You missed the point. You no longer have 8V across 4 ohms when you are bridged.
When it was not bridged it was 8V across 4 ohms for 2 amps. As you say, Ohm's law. Bridged you have 16V across 4 ohms so 4 amps. The difference between +8 and -8 is 16.
plus 8V------- 4 ohms ------- minus 8V so 4 amps will flow.
The 4 amps flows out of one terminal and into the other. If each terminal is developing 8V but supplying 4 amps then it is effectively a 2 ohm load. 8/4 = 2 = ohm's law.
Back to the original question, will this stress the amps? I think not. Your amp is capable of delivering a large amount of current as evidenced by the 1,600W rating into 4 ohms. Your ears would start bleeding before you got close to that limit. Try it and see how it goes.
When it was not bridged it was 8V across 4 ohms for 2 amps. As you say, Ohm's law. Bridged you have 16V across 4 ohms so 4 amps. The difference between +8 and -8 is 16.
plus 8V------- 4 ohms ------- minus 8V so 4 amps will flow.
The 4 amps flows out of one terminal and into the other. If each terminal is developing 8V but supplying 4 amps then it is effectively a 2 ohm load. 8/4 = 2 = ohm's law.
Back to the original question, will this stress the amps? I think not. Your amp is capable of delivering a large amount of current as evidenced by the 1,600W rating into 4 ohms. Your ears would start bleeding before you got close to that limit. Try it and see how it goes.