I see. Then connect it like this:
(+)
|
|
-----------
| |
s s
p p
k k
| |
| |
s s
p p
k k
| |
| |
s s
p p
k k
| |
| |
s s
p p
k k
| |
-----------
|
|
(-)
Each speaker is represented by "spk" with the "s" side being positive and the "k" side being negative. The total impedance of the network is double the impedance of a single driver.