Question about Aero Ports

[gally]

i i recently built something different than i used to

a aero ported box

Thing is..can i GET THE SAME tuning frequency if I port the Aeroport OUTSIDE the box ?? like an External Aero?

Also..the lenght of the inside the box tuning would be the same as if i do it on the outside?

not asking any in particular just this..as if i do that i can get that extra space or not..just asking

[Jessica]

moving the port outside will increase box volume and change tuning. Cant remember which way though. Maybe up?

edit: of course you can change port length to compensate.

[boometro]

tuning may change a small amount as the port is not taking up airspace anymore. i could be wrong though.

[gally]

ok..im using a port calculator..and if i do an external Aero..in the calculator do i mark as a number of ports at -1 instead of 1(as it would be normal if the aero would ba inside of the box???)

normally

Quantity of ports - 1
Enter Enclosure Volume - 1.9 (ft³ )
Enter Desired Tuning Frequency - 40 Hertz Round Vent
Enter Desired Port Diameter - 4 Inches

Vent Length - 8,21 Inches

outside the box???

Quantity of ports -__ -1__
Enter Enclosure Volume - 1,9 (ft³ )
Enter Desired Tuning Frequency - 40 Hertz Round Vent
Enter Desired Port Diameter - 4 Inches

Vent Length - __-14,21__ Inches

is that correct or am i mistaking something?

[khinds94]

It's still 1 port. Just more volume. You won't notice the difference between the port outside or inside the box. It does increase efficiency slightly though

[Jessica]

Just do pi*r^2 x port length and add that to the box volume in your calculator and see what it does. Leave port at 1 and proper dimensions

[gally]

Just do pi*r^2 x port length and add that to the box volume in your calculator and see what it does. Leave port at 1 and proper dimensions

tried but port lenght gets shorter by 0,6

[Jessica]

just saying figure the volume of the port, add it to the volume of the box (if the box is already built) and then refigure.

but really, one 4" port at 9" is like .06cuft, probably wont make any noticable difference in or out of the box.

[gally]

just saying figure the volume of the port, add it to the volume of the box (if the box is already built) and then refigure.

but really, one 4" port at 9" is like .06cuft, probably wont make any noticable difference in or out of the box.

the volume is aprox 0,08cuft

[Jessica]

just saying figure the volume of the port, add it to the volume of the box (if the box is already built) and then refigure.

but really, one 4" port at 9" is like .06cuft, probably wont make any noticable difference in or out of the box.

the volume is aprox 0,08cuft

that will change tuning like .5hz. that is if the box is already built and you are moving the port from inside to outside. If you havent built it yet you can accommodate. Did you figure sub displacement also?