I think this is a fine question! I would look into the materials that are used in the suspension, cone, and spider. Most good quality car audio speakers try to use materials that will withstand the extreme environment found inside cars (ie, the dead heat of summer inside a virtual greenhouse on wheels, the bitter cold of winter, and the constant vibrations of years of travels). So, if these speakers seem to be of good quality in the first place, and if they have been stored in a relatively controled environment, then I personaly don't see the problem with them even though they are not hot off the assymbly line. As with any speaker, you should not run them at full capacity for about a week or so to allow proper break-in. Use your best judgement with regards to what "full capacity" is. Anyway, run them at about 50% - 75% volume for the initial break-in to allow the motor assymbly to reach a normal operating temperature so that tiny air bubbles in the glues can work themselves out.