So i've got a boombox enclosure with 10 litres. Drivers are dual 4" Faital Pro 4FE32 full spectrum. With the online calculator I used a 30mm inside diameter single pvc hose with 8cm length. The sound is totally miserable.
I removed the port and filled the hole with the before cut piece and sanded it.
Now i got myself a 36mm inside diam. port. I'll use dual ports on each half sides of the back panel. Since I can't trust online calculators no more I'm leaning towards your help guys. What length should i use? Tuning should be around 81Hz.
Thanks
I removed the port and filled the hole with the before cut piece and sanded it.
Now i got myself a 36mm inside diam. port. I'll use dual ports on each half sides of the back panel. Since I can't trust online calculators no more I'm leaning towards your help guys. What length should i use? Tuning should be around 81Hz.
Thanks
Which online calculator did you use?
Download WinISD, and if your speaker is not there, load it into the program, then run your calculations on a new project.
LinearTeam
If i understood correctly - you will be using 2 pieces of 4fe32 in 10 liter volume and you are planning to use 2 BR pipes per cabinet with inner diameter of 3.6 cm ?
If that's so, the length of pipes should be 7.5cm each for tuning at 81Hz. It looks like this:
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New webpage for the much more accurate, feature laden V0.7x program: WinISD - Linearteam
http://www.linearteam.org/download/winisd-07x.exe
facebook: https://www.facebook.com/WinISD/
GM
+1, ~80 Hz using high Qt PA, mobile audio drivers is what I wound up with back in the '70s, '80s when I was building them for the kids/teens. Nice [mid] bass 'bloom' works well outdoors, yet still tolerable at low volume in a bedroom.
GM
I used these two online calculators.
LinearTeam
Port Length Calculator
I use macintosh but have access to windows pc occasionally. These calculations are very unfamiliar to me, so many parameters I don't know how to properly use therefore I'm a bit sceptical using the simulating software.
Longer port means lower tuning? I'm limited with enclosures depth with around 11cm for the ports length. So leaving a few centimetres after the inside port opening might be advisable?
Thanks everyone for your replies, N
LinearTeam
Port Length Calculator
I use macintosh but have access to windows pc occasionally. These calculations are very unfamiliar to me, so many parameters I don't know how to properly use therefore I'm a bit sceptical using the simulating software.
Longer port means lower tuning? I'm limited with enclosures depth with around 11cm for the ports length. So leaving a few centimetres after the inside port opening might be advisable?
Thanks everyone for your replies, N
You're welcome!
This calculator specs a bit too long a vent, so tunes it a little lower, though wouldn't normally be audible. Since it doesn't do multiple vents, there's no frictional losses accounted for, so may be audibly lower if tuned > ~40 Hz. Again, not normally an issue unless trying to tune to exact Fs for whatever reason.
A pipe's basic end correction is radius*0.613, so 3x this length is a good plan, but folks tend to just use the vent's diameter.
GM
This calculator specs a bit too long a vent, so tunes it a little lower, though wouldn't normally be audible. Since it doesn't do multiple vents, there's no frictional losses accounted for, so may be audibly lower if tuned > ~40 Hz. Again, not normally an issue unless trying to tune to exact Fs for whatever reason.
A pipe's basic end correction is radius*0.613, so 3x this length is a good plan, but folks tend to just use the vent's diameter.
GM
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