Simpel Questions

Hi, The Link for the Corner Absorbers calculation doesn't work. http://www.johnlsayers.com/HR/index1.htm 1) Is it the same calculation like for the Helmholtz Resonators? http://www.johnlsayers.com/phpBB2/viewtopic.php?t=1363 2) If I built a Helmholz into the corner, is the wall distance the same like on the Helmholz calculater if I want to get the wished freaquence? 3) Is there any calculation tool for Bass Traps? 4) Do i have better acoustic results if I put the Speakers into the wall or an Basstrap like it's done on this picture? http://www.johnlsayers.com/Studio/Mainpage/MP-Sonar.htm Greez Djordjo

Djordjo, welcome; your first stop needs to be here - http://www.johnlsayers.com/phpBB2/viewtopic.php?t=4062 And yes, the second link is one of the VERY few on the web that uses the CORRECT formula. For corner absorbers, use the AVERAGE depth of the trap for calculations. No actual "tool" as yet for bass traps (assuming you mean Panel resonators), but the formula is about halfway down on this thread http://www.johnlsayers.com/phpBB2/viewtopic.php?p=27167 BTW, please excuse the rant on that thread; it's pretty rare that someone finds a way to irritate me that much. 4 - yes, much better; this is called soffit, or flush, mounting and it will improve the sound field at the mix position noticeably. If you notice, nearly all of John's studio designs incorporate this - and with good reason. Again, welcome; please update your profile with a location, as mentioned in the first link. Thanks... Steve

knightfly wrote:

Djordjo, welcome; your first stop needs to be here - http://www.johnlsayers.com/phpBB2/viewtopic.php?t=4062 Again, welcome; please update your profile with a location, as mentioned in the first link. Thanks... Steve

Hi Steve, thank you for welcoming and answering me i updated my profile and now you can see where I'm located. I read the referenz links but i was not able to find the information that i was searchin for.

knightfly wrote:

And yes, the second link is one of the VERY few on the web that uses the CORRECT formula. For corner absorbers, use the AVERAGE depth of the trap for calculations.

I hope my next question is not to stupid... How can I take the average depth of an triangle like it is in corners? Or for this exampel:

knightfly wrote:

No actual "tool" as yet for bass traps (assuming you mean Panel resonators), but the formula is about halfway down on this thread http://www.johnlsayers.com/phpBB2/viewtopic.php?p=27167

I think you mean this one... Works this this formula correct with Metric sizes?

knightfly wrote:

BTW, please excuse the rant on that thread; it's pretty rare that someone finds a way to irritate me that much.

I see you made some hard decisions for your privat life. :D I'm moderating a Political Discussion Forum with 500 posts in a day, with kickin Users out of the the Forum and with murder threats via pm. But the most frustrating thing is that there is no solution. Your dealin the whole time with opinions. You know there is no calculater so that you can say...hej the solution is 2,444. :D I spend nearly 4 houers the day on this, I get no money and maybe once in 3 months some one says thank you because i was not kickin him. :D

knightfly wrote:

4 - yes, much better; this is called soffit, or flush, mounting and it will improve the sound field at the mix position noticeably. If you notice, nearly all of John's studio designs incorporate this - and with good reason.

Ok then I'm gone do it like this. Thanks for your answer :wink:

For a slanted wall or a corner trap, the average depth is found by adding the minimum depth to the maximum depth, and dividing that sum by two. So your example of 100mm to 300mm depth would be 100 + 300 = 400mm, divided by two = 200mm. This would be the value you enter into the cell for depth from wall to see the center frequency; however, you can also enter the minimum and maximum depths to see the RANGE of frequencies that will be affected. Works this this formula correct with Metric sizes? No, you would need to convert to inches/pounds first or calculate a new formula; I probably won't get enough time to do an Excel file that does both metric and english units until the wet weather gets here.