It won't be the cones that matter, it's the suspensions, the bits you can't see that most likely really count. As mentioned before, the cheaper and "rougher" the build the more the suspensions need to be conditioned thoroughly, every time you're aiming for a serious listening session. At times I've heard speakers with premium drivers, well done in this area, and you can hear what you're getting - even with the electronics cold and pretty rough, the speakers are pumping out lots of "detail" - extremely simple, "audiophile" recordings come across well, but anything with some complexity in it is a mess, because the electronics haven't got their act together yet ...