Can someone take a look at my system? Suggestions?

Hello, new here. Ive got a kenwood 5700 that i run line level into a bic f12 sub, then out to a set of old altec speakers. Im wanting to replace those speakers with a pair of elac uni-fi ub5’s. Am i going to have any problem with these being 4ohm speakers. The bic sub is 8 ohm. The kenwood specs show its good from 4-16 ohm. Any advice would be appreciated!