Verified answer

First of all, double-check the power rating of the amp and make sure you're matching the impedance. When you combine two 4-ohm subs to a single amplifier, the amplifier's load impedance will be 2 ohms. Your amplifier probably has a higher power rating at 2 ohms than 4 ohms, so make sure the 250 watt rating is the 2-ohm rating.

That said, there is absolutely no problem using a 200-watt subwoofer with an amplifier that can only produce 125 watts per sub. The whole "under-powering is bad" idea is a myth. Subwoofers aren't damaged by clipping unless the amplifier is producing more power than the sub can handle. It's true that a "clipped" output contains more thermal energy than a pure sine wave output of the same amplitude; but as long as the sub can handle the power, the clipping alone won't harm it.

Well first I would need to know how you have it wired because it is possible that you could have it wired in a way that could be pushing enough power to each sub. Most amps if you wire the subs in parallel will deliver the exact same amount of power to each sub. In this case and based on the info about your amp you would be putting 250 watts into each sub if done correctly. And yes that would technically be 50 watts extra for each but that would be fine. As weird as it may sound having a little too much power works better than having too little power. I hope this helps and good luck. If not add more details and I'll try again with the new info.

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it's quite possible to clip your subs by under powering them i would consider getting a new amp that has a bit more power (400rms) if you do not get a new amp i would not turn up your head unit all that much to avoid clipping

you can actually trick you amp into thinking it is pushing a smaller some with the wiring but i need to know if they are dual or single voice coil