It depends. You want to look at rms ratings, not the peak ratings. Some amps increase in power when bridged, but usually not a whole lot. If this is running to a sub @ 4 ohms (I'm assuming this is as low as it can go), you may not ever see that full 300w because of impedance rise. My point being, even if it is a little more powerful bridged, you should be ok. What kind of amp is it?