slot resonator question

[Bob Mould]

i was thinking about the design of slot resonators the other day, especially the difference in horisontal slats vs vertical slats.
I know that if u have a straight wall where the depth from wall is fixed then it would not matter which way you go 'cause horisontal slats and vertical slats would be equally efficient, but if you have an angled wall what would apply then?

For example if the slats are horisontal then each slat would have a broad frequency range because the depth from wall would vary from the deepest point to the narrowest point of the slat. But if the slats are vertical every slat would have a narrow absorbtion at a specific frequency 'cause the depth from wall would be fixed.
This of course only applies if you keep the slat spacing constant all along the slat. Varying the spacing along the slat would give a broader absorbtion frequency in both cases but when the slats are horisontal then the depth from wall also varies giving even broader frequency absorbtion abilites per slat.

To me it seems that vertical slats would be more flexible on angled walls as they can be both narrow and broad in its absorbtion. Am i thinking right here?

What should one aim for in a control room, the broadest low to low-mid frequency absorbtion possible or being able to control specific frequencies?.

Also is there a way to calculate the amount of absorbtion a slat will have?, For example if i have a room with a 5db raise at 200hz is there a way to calculate how many slats absorbing 200hz i will need?


Thanks
Mike

 

[Bob Mould]

?
Bump

 

[John Sayers]

Hi Mike - as you said - horizontal slats can vary the slat width AS WELL as the depth from the wall.

Left Bank Studio has varying slot width as well as slat width where the depth is fixed in the studio walls but varying in the control room.

What should one aim for in a control room, the broadest low to low-mid frequency absorbtion possible or being able to control specific frequencies?.

I aim for broadband absorption as the aim is to take down the reverb time of all the frequencies of the room evenly.

Also is there a way to calculate the amount of absorbtion a slat will have?,

I haven't found a way yet anyone???

cheers
JOhn

 

[Bob Mould]

thanks a million John!

How do you go about tuning rooms then, are u just using ure ears and experience, or do you pink the room?oscilloscope and a spl meter?
The reason im asking is cause if have started construction on my control room, https://homerecording.com/bbs/showthread.php?threadid=57097 and i think i have most parameters covered in theory but i was thinking i would need to finetune the room in real world somehow when its time to put up slat resonators and absorbtion etc. And im curious how the pros do it!?


Maybe my project might informative for others on the the "studios under construction site"????????

cheers!!!
/mike

 

[knightfly]

I found a spreadsheet that does freq. and bandwidth, but not level of absorption. Interested, here's the link-

www.studiotips.com/tools/slat-eng-met.zip

Best I can do so far... Steve

Just tried that homemade link and don't think it works. Go to studiotips.com, click on calculation tools, and download slat-eng-met.zip from there...

 

[John Sayers]

Ears and experience Bob I tried all the pink noise stuff way back in the 70s. Sure you can fine tune a room with it but I prefer my own ears and a few selected albums.

I feel too many people try to retune rooms with EQ etc. that are way out to start with.

I'd be happy to put your studio up on studios under construction...let me know when you are ready to send pics

Cheers
john

 

[Bob Mould]

Thanks John and Steve...
The link worked fine,,,i will check that out....

Well John thats kinda what i expected that you would do , but if you're not a pro studio designer and not that confident in your ears maybe measurement is more reliable? There's a dealer here in sweden that has a pretty good deal on renting a pink noise measurement kit, so i might just try that!.

i'll have those pics ready in a couple of days...

thanks /mike