You only gave us the model of the amp so I will make an assumption that your 12" subs are the Sony XS-GTX120LW. First, they cannot hold 1200 watts a piece. They are meant to be powered with 350 watts RMS. They will hold 1200 watts peak. That means that 1200 watts for a few seconds will be ok. Past that and kiss them goodbye!
Next you indicated that bridged the amp. Since the subs are both 4 ohm single voice coils did you wire them in series or parallel?
It sounds to me like you wired them in parallel resulting in the amp seeing a 2 ohm load. The amp you referenced is only stable when bridged at 4 ohms.
Has the amp begun working again once it cooled down? If not you could have fried the outputs by having the resistance too low.
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