## Spreadsheet for a DIY Skyline-type diffuser

Tools for acoustic calculations -

### Spreadsheet for a DIY Skyline-type diffuser

I created this to figure out how to build my own RPG Skyline type diffuser. I discovered that to build one, It would weigh too much and cost as much as buying one from RPG. FWIW, by popular demand, here it is.
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stickjam

Posts: 32
Joined: Thu Jun 03, 2004 2:53 pm
Location: Grand Rapids. MI

where is the spreaksheet?
rockstar

Posts: 2
Joined: Tue Dec 21, 2004 10:46 pm
Location: berlin

rockstar

Posts: 2
Joined: Tue Dec 21, 2004 10:46 pm
Location: berlin

rockstar:
Right mouse over the word 'download', and choose Save Target As. That usually works with Internet Explorer.
Bob

Posts: 4360
Joined: Sun Feb 08, 2004 4:37 am

I'd be very interested to know what prime number (my guess is 157) and what primitive root you chose (no clue at all) to create the primitive root sequence.

I have been trying for hours... but I don't seem to be able to find the adequate combination.

On the other hand I have been studying quadratic residue bidimensional sequences that seem to have a very estethic periodicity (like circles) that might look very nice in big patterns (179x179).

I don't know. I might try to build one myself, but it looks like it might take ages...

trotz

Posts: 7
Joined: Thu Feb 12, 2004 10:58 pm

Pics or it didn't happen!

SRF
Scott R. Foster

Posts: 3854
Joined: Mon Feb 02, 2004 12:41 pm
Location: Jacksonville, FL USA

You want proof? Here are the facts.
:D  :D

I'm confident some cabalistic secret society can make good use of this...
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trotz

Posts: 7
Joined: Thu Feb 12, 2004 10:58 pm

ok, I found... primitive root is 5. Only that the maximum number that my spreadsheet is able to handle is 5 to the power of 23... I imagine I should use some program like Mathematica to reach the end of the series.

Also some "lateral thinking" is needed since the series is followed longitudinally in the skyline, not in columns or rows.

Now I only need to find a way to calculate the series for 1297 and some primitive root of it. pheeew.

BTW it's 4.00 am. I'd better go to sleep

trotz

Posts: 7
Joined: Thu Feb 12, 2004 10:58 pm

I am new here.

Just enquiring has anyone built a Skyline using the above model?

Ian
Mackenzie

Posts: 1
Joined: Sat May 05, 2007 10:30 pm

I know someone who has built one of these with expanded polystyrene.  He just used small but long rectangular blocks and glue them all together... quite a bit of work but costed him 50 € I believe lol
http://www.onlineacoustics.com - room acoustics projects and diffusers
andrebrito

Posts: 944
Joined: Mon Oct 25, 2004 2:01 am
Location: London, uk

### Re: Spreadsheet for a DIY Skyline-type diffuser

simulation emprunt immobilier
catherina

Posts: 1
Joined: Sat May 09, 2009 7:57 am

### Re: Spreadsheet for a DIY Skyline-type diffuser

You are one boogle away from the answer...

http://www.bobgolds.com/DifuserKgveteran/home.htm
I try never to get involved in my own life. Too much trouble.
Zaphod

Posts: 1931
Joined: Wed Jul 28, 2004 9:51 pm
Location: Rome, Italy

### Re: Spreadsheet for a DIY Skyline-type diffuser

Bob

Posts: 4360
Joined: Sun Feb 08, 2004 4:37 am