These are great subs, that slam for the price... I have seen several complaints about these being junk, and they simply aren't at all. You have to stick to the continuous rms rating for these.. If you overpower them, they will not last, simple as that!!! I have a 1200 w mono amp running to these with the gain less than 50% and they SLAM!!! Don't be fooled by bad reviews, these are an extreme value, and i highly recommend them!!!