Perry Babin said:
Can you help me ?
Unfortunately my Alumipro BP12 bandpass , looks to big sitting in my pickup !
My plan is to turn it to a lower longer cabinet that sits nice on the floor (I got a kingcab) the bandpass chamber sizes are .8 & 1 cubic but my problem is the ports , I need to covert the 2x 4.5x13" (heavily flared at all ends) to a slot port but of the 3 charts I found on diyaudio did not help .
Can somebody help me !
bottomfeeder said:
Are you changing the cabinet volume? If not, just keep the (front)surface area of the port and length of the port the same as what it is now.
There are a couple of kinks, however:
- Narrow slots tend to resonate at lower frequencies than a round port with equal (front) surface area because the increased internal surface area presents a larger boundary layer. If you need to use a narrow slot, increase the (front) surface area or reduce port length a bit to compensate.
- You'll have to make a judgement call on what size to consider the existing port since it is heavily flared. A reasonable estimate would be an average of the "throat" and "mouth" areas. Or you can try to locate the port frequencies in the spec's and calculate it from there.
If you are changing the internal volumes significantly, you'll need to start from scratch with port tuning.
tsmith1315 said:
I plan to use the same cabinetS volume , I could use the same exact port sizes but the lower heigth of the cabinet wont allow for a fit of the round ports .
So a slot port is ideal (as long as I can figure out the conversion) .
Maybe I can figure it to a single square port ??
I read (if you convert) the flare ads 1/4 to the length .
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