Aero vs. Slot port....not sure which to go with help me decide, this will be fun, just look!!


Mikey T

CarAudio.com Enthusiast
Apr 6, 2019
29
1
I've only ever built or bought a box with an Aero port.  Since I've been looking at installing a new system I thought might try something new and go with a slotted port.  I'm not sure what the advantages or disadvantages of using the slot port are.  I've only "heard" they are a more "boomy" in their exhaust of air hence creating more spl?  I know I'm probably wrong, but that's okay, that's why I am asking this question.  Not sure of the benefit or if there is one, I'm sure there has to be or why not just keep using traditional aero ports, right?  I do understand turbulence, port noise, friction, so those things we'll say aren't factored in-maybe they're not, I don't know.  I'm not talking about a 4th or 6th order box, just a normal box with a slot port in it.  I'm sure there is some debate about this and I'd like to see what's out there about this topic.  This is all to help me build/buy a new box.  Not sure what variables all go into the decision between the two or if the actual speaker is part of that.  Let's say if need be for example sake without manufacturer preference, you have a quality 12" subwoofer that isn't really biased between spl or sq, a $250 dollar offering, you have the space for the box and it will be rear firing in a suv, that's all the information you get on this one.  Have fun with it, I'm looking forward to seeing this debate/discussion.

 

dudeogo

Actually a Potato
Sep 20, 2016
583
10
Springfield, Mo
The more equal the distance is from the center of the port to any side the more efficient the port will be. That being said, the aeroport is the more efficient kind of vent you can use. They cause the least amount of air resistance in the vent. You can get away with a smaller vent for the same performance or the same size vent with even more performance if the sub's suspension can handle it. 

 

dudeogo

Actually a Potato
Sep 20, 2016
583
10
Springfield, Mo
as long as the subwoofer is suited for a ported enclosure you can use an aeroport. it is just another way to vent air. I have 2 10" aeros in my box for my 2 18s because I would like the box to be as efficient as possible with it's vent area.

 
OP
M

Mikey T

CarAudio.com Enthusiast
Apr 6, 2019
29
1
If the speaker sits in the center for asthetics the port will be off to the left or the right of it. So as you look at it you'll see the speak and the hole for the port, does that help?

 

fithwheel

Member
Dec 8, 2017
873
185
indiana
I'm not really sure what the real question is here because of your other thread. Is this about a ground shaker box? If you can build your own enclosure why are you considering a pre fab? 

 
OP
M

Mikey T

CarAudio.com Enthusiast
Apr 6, 2019
29
1
Lol ....for women. The Groundshaker thing was just something I saw while looking at stuff, I'll most likely build one. O was just reading see articles about porting and was wondering about differences and if people have seen better results going one way or the other. I was just throwing a few things out there for discussion purposes to see what feedback was out here and to have fun seeing what people's opinions, experiences, and ideas are.

 
OP
M

Mikey T

CarAudio.com Enthusiast
Apr 6, 2019
29
1
Sorry about the bad typing, all thumbs on the phone you know. I love that box ... she's purty

 
OP
M

Mikey T

CarAudio.com Enthusiast
Apr 6, 2019
29
1
Yeah, the groundshaker thing was just something I saw, that's all. 

 

fithwheel

Member
Dec 8, 2017
873
185
indiana
Definitely an advantage if you can build your own. As far as slot vs ported I think it comes down to personal preference. Sometimes it just makes more since to use a slot to get the desired port area ie small box. I do like working with round ports and do believe they're more efficient if done right of course. Good luck with your build..

Yeah, the groundshaker thing was just something I saw, that's all. 
 
OP
M

Mikey T

CarAudio.com Enthusiast
Apr 6, 2019
29
1
For sure more efficient. That's what I'll go with, plus you can have fun with design and paint it for accent or whatever.

 

Lojze Carman

CarAudio.com Enthusiast
Mar 19, 2019
39
2
Round ports are more efficient compared to square or slot port with the asme port area, they are easier to retune if needed too. On the pics, those are mine production  - SQ 125 mm (5"), also have 8" for SPL comps

LBaudio aero 125.jpg

IMG_0439 125 aerro komplet f:r.jpg IMG_0356.jpg IMG_0351.jpg IMG_0333.jpg

 
Last edited by a moderator:
OP
M

Mikey T

CarAudio.com Enthusiast
Apr 6, 2019
29
1
Those are sweet looking!!! I guess you make them in different sizes and colors? What does SQ 125mm mean? Depending on my box I may use a 3 or 4 inch.

 

Lojze Carman

CarAudio.com Enthusiast
Mar 19, 2019
39
2
SQ 125 mm - this is 5" aeroport ending, 2 pcs in set, everything fits on standard PVC tube - inner mouth dia is 118 mm, outer dia is 125mm, flange is approx 10 inches+ diameter. It also exist in DUAL version.... this aero port is made for SQ systems with subs from 10"-12", for 15 it would be on the small side, but still pass

200 mm is standard 8" aeroport, I belive this was the FIRST 8" aero in the world - product is approx 15+ years old. I set a couple ow world records in dB Drdag in 2004/2005.... - this one performs better than any other 8" aero that we tested side by side

All my products are hand made, wall thickness is between 0,5-0,8 inch thick fiberglass..... no cheapo ABS plactic here folks!

 
Last edited by a moderator:

nate0

Junior Member
Apr 18, 2018
175
21
Phoenix, AZ
SQ 125 mm - this is 5" aeroport ending, 2 pcs in set, everything fits on standard PVC tube - inner mouth dia is 118 mm, outer dia is 125mm, flange is approx 10 inches+ diameter. It also exist in DUAL version.... this aero port is made for SQ systems with subs from 10"-12", for 15 it would be on the small side, but still pass

200 mm is standard 8" aeroport, I belive this was the FIRST 8" aero in the world - product is approx 15+ years old. I set a couple ow world records in dB Drdag in 2004/2005.... - this one performs better than any other 8" aero that we tested side by side

All my products are hand made, wall thickness is between 0,5-0,8 inch thick fiberglass..... no cheapo ABS plactic here folks!
PVC and a heat gun was my method, because I was cheapo, because I just wanted to test for my own ear  :) .  I have no preference yet, but I am assuming there is trade off for ABS/PVC wall thickness from what you have, also the finish, and flare size/shape?  Ever done an oval port?  Just curious and you seem like maybe more of an expert on aero ports when it comes to SPL, so I wanted to hear what you have to say.  I am guessing once you get upwards of 160 db + then those little differences come into play more so than others.

 
Last edited by a moderator:

Lojze Carman

CarAudio.com Enthusiast
Mar 19, 2019
39
2
Nate, no I havent done any oval aeroport ending, A competitor colege from Austria used big oval port for his Band-pass box for street B -2005 team painer - austria.
Flair shape has a lot of an impact on how Aero will perform....point is to stear laminate air flow away from port mouth and the result of that is less port compression.
I have used my 8" aeros only in small classes like Street A and Street B from that era (2004/2005), and results we made were in 156-157dB area....but this was 15 years ago🤔

as you can see from the pictures I also done some minor modifications to the rear flair - difference was approx 0,1-0,2dB. Elevate port from box also had an impact on result - worth of testing. ALso smooth transition from port flare and PVC pipe is important so Nothing interfere with airflow. Make inside of the box as smooth as you can - polyester resine or paint. 

My friends that are holders of numerous WRs in dBDrag all uses Big Slot-ports in their competition systems.... I would say go with round aeros in Street classes, SS and higherclasses - big slot

 
OP
M

Mikey T

CarAudio.com Enthusiast
Apr 6, 2019
29
1
So you ends will fit in a standard PVC tube then, right? Then why the different diameters? I guess the inner fits on the inside of the tube and the outer fits on the outside? What makes them for SQ, sorry but I don't understand. Will a 5" port be okay for only a 12" subwoofer? I guess it doesn't matter as long as the box is built correctly and you have the right port length to achieve the tuning frequency you desire I'm assuming. Recalibrate my brain if I'm going in the wrong direction please.

 

Lojze Carman

CarAudio.com Enthusiast
Mar 19, 2019
39
2
5" aeroport is spot on for one 12" subwoofer.
Two different diameters were listed because one in inner pipe diameter and the other is outer pipe diameter - the difference is PVC pipe thickness.... Important is inner port diameter - the effective crossection.
And yes - standard 5" pvc pipe fits exactly to outer PVC pipe diameter, so you can change PVC pipe lenghts as much as you need and the cost is minimal.

Important is the air speed trough the port and it should not be more than 20-30 m/sec - if air speed is higher, port noise will probably accure. With bigger pipe cross section the air speed will be lower, but port lenght will need to be longer.

You need to shorten your PVC pipe for a half of height of each aeroport ending used (if the complete aero ending is 5 cm high and you use one on each side of the port you will need to shorten your pipe for approx 5 cm to obtain calculated tunning, otherwise you will end up with lower than predicted tuning and with lower acoustic power.

 

Create an account or login to comment

You must be a member in order to leave a comment

Create account

Create an account on our community. It's easy!

Log in

Already have an account? Log in here.


Users Who Are Viewing This Thread (Users: 0, Guests: 1)



Trending topics

Latest classifieds