You can run each sub at either 4ohms or 1ohm which means that two of them will run at either 2ohms or .5ohms....be careful how you wire them because most amps cannot handle .5ohms very well and might blow.....to wire them for 2ohms you will need to wire each sub the following way. they have two voice coils make a jumper wire connecting the negative on one coil to the positive on the other coil. what you are left with is a coil with an open positive and the other coil has an open negative. when both subs are wired like this connect the two positive terminals together (1 from each sub) and the two negative terminals together (1 from each sub) now the subs should be wired together at a 2ohm load. run the two positive wires into another combined wire which will run to the positive speaker terminal on the amp. do the same for the negatives