### Calculator for 1st reflection points

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#### poseidonsvoice

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##### Calculator for 1st reflection points
« on: 24 Nov 2015, 03:11 pm »
There are a lot out there (like Ethan Winer's, etc...), and some of us don't want to be bothered with using a mirror as our primary method of obtaining the 1st reflection points in a symmetrical room (non symmetrical rooms, I'm sure the mirror helps quite a bit); so here is a nice calculator that figures out all the 1st reflection points for you:

http://www.acoustic.ua/forms/calculator4.en.html

Best,
Anand.

#### rodge827

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##### Re: Calculator for 1st reflection points
« Reply #1 on: 24 Nov 2015, 04:42 pm »
Anand,

Thank you for posting this!
I had gotten close with the mirror but now my room sounds much better!

Chris

#### Rob Babcock

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##### Re: Calculator for 1st reflection points
« Reply #2 on: 24 Nov 2015, 07:41 pm »

#### Big Red Machine

##### Re: Calculator for 1st reflection points
« Reply #3 on: 24 Nov 2015, 08:02 pm »
My first thought was that by the time you measured all the distances you could have found the spots with the mirror in less time!

#### Devil Doc

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##### Re: Calculator for 1st reflection points
« Reply #4 on: 24 Nov 2015, 08:13 pm »
Too much math and in the metric system, no less. My mirror works just fine.

Doc

#### poseidonsvoice

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##### Re: Calculator for 1st reflection points
« Reply #5 on: 24 Nov 2015, 09:09 pm »
Too much math and in the metric system, no less. My mirror works just fine.

Doc

There is no reason to use metric. You can input the numbers in feet/inches or cm/meters. I do it in inches, works fine.

Best,
Anand.

#### poseidonsvoice

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##### Re: Calculator for 1st reflection points
« Reply #6 on: 24 Nov 2015, 09:29 pm »
My first thought was that by the time you measured all the distances you could have found the spots with the mirror in less time!

Perhaps, but I've become more OCD in my old age

Best,
Anand.

#### brother love

##### Re: Calculator for 1st reflection points
« Reply #7 on: 24 Nov 2015, 10:55 pm »
Perhaps, but I've become more OCD in my old age

Best,
Anand.
If you are really OCD, you measure, then do the calculations to be absolutely sure! Of course, all results are in an Excel spreadsheet. [Disclaimer: I'm guilty as charged].

Thanks Anand. Both the Great Room Mode Calculator & 1st Reflection Points Calculator are very cool.

#### poseidonsvoice

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##### Re: Calculator for 1st reflection points
« Reply #8 on: 24 Nov 2015, 11:43 pm »
If you are really OCD, you measure, then do the calculations to be absolutely sure! Of course, all results are in an Excel spreadsheet. [Disclaimer: I'm guilty as charged].

Thanks Anand. Both the Great Room Mode Calculator & 1st Reflection Points Calculator are very cool.

I agree, and thank you

Best,
Anand.

#### Big Red Machine

##### Re: Calculator for 1st reflection points
« Reply #9 on: 25 Nov 2015, 12:37 am »
Perhaps, but I've become more OCD in my old age

Best,
Anand.

I hear ya.

#### ted_b

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##### Re: Calculator for 1st reflection points
« Reply #10 on: 25 Nov 2015, 01:57 am »
I've always used this.  Works great.  Three measurements, simple math.

#### rodge827

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##### Re: Calculator for 1st reflection points
« Reply #11 on: 25 Nov 2015, 03:17 am »
There is no reason to use metric. You can input the numbers in feet/inches or cm/meters. I do it in inches, works fine.

Best,
Anand.

I measured inches and converted into cm!
It only took a few minuets longer, but the results were worth it.
Using a mirror I got the first reflection point to the outside of the driver. What I didn't get with the mirror was the reflection point from the inside of the opposite driver. I had a 2'x2' area covered, and now it's 3'x2' placed horizontally.

Chris

#### poseidonsvoice

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##### Re: Calculator for 1st reflection points
« Reply #12 on: 25 Nov 2015, 03:50 am »

I measured inches and converted into cm!
It only took a few minuets longer, but the results were worth it.
Using a mirror I got the first reflection point to the outside of the driver. What I didn't get with the mirror was the reflection point from the inside of the opposite driver. I had a 2'x2' area covered, and now it's 3'x2' placed horizontally.

Chris

New converts. Just one at a time

Best,
Anand.

#### undertowogt1

##### Re: Calculator for 1st reflection points
« Reply #13 on: 16 Oct 2019, 02:25 am »
There is no reason to use metric. You can input the numbers in feet/inches or cm/meters. I do it in inches, works fine.

Best,
Anand.
I just made some sound baffles and I am going to give this calculator a try. Do I just enter in INCHES?  I dont see where to change from cm to inches etc.?

#### poseidonsvoice

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• Science is not a democracy - Earl Geddes
##### Re: Calculator for 1st reflection points
« Reply #14 on: 16 Oct 2019, 12:26 pm »
Hi!

It doesn’t matter if it is inches, cm, or meters. It’s relative, because it is based on ratios. Just be consistent throughout the equation.

Best,
Anand.

#### undertowogt1

##### Re: Calculator for 1st reflection points
« Reply #15 on: 16 Oct 2019, 12:45 pm »
I see. Very cool. Thank you.

#### AudioDwebe

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• Posts: 35
##### Re: Calculator for 1st reflection points
« Reply #16 on: 21 Oct 2019, 12:30 am »
This is so very cool, and timely, as I get my other shipment of GIK 244s tomorrow.  The shipment was split and a few boxes arrived a week before the other.

Thanks.

#### timind

##### Re: Calculator for 1st reflection points
« Reply #17 on: 21 Oct 2019, 01:07 am »
Pretty cool the web page is still active; not often the case with a four-year-old link. Figuring all those angles reminds me of playing pool.