The two 12V outlets are specially designed to supply the big modeling pedals from Line 6 or other pedals needing 12V DC supply voltage, for example Room-Mate, Squeezer or Replica from T-Rex. The Double Jack is able to supply two Line 6 modeling pedals (remember the green type 4 Flex cables) and you'll still have approximately 300mA of current to supply your standard 9V pedals from Double Jack's outlet 1-5. Older BOSS pedals specified to run on the original ACA power supply from BOSS (the unregulated type) should also be supplied with 12V for optimal performance.
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