amp, infinity reference 611a

Hey guys, this is my fisrt post on this site. I am fairly new to car audio. I have only done one system before and it was small. A 200 watt rms amp and a single 12" 200rms sub.

Right now I have picked up a Infinity reference 611a amp. Here are the stats: http://www.crutchfield.com/p_108R611A/Infinity-Reference-611a.html?tp=115

I have also scored these 2 10" subs in a ported box: http://www.futureshop.ca/catalog/proddetail.asp?logon=&langid=EN&sku_id=0665000FS10085249&catid=

Picked up both for $360. Amp is used and subs are brand new.

Heres my dilemma:

On the back of the sub box there is one connection. A 2 ohm - +

On the amp the speaker connections are - + - +

On which connection do I connect the sub box to. Is it the first set, the second set, or is it the first negative and last positive.

I have read the manual but I am still unclear.

Thanks.

It didnt make sense at first  cause @ 4 ohms there is one output of power and @ 2 ohms the output is much greater. Thats what I was thinking.

For example: So if I were to connect a single 4 ohm sub to either connection or a single 2 ohm sub to either connection. How does the amp know whether it is 2 or 4 ohms?

You have solved my problem but I am trying to figure this out.

I knew that the ohms was for th subs. What I didnt know is that the amp sees that load.

Thanks.

Finally installed:

For power and ground I used 4AWG. Th lenght of ground is 3 feet and it is grounded to one of the bolts that hold the seats to the floor.