This ^^
In reality probly better off shooting for the max because after you figure in amp effeciency and imp rise you are not going to get what the amp says it can dobut to answer you question, you need to match the RMS not the peak. You do not want to run the peak power all the time because you will damage the subs. If the subs are 150w RMS, then find an amp that does 150. You can probably go as high as 175w and be safe but 300w would be way too much. Of course they may be able to handle it, I have no experience with those subs. Ask in one of the other forums and you would get a better answer.