Tube or Slot Port?

[Psyence 10+ year member]

Is there any sound difference if you use a slot port over a regular tube port? If they are tuned to the same frequency?

The reason I ask is im going to make a new enclosure, its got to be ported, I prefer slot ports, but not too sure about doing that in a very odd shapped box...

Danka!

Click to read more...

 

[JimJ 5,000+ posts]

No sonic difference.

Sometimes, because of port noise, one could be more suited to a specific cabinet design, but acoustically, they should function the same. If they don't, something's built wrong //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[Psyence 10+ year member]

So what about slot ports... If I build a hollow rectangle basically to the size and dimentions of the tuning I would like that coincides with the boxes internal volume, can I basically fiberglass it in there somewhere on the box... ? Does its orientation have a huge effect on the quality?

Obviously im not putting it directly behind the sub or anything...

 

[JimJ 5,000+ posts]

The orientation could affect the overall output, but that's extremely install dependent. Couldn't say anything about that unless we saw detailed photos of the surrounding cabin...

 

[Psyence 10+ year member]

Yeah, its will be a really odd shape...

What I did was took out the 1/3 of my rear seat, and the box will be there so that I can still have 4 people sitting in there comfortably... Just the square box I have in there now takes up WAY too much space, because of the angles adn step downs in the body of the vehicle...

I guess I can just build the box, then worry about the port afterwards...

Im actually thinking about scrapping the ported design, just for size's sake...

But im not sure weather 2 Type-Rs sealed will be as loud as 1 ported... anyone know for a fact?

 

[geezy21unc 10+ year member]

1 ported type R in the right tuned up box , will murder 2 sealed R'z, (FACT)!

 

[brad 10+ year member]

ported will give more output.

slot ports are easier to make, but if you do round ports use aeroports.

 

[Psyence 10+ year member]

I've never used Aeroports before, but I do see them for sale everywhere, just wondering tho, are they adjustable for length? Cause it looks like they are just in a few different standard lengths?

 

[DFW40 10+ year member]

Aeroports are great but if you need to make one over 20 inches and you need a 90 degree bend you cannot use one. I use regular PVC with the 90 degree elbows and it works fine, take a router and flare out the edges especially one the outside of the box.

 

[audioholic 5,000+ posts]

No sonic difference is a bold statement Jack. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif It has me thinking. Yes I know all the differences between round and slot ports (air speed characteristics of the two and how that can affect sound). Two different boxes, same tuning, same port area, id take the round port enclosure myself. More of a constant air flow through out the port cross-section, less chance for turbulence, etc. But in the real world most slot ported boxes have considerably more port area than their PVC round port counterparts, and well, lots more port area makes up the for air flow drawbacks of the square port design (most of the air ends up flowing through the center of the port, leaving the corners with relatively low air speed). So in the end you can basically say they are a wash which you chose, but I would not necessarily say they have no sonic differences between the two design types. Maybe Im just being nitpicky here (sorry lol), just making sure someone doesn't read this and not realize there are in fact some differences between the two types that should be considered.

Im a slot-port guy myself, but like I said before, all other things being equal (tuning, port area, bracing, etc), Id chose a round port setup over a square one. But, Id chose a bigger port area square-port over a smaller area round-port setup any day of the week (a more realistic comparison).

 

[JimJ 5,000+ posts]

No sonic difference is a bold statement Jack. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif It has me thinking. Yes I know all the differences between round and slot ports (air speed characteristics of the two and how that can affect sound). Two different boxes, same tuning, same port area, id take the round port enclosure myself. More of a constant air flow through out the port cross-section, less chance for turbulence, etc. But in the real world most slot ported boxes have considerably more port area than their PVC round port counterparts, and well, lots more port area makes up the for air flow drawbacks of the square port design (most of the air ends up flowing through the center of the port, leaving the corners with relatively low air speed). So in the end you can basically say they are a wash which you chose, but I would not necessarily say they have no sonic differences between the two design types. Maybe Im just being nitpicky here (sorry lol), just making sure someone doesn't read this and not realize there are in fact some differences between the two types that should be considered.
Im a slot-port guy myself, but like I said before, all other things being equal (tuning, port area, bracing, etc), Id chose a round port setup over a square one. But, Id chose a bigger port area square-port over a smaller area round-port setup any day of the week (a more realistic comparison).

If the slot port is built to a proper ratio, and the round port is sized correctly so as to avoid port noise, would you be able to tell the difference between the two in an ABX test? That's what I was getting at...I doubt you could.

Would be a neat ABX test to do, though.

 

[ruckus]

I used slotted ports and Precision ports and prefer the precision ports myself. to me my precision ports seem louder than my slotted port boxes. Of course it could just be my round port box is better designed.

 

[audioholic 5,000+ posts]

If the slot port is built to a proper ratio, and the round port is sized correctly so as to avoid port noise, would you be able to tell the difference between the two in an ABX test? That's what I was getting at...I doubt you could.
Would be a neat ABX test to do, though.

You wouldn't be able to tell the difference, I agree. Theoretically you could design two different boxes, one slot and one round port, that exhibit the exact same air flow characterisitcs (in terms of volume of air moved), but then they wouldn't have the same port area. Or you could design two different boxes, one slot and one round, with the same port area, and they wont exhibit the same air flow characterisitcs (therefore different sound 'anomolies'). That was my point. Its a consideration when deciding which port type to use for a new box design.

 

[Spr0ket 10+ year member]

Great information audioholic and jack.

//content.invisioncic.com/y282845/emoticons/thumbsup.gif.3287b36ca96645a13a43aff531f37f02.gif

 

[JimJ 5,000+ posts]

What information did I give? I just spouted some non-technical logical ramblings //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif