Different Porting methods

[azimuth 5,000+ posts]

this is making no sense to me. 1/2 the port is 1 size and the other 1/2 is another size. the frequencies from the 2 subs won't magically stay on their 1/2 of the port. someone please explain why this works.

 

[92c1v1c 10+ year member]

hey whats the spec of your box i want to make one like it...lol

 

[netzero 10+ year member]

Thats what im saying, how does the middle port work? Would It just be easier to put a separator between the two and make two separate air spaces lol? I was just curious how it works and how to tune for it if it was effective.

 

[GearGuy2001 10+ year member]

this is making no sense to me. 1/2 the port is 1 size and the other 1/2 is another size. the frequencies from the 2 subs won't magically stay on their 1/2 of the port. someone please explain why this works.

You find your Port Length for like a normal L Port box then extend it out so say your port length needs to be 15" to be X Hz

Now lets say your box is 12" Deep (Internally for ease of describing) and Your Main Port is 4"

So

Between the Green Lines is 4", Between the Red Lines is 2", Between the Pink Lines is 10" (Total Depth of 12" minus 2" Red Lines Port=10) and the Distance between the Blue Lines is 5" since you need 15" of port length and you already have 10 (inbetween the pink lines)

 

[netzero 10+ year member]

So, are you tuning each side to a 15" long by 2" wide port? And that will tune both sides to X Hz? I think i got it now, but doesnt that screw with the tuning, how the air shoots together before exiting?

 

[azimuth 5,000+ posts]

So, are you tuning each side to a 15" long by 2" wide port? And that will tune both sides to X Hz? I think i got it now, but doesnt that screw with the tuning, how the air shoots together before exiting?

the port is tuned to a frequency. which is what confuses me. you aren't tuning the air flow. i would think that each sub would see this as a single port, which would make it 2 inches wide on the back leg and 4 inches wide on the front leg of the port. i'm confused as to how you would tune a port like this. are you tuning a 2 inch port or a 4 inch port? this design makes sense to me if we were strictly just moving air. having the front port twice as wide as the 2 rear legs eliminates a bottleneck, which would help air flow, but i'm concerned about the ports frequency tuning, which has nothing to do with the air flow.

 

[netzero 10+ year member]

Ahhh I see. The airflow has nothing to do with the tuning then, just turbulence is all i can see. But now I really wanna kno how to tune it with two different sizes too...

 

[GearGuy2001 10+ year member]

the port is tuned to a frequency. which is what confuses me. you aren't tuning the air flow. i would think that each sub would see this as a single port, which would make it 2 inches wide on the back leg and 4 inches wide on the front leg of the port. i'm confused as to how you would tune a port like this. are you tuning a 2 inch port or a 4 inch port? this design makes sense to me if we were strictly just moving air. having the front port twice as wide as the 2 rear legs eliminates a bottleneck, which would help air flow, but i'm concerned about the ports frequency tuning, which has nothing to do with the air flow.

Look 2 Posts above this original Post I have a nice diagram that explains how to tune it

 

[azimuth 5,000+ posts]

Look 2 Posts above this original Post I have a nice diagram that explains how to tune it

i see that. it still doesn't make sense as to why. where do you find the math or the port calculator to tune it?