box porting question

[offroadbum]

Would it make a differance if the port is on the outside of the box.
A buddy an I were talking about an old box that was marketed years ago.But the box went under the rear dash with the ports running out of the box into the dash.Nither of us had ever heard one and we are just wondering if it would hurt anything.I`m sure it shouldn`t but you never know.

[SupraGuy]

I've done this with bandpass boxes, to get the port to go through the rear deck in a speaker location. I would not do this with a ported box, because there will be a baffle between the speaker cone and the port mouth (Rear deck & seat) this is likely to do funny things to the frequency response, which is not likely to be a good thing.

However, for just the port calculation, it is unimportant. The port length and area determine the tuning frequency, regardless of if the port is inside or outside of the box.

One thing though is that if the port material flexes, it may produce a resonance outside of the box which won't be pleasant. (PVC tubing needs to be reinforced outside of the box -- trust me.)

[offroadbum]

Well it did have flex tubeing.I think that it was made by stillwater(kicker).
I don`t think that I`m going to build one any time soon I`ve got to many projects going now.
But a freind of mine was talking about it for his old ford Galaxie.And I just could answer him one way or the other.So thats why I posted,just a little more education from you guys.


SupraGuy I,m going to your website to ask you another question later this weekend if thats alright?