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!
Stupid question.....
I have a 5.1 integrated which offers 125 wpc. My speakers cannot be biwired. If I run two channels into each of the + and - of my speakers, am I in fact running 250 wpc into my speakers? any danger for the amp? is there any risk to short channels by running two + into my speaker +?