what do you mean by a 1400? are you talking about a qsc model 1400? if so then your information is not correct. i own one that i used to use for powering my stage monitors. the documentation for that amp states that the minimum load for bridge operation is 8 ohm at which point it puts out 600 watts. that series of amps also do not have clip limiters, and therefor you run a pretty big risk of blowing something up if you get carried away. this is why i retired mine from monitor duty. modern amps with limiters are a much better choice.
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bridging also increases distortion and power draw and generally makes the amp much less stable.