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Old 08-03-2014, 07:55 PM
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Default how much space for port loading?

Tried to dig up some threads, couldn't find exactly what I was looking for.

I'm in a 96 jeep Cherokee sub up passenger port back driver side.

My question is how much space is ideal for port loading? I'm wondering if my enclosure is being choked. I have about 4", between my hatch and port.

Sundown x-18 2 ohm nominal on a sq2200. Enclosure is ~5.5 net ~77 in of port. Tuned @ 32 but peaking 35-37in cabin.

I'm not sure how to find port length and I can't find a very clear formula.

Is there a rule of thumb for placement to load properly?
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Old 08-03-2014, 08:30 PM
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depends on the port.. {the worst is when the port fires into an area about the same size as the port and essentially it lengthens the port and lowers the tuning}

basically, this is the box you have.. slide it forward and see if there's a difference

the rest can be figured out from there.

the hardest thing for me is reimagining it all after I've alredy put all the design work in..

the easiest way most people find more space is by reducing port to the actual necessary amount...{most ports these days are way bigger than they need to be}
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Old 08-03-2014, 09:02 PM
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I've thought about that myself.. But in my mind too much port is better than too little.

I have my enclosure as far forward as I can get.

I've got my amps mounted to my back seat and a kinetik hc 1800 tucked between my enclosure and amps. Tried to leave an inch or two for some ventilation and to also keep my box off them.

Edit: I had this enclosure designed for me. Haven't had excess budget to design and test a few myself. So remembering exact placement of my port walls is kinda out of the question. Blueprint got lost a long time ago.
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Old 08-03-2014, 09:07 PM
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Atleast 1/2 port diameter
But it can be more depending on how the port is
If it's a big square off to one side you may need a bit more
But usually 1/2 is a good start
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Old 08-03-2014, 09:10 PM
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Did a FI Q 18 in a 94 Jeep cherokee which is the same thing. Was 6 cubes net. It did very well sub up port up, or sub up port back. When we had it sub back port back, we had it pretty close to the hatch. Id say <6" away but dont know exactly how far.

In my jeep with 8 12s subs up port back, it does better the farther I move the box away from the hatch.

I guess Im saying your gonna have to play around with it. lol
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Old 08-03-2014, 09:18 PM
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Well I know experimentation is key. Was more looking for a place to start.

Thanks for the input. Since this is a slot port I'm looking at half length instead of diameter right?

Edit: I'm presuming sonic. But thanks mods for moving this to the right place.

Last edited by southernbass; 08-03-2014 at 09:19 PM. Reason: I see what you did there...
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Old 08-03-2014, 09:55 PM
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Well 1/2 the shorter length of the area
So if it's 11"x7" it would need to be 3.5" off the back wall. But if it's more square than rectangle it may need to be more than that.
If it's like 25x3 (example) it would need to be 1.5" away. But that dimension port would most likely have issues anyway
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Old 08-03-2014, 10:31 PM
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Let me make sure I have my terminology right. I said slot port because I wasn't sure what else to call it. Technically its a traditional j channel port but has an extra turn in it. A w port, I guess? Port is 19.5" tall x 5.5" wide x 20"? Deep. Not sure on depth. Hits the turn and then is another 5.5" w x 10" deep I think?

Assuming any of the above is true, I would take the 5.5" wide, so 2.25" from hatch as a start?

Only reason I'm curious is even now, well broken in, underpowered, clean signal, in tuning, and its still smelly from time to time. Obviously unloading or hitting long high (like 70hz) notes will cause this but from 35-50hz I don't understand why it still stinks.

Was thinking maybe it was seeing a sealed enclosure or if I'm missing something here.

From what I can find the x series is notorious for stinking for whatever reason. Trying to rule the enclosure out.
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