And just how are we supposed to know that little bit of information?
You'll have to find a review or technical paper for the speaker that shows the impedance swing of the entire speaker. Separate out the portions of the speaker above and below the crossover point(s) and determine what the average impedance of each section would be.
can i just hook up a multimeter to each set of terminals and find out that way? and if the speaker has a recom. of 20-200watts and my amp puts out 120 at 8ohm and 150 at 4, would it be better to bi-wire it?