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Acoustic B450 adding extension cab

So. I was looking to downsize from my 4x10 halfstack and found this little ditty. I want to put an extension cab on the opposite side of the stage (ing area) so my guitar player can hear better (tells about our state-of-the-art monitor system). The B450 has a second speaker jack. So here's the question: The thing is 4 ohm out of the box; If I plug a 4 ohm extension into the existing jack, will it create a 2 ohm load causing the amp to boost to 600 watts? I have two 8 ohm Eminence and could wire in series or parallel.