I'm about to replace the speakers in my 5150 combo with a Veteran 30 and a Reaper 50 from WGS and they have the option of getting a 8 ohm version and a 16 ohm version. I'm not sure what ohm a 5150 combo is but I've heard that I should get both of the speakers at 8 ohm to wire them in series to form a 16 "cab" so-to-speak for the "head" of my combo to run through, is this true?

I've never had impedance explained to me before, so its kind of vague to me right now, can someone help me out?
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