Hello everyone,
I was wondering a few days ago about building enclosures.. My thoughts were how to get the best results when building them. Then some sorta of questions poped
...
I guess this thread might be usefull for people that are looking for DIY enclosures.
I've already searched but w/o any results for a How-to/Guide on building Boxes. I've already seen projects that I can take some tips here and there.. but nothing really detailed.
Some doubts I have...
I - Why ports have to stay at least some inches far from any wall of the box? And how much distance is considered safe?
II - What is the difference between placing a driver in the front of the box, in the top of it or in the bottom(assuming there is some few inches from the floor .. )
III - The Port and the Driver must be in the same wall ? If not what are the effects in different walls?
IV - What about Flared Ports? I Couldn't find them in Brasil. 🙁 Does it makes much difference?
V - Retangular/Squared Ports versus Rounded (pipes) Ports.. What is good in these two applications.. and what isn't?
VI - Stuffing the box. What are the bennefits?
You might put some other tips to help me building my ported/whatever other kind of enclosure 🙂
Maybe we can make this thread a guide.. 🙂
Hope so.. LoL..
Thanks
I was wondering a few days ago about building enclosures.. My thoughts were how to get the best results when building them. Then some sorta of questions poped
...I guess this thread might be usefull for people that are looking for DIY enclosures.
I've already searched but w/o any results for a How-to/Guide on building Boxes. I've already seen projects that I can take some tips here and there.. but nothing really detailed.
Some doubts I have...
I - Why ports have to stay at least some inches far from any wall of the box? And how much distance is considered safe?
II - What is the difference between placing a driver in the front of the box, in the top of it or in the bottom(assuming there is some few inches from the floor .. )
III - The Port and the Driver must be in the same wall ? If not what are the effects in different walls?
IV - What about Flared Ports? I Couldn't find them in Brasil. 🙁 Does it makes much difference?
V - Retangular/Squared Ports versus Rounded (pipes) Ports.. What is good in these two applications.. and what isn't?
VI - Stuffing the box. What are the bennefits?
You might put some other tips to help me building my ported/whatever other kind of enclosure 🙂
Maybe we can make this thread a guide.. 🙂
Hope so.. LoL..
Thanks
Hi Arthur,
Firstly I'd recommend the Loudspeaker Design Cookbook (LDC) by V.Dickason. It will answer all your questions and a lot more and if you're just starting out.
1) the space is required to ensure enough air can escape into the port to function properly. I usually count the cross section of the port as a safe distance.
2) As frequency increases, it becomes more directional. Mids and tweets are always placed in the front. Depending on the frequencies your sub plays, you may be able to place it on top/bottom without noticable difference.
3) The port is just another sound source. It contributes sub low frequencies and can usually be placed on any wall.
4) Flared ports exhibit less power compression than straight ports.
5) There is no functional difference. They will both do the same job, but slot ports are inherently more rigid and add to the bracing of the cabinet. Round ports look nicer to some eyes.
6) Stuffing, or damping increases the enclosure internal volume. In theory you can use a smaller enclosure for a given driver, but is also important to break up standing waves.
Firstly I'd recommend the Loudspeaker Design Cookbook (LDC) by V.Dickason. It will answer all your questions and a lot more and if you're just starting out.
1) the space is required to ensure enough air can escape into the port to function properly. I usually count the cross section of the port as a safe distance.
2) As frequency increases, it becomes more directional. Mids and tweets are always placed in the front. Depending on the frequencies your sub plays, you may be able to place it on top/bottom without noticable difference.
3) The port is just another sound source. It contributes sub low frequencies and can usually be placed on any wall.
4) Flared ports exhibit less power compression than straight ports.
5) There is no functional difference. They will both do the same job, but slot ports are inherently more rigid and add to the bracing of the cabinet. Round ports look nicer to some eyes.
6) Stuffing, or damping increases the enclosure internal volume. In theory you can use a smaller enclosure for a given driver, but is also important to break up standing waves.
Start with what kind of speaker you want? Subwoofer, centre channel, full range (2-way, 3-way...)? Then you should select the drivers. Then you can design the enclosure around the drivers.
Thank you very much for the info. As I live in Brasil actually I couldn't find the Loudspeaker Cook Book .. ASA I get in America I'll look for it.... I'm looking for building a subwoofer enclosure 🙂
front or rear port
Am I correct in understanding that sound from the port is 180 deg. out of phase with the driver? If that's correct, shouldn't the port be in the rear panel if possible?
Am I correct in understanding that sound from the port is 180 deg. out of phase with the driver? If that's correct, shouldn't the port be in the rear panel if possible?
Well, the 180 degree phase difference increases with lower frequency and is nearly reached only when the frequency gets down well below the response of the combined output of the speaker and enclosure. At some point above that, the outputs from both sources are in phase, and that is where the boost in response occurs.
I love the animation on this page for showing the interaction of the driver/vent:
http://www.hometheaterhifi.com/volume_5_2/cmilleressayporting.html
GM
http://www.hometheaterhifi.com/volume_5_2/cmilleressayporting.html
GM
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