Quote Originally Posted by GM View Post
It takes a considerable amount of added weight referenced to the driver's moving mass [Mms] to make any major change, so the more accurate the added mass, the closer to hitting a target set of specs. For example:

12" driver/40 Hz Fs/0.4 Qts/60 L Vas has a Mms = ~78.4028 g. Adding this amount reduces Fs/SQRT[2] = 28.28 Hz and Qts increases by SQRT[2] = 0.566, SPLeff. drops by a factor of 4 [~6 dB].

Since the motor will run hotter due to lower efficiency, adding a cooling vent seems a good plan, though if used in a MI app it may not sound 'right' anymore.

GM
2.77 ounces? I don't know what MI app means, but it is a base reflex box.