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post #1 of 3 Old 03-25-2020, 12:16 PM - Thread Starter
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Slot port design questions

Working on a big sub design, have some questions about slot porting it. The slot is going to run down the long edge and open on one end, no bends or turns.

1) How much clearance does the inside of the slot port need from the wall? If the inside of the sub is 44" and the slot is 40" (so 4" clearance between the mount and the wall), is that okay?
2) I have the slot divided so it's two adjacent slots of 2" x 7.5". Is that reasonable?
3) Should I round or flare the inside entrance of the slot?
4) Any advantage to folding the slot instead of running it super long?
5) Does painting inside the length of the port make any functional difference?
6) My port will be firing towards the ceiling, so I'd like to put a grill over it to prevent things falling in. Is metal speaker grill mesh appropriate?

Last edited by Promit; 03-25-2020 at 12:21 PM.
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post #2 of 3 Old 03-25-2020, 02:39 PM
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1) Yes but the port tuning will likely come in a little lower than you planned, the box wall tends to behave a little like a port for a bit beyond the end of the actual port.

2) Fine.

3) Both internal and external, yes. Remember ports flow both directions.

4) No real advantages, somewhat reduced standing waves, reduced port efficiency. If you can make it straight, do so.

5) No.

6). That's most likely fine.
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post #3 of 3 Old 03-26-2020, 04:20 PM
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Ditto Chris except;

4: At high flow rates folds in ports can cause turbulent flow and port compression. Keep them straight if possible. Also, why not use round tubes as they have less turbulent flow as they have a better volume to surface area ratio?
6: The mesh should be as open as possible.

It also helps to post your design as the brains trust here will likely see errors in the design that you may have missed or not considered.
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