about to port my box

[Arnold55]

my box is 1.5 cubic feet and its saying it need to be 7 inchs long 3 wide to be a 36hz. does that sound about right? and ive seen the pvc port both inside and out the box. what is the difference? thanks guys

[R_Mac_1]

my box is 1.5 cubic feet and its saying it need to be 7 inchs long 3 wide to be a 36hz. does that sound about right? and ive seen the pvc port both inside and out the box. what is the difference? thanks guys

The only difference AFAIK with the port being internal or external is whether it takes up airspace in your box.

Edited January 14, 2010 by R_Mac_1

[crazyfrazz09]

7 inches long and 3 ft wide??????? that doesnt sound right to me.....

shit sorry i read that wrong lol

Edited January 14, 2010 by crazyfrazz09

[R_Mac_1]

7 inches long and 3 ft wide??????? that doesnt sound right to me.....

He said 7 inches long and 3 wide.

21 sq. in. of port for 1.5 cubes sounds decent (falls within the 12-16 sq.in. per cube rule). What sub are you using?

EDIT: after thinking about it, are you saying a slot port that is 7"x3" or are you saying a 3" pvc tube that's 7" long? That would only be ~7 sq.in. of port area

Edited January 14, 2010 by R_Mac_1

[Arnold55]

He said 7 inches long and 3 wide.

21 sq. in. of port for 1.5 cubes sounds decent (falls within the 12-16 sq.in. per cube rule). What sub are you using?

a merlon audio M3 sub i had laying around, its just a little some thing i threw together for now

[Arnold55]

He said 7 inches long and 3 wide.

21 sq. in. of port for 1.5 cubes sounds decent (falls within the 12-16 sq.in. per cube rule). What sub are you using?

EDIT: after thinking about it, are you saying a slot port that is 7"x3" or are you saying a 3" pvc tube that's 7" long? That would only be ~7 sq.in. of port area

pvc port

[Arnold55]

http://www.psp-inc.com/tools.html thats the site im using

[R_Mac_1]

Well, normally the number that gets thrown around is to have 12-16 sq. in. or port per cube for most applications (I think that's what it is).

PVC ports would probably fall into that category. So, if you have 1.5 cubes, you want 18-24 sq. in. of port. Three 3" pvc tubes would put you into that range.

Aero ports are more efficient, so you could use a smaller port area, but I'm not sure what that would be. Maybe 12-18 sq. in. (I'm just throwing a number out, not sure what the actual recommendations are, but you get the idea). In that case maybe one 4" aero port would work for you.

I'd wait and see if a few of the forum gurus can give you more help.

But, you want to first figure out what kind of port you're gonna use and how many, then you need to figure your box volume and port length to calculate tuning.

[Arnold55]

Well, normally the number that gets thrown around is to have 12-16 sq. in. or port per cube for most applications (I think that's what it is).

PVC ports would probably fall into that category. So, if you have 1.5 cubes, you want 18-24 sq. in. of port. Three 3" pvc tubes would put you into that range.

Aero ports are more efficient, so you could use a smaller port area, but I'm not sure what that would be. Maybe 12-18 sq. in. (I'm just throwing a number out, not sure what the actual recommendations are, but you get the idea). In that case maybe one 4" aero port would work for you.

I'd wait and see if a few of the forum gurus can give you more help.

But, you want to first figure out what kind of port you're gonna use and how many, then you need to figure your box volume and port length to calculate tuning.

sweet good thing i didnt go and start cuttin haha. so you think 3 3" pvc tubes would be right? and how long do you think they need to be? sorry im new to all this ha

[R_Mac_1]

sweet good thing i didnt go and start cuttin haha. so you think 3 3" pvc tubes would be right? and how long do you think they need to be? sorry im new to all this ha

Well I'm a bit new too so I don't want to give advice and have it be wrong. Without knowing squat about your actual sub, the 3 3" pvc tubes DOES put you in the usual recommended port area range.

If you're wanting to get a box design, you can ask to have someone do a design for you. May be better to pay $10-$20 to someone who knows their shit in order to save yourself hassle and wood cost down the road.