Hi shaolinwhat.
Your 4 ohm (minimum load) amp and your 4 ohm cab are, as you already understand, properly matched.
I only responded to your post yesterday since you seemed to be wondering what the 'speaker out' jack on your cab did.
In an effort to simplify the use of their amps, some amp makers label the speaker jacks on the back of their cabs "speaker in" and "speaker out" in the seeming assumption that their customers can't grasp concepts like parallel wiring.
IMHO this does nothing to encourage a customer's understanding of the technology they use and typically breeds confusion.
I just wanted to insure that you weren't thinking of connecting a 2nd 4 ohm (parallel-wired) Bigfoot 212 to your 4 ohm (min. load) amp.
In a parallel circuit: a 4 ohm cab + a 4 ohm cab = a 2 ohm load.
Connecting a 2 ohm load to an amp designed for a minimum 4 ohm load = an injured amp & wallet.
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