Port area arguement

[bgaff45]

I'm in kind of a heated debate with my cousin. (for the record Idk **** about designing enclosures) But I have been reading and this is what I have come up with. I am planning on running a zv512 off of a bc3500 at one ohm( probably gonna throw 2500-3000 watts at it) Listen to mostly rap dubstep and hip hop. Would you guys agree that a zv512 in about 2.5-3 cubes with a 4 inch aero port tuned to 30 hz is way too small of a port area for this woofer. I keep trying to tell him theres no way it will sound good and could even possibly damage the woofer. Am I correct?

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[Papermaker85 5,000+ posts]

Do you want me to rub your back or do you want the real information?

 

[bgaff45]

Do you want me to rub your back or do you want the real information?

lmao a back rub would feel great. But real info would be great

 

[Papermaker85 5,000+ posts]

Car Audio - PORT Size Calculations and Formulas for WOOFER and Subwoofer BOXES

port area is calculated on tuning frequency and displacment. nothing ELSE.

 

[bgaff45]

Car Audio - PORT Size Calculations and Formulas for WOOFER and Subwoofer BOXES

port area is calculated on tuning frequency and displacment. nothing ELSE.

Sorry i left out tuned to 30 hz. According to that calculator 4 inches is way too small

 

[Papermaker85 5,000+ posts]

Sorry i left out tuned to 30 hz. According to that calculator 4 inches is way too small

yea more like 80 inches for a square port and 60 for round..

 

[bgaff45]

yea more like 80 inches for a square port and 60 for round..

and to clarify what will happen if ypu put this or any subwoofer in an enclosure with too small of port? Just alot of port noise or can it cause damage?

 

[wew lad 5,000+ posts]

Car Audio - PORT Size Calculations and Formulas for WOOFER and Subwoofer BOXES

port area is calculated on tuning frequency and displacment. nothing ELSE.

according to your calculator i need a 12 inch diameter port for a 15 lol i dont think so

 

[bgaff45]

according to your calculator i need a 12 inch diameter port for a 15 lol i dont think so

i was kind of skeptical at that considering it says i need an 8 inch port for my 12 when Ive seen people use 8 inch for two. But I still think that each sub needs atleast 2 4 inch ports or one 6 inch port

 

[Papermaker85 5,000+ posts]

according to your calculator i need a 12 inch diameter port for a 15 lol i dont think so

that what you need to keep you noise and resistance low.

 

---------- Post added at 08:01 PM ---------- Previous post was at 08:01 PM ----------

 

btw xmax and actual displacment are different.

 

[wew lad 5,000+ posts]

that what you need to keep you noise and resistance low.

"minimum" means its the minimum its recommending, as in make it bigger than that..

I was going to mention xmax, but i didnt want to get in a pissing match with you over a calculator that doesnt help

 

[Papermaker85 5,000+ posts]

"minimum" means its the minimum its recommending, as in make it bigger than that..
I was going to mention xmax, but i didnt want to get in a pissing match with you over a calculator that doesnt help

plot the driver look at the displacement graphs and build accordling.

i have 72" slot port and could use more. i have about 260 or so after rise above FS so my driver MOVES. as in your case with the single 18 Id do at least 120.

 

[Papermaker85 5,000+ posts]

according to your calculator i need a 12 inch diameter port for a 15 lol i dont think so

FYI. you do realize that having more port area means MORE displacement and MORE output correct? its kinda like say i have a 15 with a 12" passive radiator.

 

[wew lad 5,000+ posts]

FYI. you do realize that having more port area means MORE displacement and MORE output correct? its kinda like say i have a 15 with a 12" passive radiator.

how does any of this actually help, your calculator is still useless for the most part

 

[BOOMINGRANDPA 5,000+ posts]

Sorry i left out tuned to 30 hz. According to that calculator 4 inches is way too small

6" would be min i'd try on a 12" in any box 2cf or bigger., but i also think power u running has a lot to d with it to so if u running a 400rms amp to a small sub 4" probably ok if u running 1200-2500rms to big *** sub u need much more port.. wins program shows port air velocity., just for fun i used my fu 750 in 2.6 cfad box with 2krms (about what u would have if u run around 3k to it) and even a 5.5" port would not be good, u would need a 8" port that would give u 73fps port air..