as pre-amp (Yamaha 6190b ot Hk645)
2. Use 1085 with rsx-1570
3. Sell 1085 and buy rsx-1560
4. Sell 1085, get rmb-1565 rsx-1570

Would option 1 degrade audio enough to warrant a pre-amp or Rotel avr?
Woud there be enough difference to warrant a upgrade to an 1565?

Thanks for your help