Building a box, Slot vs Aero?

[adjetta 10+ year member]

ok so I have this 15 inch hcca, in a pre-fab 4 cube vented enclosure, its weak sauce.

I had 2 15 inch l7's in 7.6 cubes with an 8inch aero tuned @ 29 hz, it was straight nasty.

So I need to bring the nastiness back with this box I'm getting prepared to build.

Now what I need from you is input, and guidance. I'm either doing a slot or an aero, but am leaning towards slot due to flares larger than 6 inches being hard to come by. What would give me better lows/pressure, I'm working with a trunk with fold down seats.

Another question I have is what are some different options for slot porting, I really am coming up with blanks, and google has been unfruitful.

Click to read more...

 

[Moble Enclosurs 10+ year member]

hey man! As far as slot vs aero, the differences in the actual output depend too much on the physical form of the design to give a direct answer to what may work best. And calculators and programs do not account for those types of changes. The main differences between a slot and an aero port are the limitations that exist with each and the type of output you are looking for. The slot port will give you MUCH more options with less hassle when you compare the gains/losses you get from it vs an aero. But the aeroport can keep the pressure up much easier than a slot port if the ratio of the slot port is further away from a square or a 1:1 H*W ratio. So, if you were to use a slot, keep the design low profile and make the slot as square as possible and utilize as much floor space as possible to gain volume if needed.

As far as layouts, this is also design dependent as changing small things in certain designs can make or break the output so it really needs to be carefully calculated to get the most out of it.

Now regarding pressure, this is something I have written a small blog about linked on my FB page about how to accomplish hair tricks and what not, but the most important thing to gather out of that is the differences between an audible output or environmental pressure and the balance between the two will usually result in the best output for most listeners regardless of tuning factors.

Hope that helps //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 

[adjetta 10+ year member]

thanks for the good info, I'm wanting a pretty low tuning, so a large square port would work about as good as an aero for keeping up cabin pressure?

 

[dbeez 5,000+ posts]

i have some 8' aeros i may sell

 

[dbeez 5,000+ posts]

i have some 8' aeros i may sell

 

[CAT MAN 5,000+ posts]

i have some 8' aeros i may sell

ill take them. aeros are better in trunk walls IMO.

 

[CAT MAN 5,000+ posts]

i have some 8' aeros i may sell

ill take them. aeros are better in trunk walls IMO.

 

[des343 10+ year member]

hey man! As far as slot vs aero, the differences in the actual output depend too much on the physical form of the design to give a direct answer to what may work best. And calculators and programs do not account for those types of changes. The main differences between a slot and an aero port are the limitations that exist with each and the type of output you are looking for. The slot port will give you MUCH more options with less hassle when you compare the gains/losses you get from it vs an aero. But the aeroport can keep the pressure up much easier than a slot port if the ratio of the slot port is further away from a square or a 1:1 H*W ratio. So, if you were to use a slot, keep the design low profile and make the slot as square as possible and utilize as much floor space as possible to gain volume if needed.
As far as layouts, this is also design dependent as changing small things in certain designs can make or break the output so it really needs to be carefully calculated to get the most out of it.

Now regarding pressure, this is something I have written a small blog about linked on my FB page about how to accomplish hair tricks and what not, but the most important thing to gather out of that is the differences between an audible output or environmental pressure and the balance between the two will usually result in the best output for most listeners regardless of tuning factors.

Hope that helps //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

I wish i could take what you just said and use it im certainly not a slow or stupid person but man something about the whole box and tuning and PORTS and box rise for ohm load and all that is so hard for me to grasp and make sense of ive read a ton and wind up with more questions than answers :/

 

[des343 10+ year member]

hey man! As far as slot vs aero, the differences in the actual output depend too much on the physical form of the design to give a direct answer to what may work best. And calculators and programs do not account for those types of changes. The main differences between a slot and an aero port are the limitations that exist with each and the type of output you are looking for. The slot port will give you MUCH more options with less hassle when you compare the gains/losses you get from it vs an aero. But the aeroport can keep the pressure up much easier than a slot port if the ratio of the slot port is further away from a square or a 1:1 H*W ratio. So, if you were to use a slot, keep the design low profile and make the slot as square as possible and utilize as much floor space as possible to gain volume if needed.
As far as layouts, this is also design dependent as changing small things in certain designs can make or break the output so it really needs to be carefully calculated to get the most out of it.

Now regarding pressure, this is something I have written a small blog about linked on my FB page about how to accomplish hair tricks and what not, but the most important thing to gather out of that is the differences between an audible output or environmental pressure and the balance between the two will usually result in the best output for most listeners regardless of tuning factors.

Hope that helps //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

I wish i could take what you just said and use it im certainly not a slow or stupid person but man something about the whole box and tuning and PORTS and box rise for ohm load and all that is so hard for me to grasp and make sense of ive read a ton and wind up with more questions than answers :/

 

[adjetta 10+ year member]

PM'ed Dbeez

 

[wenn_du_weinst 10+ year member]

I really don't see much advantage to round ports over square if both are straight runs. I think most of aero gains are because the ports don't usually have corners.

 

[wenn_du_weinst 10+ year member]

I really don't see much advantage to round ports over square if both are straight runs. I think most of aero gains are because the ports don't usually have corners.

 

[dbeez 5,000+ posts]

ill take them. aeros are better in trunk walls IMO.

i have a mold to make flares and couplers will start making them sometime when i can free up some time to stock up some.

 

[dbeez 5,000+ posts]

ill take them. aeros are better in trunk walls IMO.

i have a mold to make flares and couplers will start making them sometime when i can free up some time to stock up some.

 

[Moble Enclosurs 10+ year member]

I really don't see much advantage to round ports over square if both are straight runs. I think most of aero gains are because the ports don't usually have corners.

Yea, this is true, and for that specific reason also. Much like the compression in any opening whether port or window, or sunroof, door, etc, the higher pressure resides around the edges and the corners, so by using an aero, you get a smoother flow at some frequencies around tuning and if the phase is good, you get some **** decent pressure from the aeros. Which is why I also agree with the trunk wall quote as well. These can do some damage when used with bandpass designs too.