Peak Power is not what you think it is. 

Peak Power is essentially an advertising tactic for manufacturers to put a higher number on listings of their products.

Your subwoofer or amplifier is not actually capable of that power, it can maybe hit that level for a 3-5 second burst, but if you push a product to that level, it will likely break.

Never buy a speaker, subwoofer, amplifier, etc. because of it's Peak Power Rating.

Buy based on the RMS Power Rating.

If you're buying a subwoofer and amplifier, the RMS power from both should be the same, or within 5% above or below it.