Hmmm, unfortunately, parallel resistance don't work like that.
The formula for working out parallel resistances is
1/RT = 1/R1 + 1/R2 + 1/R3.............
You add the resistances together in series, not parallel.
Seeing as these are speakers and you are talking about an audio system, i believe these values of resistance are impedance....a mixture of resistance toward current coontaining capactiance, resistance and inductance.......and I don't know a huge amount about audio systems but I though you had better results if you matched the impedance (impedance matching).
So I am assuming it will work, but I am not hugely experienced with audio systems.....so take my advice with a pinch of salt....
Matt...x