yes there will always be ohm flux, however there are two standard ohm rating when it come to speakers. I am not an expert by no means but this is what I understand about the ohms and how it relates to audio.
the two basic ratings would be 8 ohm which is most common in home adio and 4 ohm which is most common in high end car audio.
ohm is the amount of resistance that a speaker puts on a amp. the lower the ohm the more resistance, conversly the lower the ohm, the more wattage an amp is forced to put out.
for example
a amp rated at 100 watts at 4 ohms will put out 100 watts at a 4 ohm load, 50 watts at a 8 ohm load, but 200 watts at 2 ohms. now while this isnt always exact you can get a good baseline idea how it works.
when wiring multiple speakers you can follow this rule.
two 8 ohm speakers ran parallel will result in a 4 ohm load but ran in series will result in 16 ohm load the, if the amp is rated a 4 ohms for 100 watts and you ran a 16 ohm load you would recognize about 1/4 of the rated power or 24 watts under using the amp.
now this is where it get crazy, the bose sytem in the armada is closer to two or three ohms.
you risk burning up the factory amp by adding additional ohm load unless you wire in series or add high ohm speaker in paralell. you may be better served adding small after market amp.
heres where i mounted mine.