2 Fi Sp4/teams 18s in a wall.

[Mercede]

I have 2 Fi sp4 18s that are in a walled Lexus sedan. They are the Sp4/Team 18 hybrid ones. The wall is about 21 Cubic feet without the port or anything. That is including the 3 layer baffle and everything else besides the port. I am looking to have it tuned to anywhere from 28hz-35hz. Could someone please help with the port size I should have?

Thank you.

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[Popwarhomie 5,000+ posts]

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[Jeffdachef 5,000+ posts]

I have 2 Fi sp4 18s that are in a walled Lexus sedan. They are the Sp4/Team 18 hybrid ones. The wall is about 21 Cubic feet without the port or anything. That is including the 3 layer baffle and everything else besides the port. I am looking to have it tuned to anywhere from 28hz-35hz. Could someone please help with the port size I should have?Thank you.

just do an 18 inch sonotube thats 30(longer if you want lower tuning) inches long with wooden doughnuts for flares. you'll be tuned around 32 hz after sub displacement and bracing. Or an 18" octoport of the sonotube costs a lot. Should still end up with at least 15 cubes after all displacements and bracing.

 

[Mercede]

just do an 18 inch sonotube thats 30(longer if you want lower tuning) inches long with wooden doughnuts for flares. you'll be tuned around 32 hz after sub displacement and bracing. Or an 18" octoport of the sonotube costs a lot. Should still end up with at least 15 cubes after all displacements and bracing.

Alright thank you. I think a slot port would work out the best with the way my wall is tho. I'm not to sure about others ones I have not looked in any others.

 

[Jeffdachef 5,000+ posts]

Alright thank you. I think a slot port would work out the best with the way my wall is tho. I'm not to sure about others ones I have not looked in any others.

really need a picture or something to gauge the distance of how big your port can be.

 

[Mercede]

really need a picture or something to gauge the distance of how big your port can be.

Baffle is 43 inches wide and 33 inches tall.