The box I fabricated for my 330ci was designed for proper fitment and optimized using Bass Box Pro.
Using the database in Bass Box Pro, the specs for the driver are as follows:
Based on the initial design and tweaks to the box based on tweaking the numbers in Bass Box Pro, we arrived at the following waveforms for the box:
As you can see from the graphs, the maximum dB’s are generated between 30 Hz and 100 Hz, with maximum power being generated at 30 Hz, which suits my needs perfectly.
The next two graphs describe the physical displacement of the driver and the velocity of the air as it leaves the box.
The vent velocity stays far below 34 m/s, which is the general standard for vent velocity.