Room Mode Calculator and Converter - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

Old 03-09-07, 08:28 AM
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Naut

Join Date: Apr 2006
Location: Richmond, VA
Posts: 606
Re: Room Mode Calculator and Converter

I have tried quite a few of these.
The one I like best is by Eric Desart.
His website is gone, but you can find the file at

http://forum.studiotips.com/large_fi...Calculator.zip

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Old 03-17-07, 05:52 PM
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Derek

Join Date: Jul 2006
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Re: Room Mode Calculator and Converter

All of these tools just accentuate how much I have to learn - they are all pretty much greek to me. Is there any online "crash course" out there that will allow me to at least make use of the basic functionality? Or would that be like asking for a crash course in graduate quantum mechanics for someone who is just starting to understand classical mechanics....?

"Ya see, we plan ahead. That way we don't do anything right now. Earl explained it to me." - Valentine McKee

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Old 03-17-07, 06:20 PM
Jerry

Join Date: Mar 2007
Location: Isle of Kent Maryland
Posts: 50
Re: Room Mode Calculator and Converter

The link I posted gives you an Excel Spreadsheet that runs some Visual Basic Code automatically. First you input the dimensions of your room, length, width and height. You can input your listening position by calculating the position of your head away from the front, left wall and floor. Then you put in the location of your subwoofer, up to two subwoofers. Same way distance from front, left wall and floor. By moving the location of the sub or subs you can see the peaks and valleys that are due to the standing waves generated by reflections in the room. You can change the reflectivity of the surfaces too. So a hard smooth wall of drywall or plaster would be very reflective. A carpeted floor would be less so.
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Old 03-17-07, 08:34 PM
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Derek

Join Date: Jul 2006
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Re: Room Mode Calculator and Converter

Thanks, Jerry!

"Ya see, we plan ahead. That way we don't do anything right now. Earl explained it to me." - Valentine McKee

One sub to rumble them all. One sub to shake them. One sub to humble them all. And in the darkness break them....

The Overlook Theater - Not liable for injuries sustained while laughing.
Old 03-18-07, 08:50 AM
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Derek

Join Date: Jul 2006
Posts: 402
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Re: Room Mode Calculator and Converter

When trying to use the room dimensions mode calculator in this thread (post #1), I can get it to come up ok (I have the macro security set to 'medium, so I can use macros fine), and I can enter my room dimentions with no problem. But when I hit the 'Plot' button, I get the following error:

Quote:
Run Time Error '1004'
Application-defined or object-defined error
and hitting the 'Debug' button yields

Quote:
OrderCustom:=1, MatchCase:=False, Orientation:=xlTopToBottom, _
DataOption1:=xlSortNormal
At first, I thought I merely forgot to install VB with Excel, but that is not the case either. Does this mean anything to anybody? I am using Excel 2000 (I downloaded the calculator version "for all versions older than Excel 2003"), and WindowsXP Home. Thanx!

"Ya see, we plan ahead. That way we don't do anything right now. Earl explained it to me." - Valentine McKee

One sub to rumble them all. One sub to shake them. One sub to humble them all. And in the darkness break them....

The Overlook Theater - Not liable for injuries sustained while laughing.
Old 03-18-07, 04:18 PM
Gizmo

Join Date: Dec 2006
Location: Holland
Posts: 36
Re: Room Mode Calculator and Converter

Room calculations, tried some but when i input the height etc etc and it made a calculation, i see 2 rows and then copie them for txt file but its all weird. I included a txt file. Maybe a stupid question but can there be a page made for dummies like the BFD?
Attached Files house1.txt (149 Bytes)

Last edited by Gizmo; 03-19-07 at 03:40 PM.
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Old 06-03-07, 02:59 PM
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Dave

Join Date: May 2007
Location: Victoria, BC, NA, Sol III
Posts: 90
Re: Room Mode Calculator and Converter

Quote:
Sonnie;2011.xls file: [URL="http://www.hometheatershack.com/roomcalculator.xls" wrote:
Room Dimensions Mode Calculator[/URL] (Excel 2003 only)

.xls file: Room Dimensions Mode Calculator (for older Excel versions)
Neither of those will generate a plot in Excel 2004 giving an error on this line

Quote:
OrderCustom:=1, MatchCase:=False, Orientation:=xlTopToBottom, _
DataOption1:=xlSortNormal
I did write a rectangular mode calculator in 360 assembler back in the mid 70s... maybe i'll have a look at fixing this ... (but excel is such a kludge...)

dave

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Old 06-03-07, 04:17 PM
hardman
Inactive

Posts: n/a
Re: Room Mode Calculator and Converter

Sorry to hear some of you are having difficulties in getting the Excel doc to work correctly. Not sure what is causing the issues (works fine for me…), but Ethan has a similar program on his site that runs without needing Excel. I suggest you all try his application. www.realtraps.com/modecalc.htm

Also, please note this approach (my Excel doc) to room mode discovery is very basic at best. Its intended purpose was to help assist in determining the best room dimensions for new construction.
Old 06-03-07, 05:44 PM
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Dave

Join Date: May 2007
Location: Victoria, BC, NA, Sol III
Posts: 90
Re: Room Mode Calculator and Converter

Quote:
hardman wrote: View Post
I suggest you all try his application. www.realtraps.com/modecalc.htm
Windows only... so no dice.

dave

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Old 10-24-07, 04:30 PM
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Sebastian

Join Date: Apr 2006
Posts: 14
Re: Room Mode Calculator and Converter

I agree not to get too hung up on room modes. Many rooms designed from scratch won't be rectangular. Plus, the rooms we are talking about will usually have lots of absorption. Thirdly, For an existing room, or a room once it is built, the room needs to be fine-tuned anyway, so the modes must be verified by testing.

The theory is nice to have but it also assumes that the room boundaries are hard and rigid. At very low frequencies this is probably not true for non-masonry walls (ie plasterboard or sheetrock or whatever u guys call it stateside). So, again, that means testing.

When I am designing a room I make sure that the room dimensions are not integer multiples of each other, then I check the room mode calcs but I don't get obssessive and check 200 different combinations (ok maybe 10 or 20), and then I allow for tuned absorption treatment.
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