Cap, you are confusing.
Dickmc, you have an 8-ohm driver. What is the power output of that amp into an 8-ohm load? That is your answer. Depending on the quality of the amp, my guess is 150-200w into 8ohms.
The choice of how much resistance (actually impedance is what counts) depends on how the system is designed. THere is plenty info already written,
like this .
