Thanks, I have the premium sound system pre FL. Had a look myself at the rear shelf pioneer 6x9s which are marked as 4ohm, would expect the rest to be too.
I've gone for 2 sets of audison prima speakers, one 16.5 set for front doors and 6x9s for rear shelf both rated at 4ohms.
I wanted to check originally as audison actually do a 2ohm option in 16.5 which would've been ideal had it been a 2ohm system, but that seems not to be the case.