4th order BP, how to figure out what its tuned to?

[socialstealth 0]

I had a 4th order bandpass box designed for me, but he didn't give me an output graph or tuning frequency or anything else.

So before I build the box, I'd like to know what the output graph looks like (if there are any high/low peaks/dips in the curve at certain frequencies).

How can I figure out what the 'range' of the box/sub is? I'm not sure how to ask this, but I'd like to know the frequency band width. Whats the lowest the sub should play and the highest the sub should play. So I know where to set my subsonic//lowpass filters.

Can anyone help me? Let me know what measurements you might need or just tell me how I can calculate it.

[///M5 2,833]

Do you know the exact size of the box chambers? If not, you can't. If so, WinISD will give you an idea, but you have to do some measurements if you want to take your car into account.

Do NOT expect that it will work "right" the first time through. Building a few of them will be required to get dialed in no matter what your goal. It would really help to have you state a goal...in particular since I really doubt that a 4th order BP is as logical solution for you. Most likely there are much better alignments for your needs.

[socialstealth 0]

Ah well I'd like the box ported into the cabin, with the trunk sealed off. And I'd like a lot of low end dbs, anywhere from 15hz-40hz, the lower the better.

I have a google sketch of the box drawn to scale, so it has all the measurements.

Edited August 27, 2010 by socialstealth

[jblcamry 103]

1.14 sealed

3.33 ported

40 sq inches of port. tuned to 44.

i built one very with very similar specs and it does very well on the lower end. does not plot well in win. but in car is another story.

[socialstealth 0]

1.14 sealed

3.33 ported

40 sq inches of port. tuned to 44.

i built one very with very similar specs and it does very well on the lower end. does not plot well in win. but in car is another story.

not sure i follow why you posted that? I think you have this thread mistaken with the 4th order caviler thread.

Edited August 27, 2010 by socialstealth

[jblcamry 103]

Pretty sure the box your talking about is the one i designed for argent? If I'm mistaken, sorry for the post dump.

[socialstealth 0]

Yes I think your right; I bought the design from argent, and those are the specs.

when you say 'low end', how low are you speaking of?

I'm not familiar with 4th orders, and the 'high' tuning scares me.

Any idea where I should set the subsonic filter/high pass to protect my driver? (12'' dc lvl 4)

[jblcamry 103]

Yes I think your right; I bought the design from argent, and those are the specs.

when you say 'low end', how low are you speaking of?

I'm not familiar with 4th orders, and the 'high' tuning scares me.

Any idea where I should set the subsonic filter/high pass to protect my driver? (12'' dc lvl 4)

44 is quite low.

the one in the vid will play good down to 25hz and its tuned to 55iirc

i would set it to around 20hz

[socialstealth 0]

Thanks!

[///M5 2,833]

Ah well I'd like the box ported into the cabin, with the trunk sealed off. And I'd like a lot of low end dbs, anywhere from 15hz-40hz, the lower the better.

I have a google sketch of the box drawn to scale, so it has all the measurements.

Build a 6th order then.