Newmar radio speakers in my coach's were wired overhead cabinets each side in parallel with the kitchen speakers .
The fade control on radio controlled the bedroom speakers.
I change that and placed the kitchen speakers off the fade control for a more balanced sound off the radio, its a matter of breaking the parallel wired front speakers, I think I instructed on how to do it, haven't been there in a while.
I change in some coach's the over head cabinets to a AR' company speaker never worried about ohm's or impedance.
Down near the bottom of
QT's 1 & 2 you will find information of what I did when I installed a DVD surround system, but the pictures may help you when it comes to wiring for your high-fi set up.
Not sure how much room you have in side cabinets or even if you have them, if you just change them out to quality speakers for more balanced sounds, the kitchen you may just leave alone they are behind you.