Bandpass designs

[Robert 2001 10+ year member]

Im looking to do a basic bandpass design or slot port box for 2 rf p1 10s. System will be running around 300 rms off an oldschool bazooka ela 300.1 mono amp. I would like to know what is the sealed to ported ratio on a bandpass box, how to tune to 32 hz,and same for slot port design/ opinions on both, and where to place ports. Box is going in a 2003 chevy tracker. thx

Click to read more...

 

[duanebro 10+ year member]

tuning on a 4th order bandpass box is normally much higher than ported. You need software like WinISD to model it if you want good results.

 

[duanebro 10+ year member]

4BP Fb3 = 38-86hz

closed chamber = 1.3 cf

ported chamber = 1.5 cf

1 6" areo port 11.25" tuning is 57hz

All volume is net, you must make room for the drivers and port in the design.

 

[Robert 2001 10+ year member]

Ok 2/1 ratio now how do I figure port size and tuning

 

[Robert 2001 10+ year member]

Would a ported box work just as well? I wanna hit as low and hard as possible out of these subs. I currently have them sealed but have to build a new box as my wife blew the corner out in her box.

 

[galacticmonkey 5,000+ posts]

I could design and build you a bandpass if you wanted. Im not too far away.

 

[duanebro 10+ year member]

do a 2 to 1 ratio. 1.5 sealed and 3 ported. Tune to 50 or 55 hz. Invert eh subs , that will provide better cooling. Make the port as big as u can fit. That way it wont interfere and u wont have nearly as much port noise

how did you come up with this?

 

[Robert 2001 10+ year member]

Anyone?

 

[duanebro 10+ year member]

You can use WinISD to figure it out. This sub models better in a bandpass box than ported imo. Forget the ratio given in a post above. Modeling is the only way to go with higher order boxes. For this box use 1.3 cubes for the sealed side, and 1.5 net for the ported. A 6" "aero" port works well and is only 11.25" long.

any more info that you need?

 

[Robert 2001 10+ year member]

I was wanting to do 2 ports 1 ea sub. Wanted to keep subs in seperate ported chambers and share the sealed space. Would something like a slot port on the ends of the box work for ports? Are the above dimenions for both subs. Would 2 cvr 10s do better I own a set of those and p1s wlith amps for both hangin out

 

[duanebro 10+ year member]

They might be better I don't know. I don't have time to model it now. Ported boxes are much easier to build. If you want a design for the P1s ported I can draw something over the weekend.

 

[Robert 2001 10+ year member]

Thatll work really wanted to do bp as I dont see many people running them. However im open to a ported as well as it would b an upgrade over a sealed/ blown out prefab. Still cant believe she blew the box out with p1s lol.

 

[duanebro 10+ year member]

if you can, pm me Saturday, just so I don't forget. I can draw up a band pass if you want. But can you build it? LOL I just do 2d drawings btw, but they work.

 

[Robert 2001 10+ year member]

If it can b made I can make it one way or another. I built current box in my sig with a sawzall on the tailgate was told l7s wouldnt fit. This winisd is it available for moble or home computer only.

.

 

[duanebro 10+ year member]

pc only. it will show how a sub will respond to different boxes. It doesn't design the box, just volume, tuning... things like that.