Port length in straight vs. L vs. S port

[swangin68 10+ year member]

with all the cubes, and port area the same, what is the difference and cause for having a L port or S port vs. a straight port? also when u do a L port what does making the back port of the L longer or shorter? seems as though it would restrict the sub more by going across the rear of subs and allow it to have better power handling, or is there more to it, and the reasons for doing it either way? ive been wondering this for a long time when making boxes.

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[swangin68 10+ year member]

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[swangin68 10+ year member]

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[swangin68 10+ year member]

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[rmzsuzuki89 10+ year member]

The "L" port is for when the port is longer than the side that the port is on. So to get the desired port length, it has to bend, making the "L" port.

 

[chillin 10+ year member]

you make an L when you cant get the length needed from a straight port. Also you dont want the opening of the port too close to the sub from what ive heard. Cant give the exact reason though, something to do with the not having space to build proper pressure or waves i think. Dont really understand your second post.

 

[RAM_Designs 5,000+ posts]

I hardly ever have a straight port because my ports are normally too long for that. But I stick with a L port unless the port opening inside of the box would be too close to the sub, in that case I'll go with a U or S shaped port to keep it all on one side of the box and allow me to safely place the sub away from the internal port opening.

 

[Vossy 10+ year member]

Your post doesn't make sense to me

 

[SpeedEuphoria 10+ year member]

its all the same, length is determined by tuning. If you tune low you need a longer port, if you box is not very long on the side of the port then you need to bend it into an L or S or U to get the length determined by the tuning Fs

 

[swangin68 10+ year member]

well ive been using re calculator, and u can tune low with a short straight port, was wondering whats better the L or staright? when u get the same tuning out of each?

 

[RAM_Designs 5,000+ posts]

well ive been using re calculator, and u can tune low with a short straight port, was wondering whats better the L or staright? when u get the same tuning out of each?

Port length is based on three things.

1) Box volume after displacements

2) Size of port opening

3) Desired tuning

Keeping the other two variables the same, a smaller box, larger opening, or lower tuning will all require a longer port.

 

[benzmansl65amg 10+ year member]

Transmission Line port is the S your are referring to

 

[swangin68 10+ year member]

Port length is based on three things.
1) Box volume after displacements

2) Size of port opening

3) Desired tuning

Keeping the other two variables the same, a smaller box, larger opening, or lower tuning will all require a longer port.

exactly so what if i had all parameters the same at 32 hz with a 3" wide straight port at 16 deep, and a 5" wide 30 " deep at 32 hz requiring the L in the box. whats the difference

 

[RAM_Designs 5,000+ posts]

exactly so what if i had all parameters the same at 32 hz with a 3" wide straight port at 16 deep, and a 5" wide 30 " deep at 32 hz requiring the L in the box. whats the difference

A bigger port.

 

[RAM_Designs 5,000+ posts]

Transmission Line port is the S your are referring to

Not necessarily. In a TL the entire box is a port, or there might be a small loading chamber. I've used ports with dual 180* turns before(S shaped) in a normal ported box.