in fact with a dual 2ohms...you can have 1ohm(parallel wiring) or 4ohms(serie wiring)
so the solution with your two BL are 0,5ohm , 2ohms orrrrrrrrrrrrrrrrrrrrrrrrrrrrrr 8ohms
to have 2ohms with your two BL ..... each BL wiring parallel (1ohm each BL) and wiring the two BL serie...
sorry for my poooooooooooorrrr english