new build going on this week, in final stages of planning. need help though

[tank65 10+ year member]

Well since my first build for the l7s screwed me over by an inch after 2 remodels on the same box im starting over. i am doing 2 seperate boxes for my 15in l7's.

After sub displacement it is 4.41 cubic ft. each. now i want to tune to anywhere between 30-34 most likely 30 because i want to be heard coming from a long ways heh. But can someone help me figure out a port design? either slot or tube.

thats the design of the box. i was hoping to have the port towards the back so it shoots up vertically into where i removed my 6x9's.

internally its 16.25in. in height

16.50in. in width

29.50in. depth

any help would be appriciated i know theres calculators out there but id rather get some expert help off here if im doing anything wrong lol

Click to read more...

 

[ultimate157 5,000+ posts]

After sub displacement it is 4.41 cubic ft. each. now i want to tune to anywhere between 30-34 most likely 30 because i want to be heard coming from a long ways heh. But can someone help me figure out a port design? either slot or tube.

Prepare to be flamed, and your shit stolen

 

[tank65 10+ year member]

well im looking for whatever sounds better inside the car. so would going around 34hz do it for me?

 

[Chevyaudio 5,000+ posts]

30hz is fine man...but I would tune a tad higher...maybe 33-34. Just because music doesnt often dip below 33hz. and you will gain a little output with a higher tuning frequency.

 

[tank65 10+ year member]

alright thnx, now my only problem is how to do the port. if i dont have enough room to face the port vertically can i just port it on the back of the box towards the back seat?

 

[tank65 10+ year member]

so thats what ive come up with tuned to 33hz. good or no?

 

[tank65 10+ year member]

ok so i went with tube ports this time on the finaly sketchup. three , 3in. ports at 9in. long each for 34hz. ill be building both boxes on the weekend

 

[mazdakid 5,000+ posts]

you need more port area for a 15L7, 3" is tiny

 

[tank65 10+ year member]

k so what about two 5in ports?

 

[tank65 10+ year member]

bump, need to know by tomorrow so i can pick everything up at once. two 5in. ports on each box at 17.1in long for 34hz