Went had a look at jbhifi asked him the same question he came back with a very similar response.. my 2 x 12" atm are 4ohm stable so if i wire them as per diagram i should have a 2ohm connection correct.

 

 

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Yes. Two 4 ohm subs in parallel becomes 2 ohm overall.

http://www.bcae1.com/spkrmlti.htm