help me understand 4th order tuning

[GeekSquad 10+ year member]

Chamber volumes along with tuning affect bandwidth. Not one is really more important than another.. to truly understand it you need to take a look for yourself.

x2

You are asking the right questions; you just need to read up a little bit on your own.

The tuning on a box is kind of like an equilibrium point between the compliance (stifness) of the air in the box and the volume of air inside the port. Along with port area, these are the primary determining factors in a 4th order tuning ratio.

 

[Kangaroux 5,000+ posts]

OP I suggest getting winisd, entering in your subs specs and fooling around with the volumes and tuning. The higher the ratio between ported and sealed, generally the output will be peakier, but if you do something closer to a 1:1 ratio you get a flatter response that has better low end, while sacrificing some output. 45Hz should be fine for what you are looking for as that covers a pretty large range from 30Hz - ~65Hz depending on the woofer. Personally, I would design it in a way where it will play 25-60Hz or even 50Hz, and then deaden your door speakers up front and cross them over pretty low, around 70Hz. It's hard to get a good bandwidth without the highs sounding like trash, or sacrificing low end.

 

[05trailblazer 10+ year member]

i need to deaden my door speakers, see what kind of difference it makes.