A) You won't get any more than 125 Watts per channel that way. The two channels will not add together like you're thinking. B) Yes, it could damage the amps... Definitely a bad idea!
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I think not only "could" it damage the amps, it will certainly do so. Even if that weren't the case, does your amp have the ability to run "left channel", for example, into more than one of its amp modules? If not, they you would just be getting the 'surround' info with the 'extra' channel and that won't do you any good anyway.