Big round port question

[jj53913 10+ year member]

I am building a box and have always liked the looks of bigger round ports. If I can find some I was woundering what you guys thought about 2 12" round ports for ruffly 20 cu ft (before displacement). I am biulding a box for 2 DP 21's and IA recomends 120 cu. in. of port and a 12" round port would be 113 cu. inches.

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[dman4486 5,000+ posts]

are you asking if there is such a thing as too much port area?

 

[jj53913 10+ year member]

No, I have never used round ports and was wouldering if the ports being that big around would cause any problems and being just a little under on cu. in. in the end. It would only be 226 cu in. but I remember reading that round ports are a little more efficent that slot ports so you can get away with running a little less port area.

 

[mlstrass 5,000+ posts]

I just finished a box for 2 21's. 18cubes with 2 10" ports tuned to 34Hz. SLAMS off 2 1500D's...

 

[SicAudio 5,000+ posts]

actually slot ports are more efficient than round, especially for spl. thats why people use slot ports, they retain most of the sq and boost the spl by alot.

 

[bunkerking09 10+ year member]

actually slot ports are more efficient than round, especially for spl. thats why people use slot ports, they retain most of the sq and boost the spl by alot.

****?

 

[jj53913 10+ year member]

now I am not no stereo pro so I am probobly wrong but I thought a round port was more efficiant because the air actually passes over less surface that a slot port. and a slot port is a big plus on a support part of the box.

 

[jj53913 10+ year member]

Well when I finish the box I will see where I sit on cubes but if I end on the small side I mite have to try 2 10" ports

 

[bread0710 10+ year member]

now I am not no stereo pro so I am probobly wrong but I thought a round port was more efficiant because the air actually passes over less surface that a slot port. and a slot port is a big plus on a support part of the box.

so did i //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif