Port tuning

[billfitzmaurice]

My rule of thumb is that you should not tune a bass cab higher than 50Hz and 40Hz is even better.

With 4 string 40Hz tuning is usually too low. That minimizes excursion at 40 Hz, whereas the power bandwidth has the most demand above 60 Hz. Even with 5 string best results usually come with 45 to 50 Hz tuning, which still gives adequate output to the fundamentals while giving the maximum sensitivity and displacement limited power handling within that 60 to 100 Hz bandwidth where power demands are highest.

 

[J42]

I was actually wrong, the 5" length puts me at 45Hz.