Where do you purchase your sub ports

This may seem like a lame question but i have been searching this site as well as doing a little googling and havent found a thing.

Im an installer that has been in custom retirement (still did little stuff) since i started up my engine building phase and now have fallen back to audio after about 5 years. Its time to start the build in my IS300 and im stocking my materials up and cant figure where to get my port material from. I have already gotten my PVC from the normal home depot but are lacking the "Front" or port entrance that i will glue my PVC to. Can somebody please guide me on this? I feel like a friggin green bean here! lol

Online locations are fine with me as i can wait the ship time om not that impatient. Thank you in advance!

Oh and doodie while im at it... where do alot of you pick up your supplies period? The typical heat shrink, connectors, terminals, carpets, that kind of thing? I have used InstallationProducts.Com in the past but im sure others have good locations as well. Again thank you.

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whats this wire do ??? poof.. ohhhhh!

You can get tube ports pretty cheap on www.partsexpress.com. Personally I prefer a good slot port anyday. I also get my connecters and foam baffles from there too.

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"People with mullets live 40% longer"   - Ricky Bobby

I usually slot port also. When I do need a round port though I just use pvc and flush mount it with gorilla glue between the wood and pvc so it gets sealed in the mdf hole perfectly. I also round off the inner edges of the pvc so it doesn't make any port noise.

I am on the slot port train for street use, but we build using precission ports from parts express for our SPL vehicles.    The Civic coupe uses a slot port for SPL, but the CRX's all use round ports

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2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR
2007 USACI World Champion
2007 World Record
2006 USACI Finals 2nd Place

Quick question, what is the real world difference between a slot port and round port...other then the obvious one is round and the other is a slot :)

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1968 VW Beetle
Pioneed DEH-780MP, 2 10' Memphis PR104D, Memphis PR500.1, TXC 6.1, MTX Thunder 8502

I think slot ports are easier to build with rectangle boxes. If the port needs to be longer than the box, you just make a 90 degree turn and continue along the path. With pvc, you have to use an elbow and its just more difficult to me. Thats just my preference. Im sure there is a better reason out there.

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"People with mullets live 40% longer"   - Ricky Bobby

Slot ports offer a lot less chance of port noise.

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double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer

There are companies that make Aeroports. Aeroports consist of rounded end bells and a specific width of pipe for it. They can be purchased as a kit. Using thick wall pipe is another option provided that you can get it to secure good and tight to the enclosure. Where the pipe is going to come through a wall for example, I would double or even triple the thickness of the mdf there so that there is more surface area of the port to sit and hold against. You can either silicicone or glue the port into place. I would tak a 1/2 " roundover bit and round the inner side of the port on the inside the box end. On the outside of the box, it should be easy to sand it down fluch with the surface of the box and then take a 3/4" roundover bit to it, this will cut into the mdf by about 1/8" and into the pipe a good length but it yields a perfectly rounded port  on the outside of the box.

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Top Secret, I can tell you but then my wife will kill me.

luckydevil wrote:

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I usually slot port also. When I do need a round port though I just use pvc and flush mount it with gorilla glue between the wood and pvc so it gets sealed in the mdf hole perfectly. I also round off the inner edges of the pvc so it doesn't make any port noise.

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This is exactly what i have been doing in the past and then going back and sanding to have my rolled edge into the box as well as the PVC on the inside end to eliminate noise. This is all great info and its appreciated but lets dump further into the slot port situation if you dont mind. Currently i have my IS3 setup with a temperary enclosure thats running a slot port design. In the past though i have only calculated port length and tuning through ROUND port... and have yet to find a good way to calculate my slot ports. Can anybody elaborate on that side of it? The current setup i did on my car is calculated with the length of the longest side which im sure i did wrong but i kew it was going to be a temp setup. Thanks for all the good information by the way.

Check out BassBox Pro software. It will calculate any shape of port. Its the best software Ive found as an all around subwoofer enclosure design program

Calculating a slot port from a round port is basic math. The length of the port does not change. The area of the port does not change. So the formula for area of a circle is pi * r^2. Convert this figure to l * w = pi *r^2 and you now have the start of your slot port.

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Top Secret, I can tell you but then my wife will kill me.

<---- Mathematically challenged :)Think I will stick to round ports lol

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1968 VW Beetle
Pioneed DEH-780MP, 2 10' Memphis PR104D, Memphis PR500.1, TXC 6.1, MTX Thunder 8502

forbidden wrote:

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Calculating a slot port from a round port is basic math. The length of the port does not change. The area of the port does not change. So the formula for area of a circle is pi * r^2. Convert this figure to l * w = pi *r^2 and you now have the start of your slot port.

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So basically you're saying: converting a 9" x 4"dia round port would give you about a 1"x12"x9" (or 3"x4"x9", etc.) slot port? So long as the length matches correctly for the sound wave to form properly for the box size. Looks like I've been making a mountain out of a molehill trying to figure this out before.

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The Flakman
I feel strange. I have deja vu and amnesia at the same time.

John | Manteca, CA

Here is the math behind your 4" round port. Here is the forumula again, 3.14 x r^2 or 3.14 x 2^2 ( the diameter is 4", meaning the radius is half the diameter). Now you have a figure to work with of 12.56". You cannot really have too much port face (per say) but too little is a problem and same with too narrow. Going under 2" for example is going to make some noise, thus the 1" x 12" is not that crap hot of an idea. The 3" X4" is fine, 2" x 6" and so on. Any two numbers that when multiplied = yout known area.

When faced with say 60 sq" of port face, this is going to equate to a crapload of round ports, this is where the slot port really shows it's design. It is very easy to construct a single port on these dimensions. (well sometimes, the box I am working on right now needs 90 sq" of port face and space is at a premium right now). It is far easier and takes less space to make a single slot port than it does to try and squeeze multiple round ports to do the same job (unless the cool factor is what you are after).

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Top Secret, I can tell you but then my wife will kill me.