New and improved Room Mode Calculators and more

[PaulP]

Great stuff !

Thanks.

Paul P

[avare]

Wonderful. Thank you.

Andre

[Dange]

Can you just confirm that these are the correct dimension for the First Reflection Calculator?

[DanDan]

Well done John, thanks.
DD

[jhbrandt]

Originally Posted by Dange

Can you just confirm that these are the correct dimension for the First Reflection Calculator?

Yes, this works for any surface in any direction between the speaker and operator. For surfaces behind the speaker or operator, use negative numbers. It's all relative. - works especially well for the 'Surface Reflection Calc' section.

Cheers,
John

[johndykstra]

John,

Great calcs.

Do you have any insight in how to calculate modes of a non-rectangular space?

[jhbrandt]

"Do you have any insight in how to calculate modes of a non-rectangular space?"

Honestly, I really don't want to even try.. haha!

Guys, there was an error on the Surface Reflection Calculator which is now fixed.. sorry 'bout that.

Cheers,
John

[DanDan]

Those Calcs are about the most useful and easiest to get into that I have seen.
STICKY plse Jay!
DD

[macc]

Bump, and thanks!

[VoiceManMike]

John,

This is wonderful.

Thanks you very much.

[andrebrito]

You can do rom modes calculation using FEM software but it is a pain in the ass to be honest

[RJHollins]

Thanks John,

Nice work !

[jhbrandt]

Okay guys. I have added some new stuff to the First Reflections Calc.

Get the latest copy.

http://jhbrandt.net/FirstReflectionCalculator.xls

Cheers!
- John

[petertjed]

Dear Mr. Brandt,

I downloaded the Roommodecalculator and put in the lowest ceiling height to get an idealroom and looked at the Ideal Rooms tab. Can you tel me when i put a height of 2.51 table d is a yes ans table e is an no?

My room in which i want to build my mix room in is 2.66 heigh, 3.8 width and a depth of 5.45. I want to build a room in a room so i need space for sound proofing. My first intention was to make the room with the ratio's of table e. Can you explain why it is a no?

Best regards,

Peter Draaisma

[jhbrandt]

Peter,

It is a volume issue.

I programmed that section to immediately flag a room of less than 42 cubic meters (1500 cu. ft.) because there are too few modes and very large spacing between them in such small rooms. Not ideal. That's all.

Be sure to run the dimensions in the 'all modes' section. You will see that many otherwise 'perfect' ratios will yield horrible results when facing 'real' dimensions.
Don't assume that you have a good ratio and go for it without checking. Also know that ONE inch or centimeter will make a huge difference is some cases.

And don't forget to check the red bars on the Bonello distribution chart. Blues higher than reds = good / the inverse is bad.

Cheers,
John

[andreconde]

It seems that whatever I do I can't refresh any of the charts.

Did ctrl + shift + s and c as stated.

Using Excel on Mac OS X.
Any clues?

Thanks.

[jhbrandt]

Andre,

I know nothing of Macs. I'm sorry. It could be that the function keys are different. Also be sure to enable macros, etc... and/or lower the security level.

Cheers,
John

[Jaypin]

Thanks for the Calcs, John. Some detailed work there.

Andre I use a Mac also and can't refresh the charts. I think it's because the charts require the Macros to run, but upon opening Excel, the program states that the Visual Basic macros don't work (in Office 2008 for Mac). Unfortunately I don't see a way around it on a Mac.

[jhbrandt]

Does anyone have the 'open office' stuff? (free) Maybe it would work there? Can someone check it out for Macs?

[audiothings]

Thanks a ton John. Good on you.

I'm using Openoffice for Mac. Other stuff seems to be working fine, but the bonello graph looks like this. Had me scratching my head for a while, till I loaded it on a PC to see the red and blue bars.

[gullfo]

Originally Posted by jhbrandt

Does anyone have the 'open office' stuff? (free) Maybe it would work there?

the first reflection worksheet functions (after converting) on Google Docs but it doesn't support the graphics and some of the formating. (in general spreadsheets with Macros or fancy layouts struggle on Google Docs...) the other spreadsheets are too large to convert (limit is 1Mb). if we could get these under 1Mb it might be possible to use as Google Docs.

[papanauta]

Originally Posted by jhbrandt

Does anyone have the 'open office' stuff? (free) Maybe it would work there? Can someone check it out for Macs?

jhbrandt

I'm using it on a powerbook g4 with exel 2004 for mac, and it seems to work fine.

great tool BTW and thanks for sharing it.

Saludos

[Jens Eklund]

Originally Posted by johndykstra

John,

Great calcs.

Do you have any insight in how to calculate modes of a non-rectangular space?

SoundEasy form Bodzio does this (FEM model):

Q 4 Avare

/Jens

[Flexable]

These are the maximum dimensions that I have at my disposal.
For an controlroom.
(240cm H x 384cm L x 340cm W)

Is this advisable?

Thank you.

[Rod Gervais]

Great stuff here John - thanks.

Rod