[Giller]

Hey guys, my brain is stuck. I have a 4 ohm kenwood deck, want to wire in two sets of rear speakers, two speakers on each side. Speakers are 4 ohm, so will have 8 ohms total on each side. Do they need to be wired in series or parallel? I was thinking parallel so would total 2 ohms each side.....but audio guy mentioned series?
Please advise. Thanks!