Picking a speaker based on stated frequency response is a bit like choosing a vehicle based on how fast it can go. If you need to haul concrete blocks, a Ferrari is probably not a better choice than a 1/2 ton. The point being that there are a variety of more important specifications that matter based upon the application, like how well the driver matches the volume and tuning of the enclosure, efficiency, linear excursion, etc... Lots of 12" drivers will make sound, if that's all that matters, but most will be sub-optimal in this particular application. That's what others are trying to get across above.