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tifune,
I have heard it is bridgeable, but never needed to look into it myself.
I just left one channel unused when I had it hooked up for the short time I used it.
Nothing special needs to be done other than to feed one input in phase and other input out of phase. You then connect your speaker to only the positive terminals of the amplifier. You can turn one XLR output from your source in to two with a XLR splitter and then use a custom cable to swap wiring of pin 2/3 on one side to invert phase. If you are not comfortable making your own cable blue jeans cable can make you one.
Below is the relevant excerpt from the Hypex datasheet.
I use two NC252MPs bridged for my subwoofers and they work great.