port length

[CHUCKmfnNORRIS 10+ year member]

whats the difference between a shorter port and a longer port?

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[randy8876 10+ year member]

the size

 

[CHUCKmfnNORRIS 10+ year member]

i ask because i am getting an enclosure for my sub and the manufacturer says to have 25-40 inches of port, does it affect the sound of the sub?

 

[miker 5,000+ posts]

Tuning freq.

 

[miker 5,000+ posts]

i ask because i am getting an enclosure for my sub and the manufacturer says to have 25-40 inches of port, does it affect the sound of the sub?

Theyre probably saying 25-40sq in port area.

 

[SpeedEuphoria 10+ year member]

they are referring to port area not length

length determines tuning freq, shorter=higher

 

[CHUCKmfnNORRIS 10+ year member]

this is what they have written for a ported enclosure.

1.75 cubes - 2.5 cubes, 25 - 40 Inches of Port, 28-35 Hz

and this is what they have written down as the average

2.00 cubes, 30 inches, 28-35 Hz

 

[SpeedEuphoria 10+ year member]

right the "inches of port" should read "square inches of port"

they are surely talking port area. The general rule is 12-16 square inches of port per cubic foot

the tuning is precise also and is determined by the length of the port

 

[RAM_Designs 5,000+ posts]

Port length is determined by three things

1) Box volume

2) Port area

3) Tuning frequency

Like already stated, they are giving you a suggestion as far as the size of the port area.