How to messure standing waves?

  • Thread starter Thread starter Firsthand
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Firsthand

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Hello all!

I have nearly finnished the controll room.
Now i'l have to do some messurements e.g. standing waves.

How should i do this and wich equipment do i use for this?

Manny thanx

Ferry
 
Ferry,

Just play some low frequency sine waves and walk around the room listening for places where the tones get louder and softer. Start by playing 80 Hz. and walk around. Then try 100 Hz., and so forth. It will be pretty obvious where the various frequencies drop out around the room.

--Ethan
 
There are actually a few different types of room modes: Axial Modes, Tangental Modes, and Oblique Modes. Concentrating on axial modes. . . to figure them out with math use the formula f=1,130/2d. . . f would be the frequency of the mode, d being a measurement of the room (ie how high, deep or wide). This frequency you get is the lowest frequency mode and its harmonic intervals can be found by multiplying the initial frequency by 2, 3, 4, etc. . . Dont bother with any frequency much over 300 Hz as they are not usually that problematic. After you calculate the modes and harmonic intervals (upto 8) you can make a chart out of them by placing the harmonic intervals along the y-axis and the H, L and W along the x-axis. Cheers
 
Re: Re: How to messure standing waves?

Ethan Winer said:
Ferry,

Just play some low frequency sine waves and walk around the room listening for places where the tones get louder and softer. Start by playing 80 Hz. and walk around. Then try 100 Hz., and so forth. It will be pretty obvious where the various frequencies drop out around the room.

--Ethan
Click to expand...

Isn't that too simplistic Ethan. If your using mains I would agree, but for nearfields, just moving your head 12 inches in one direction can give you the illusion of standing waves coming of the console or a wall, ceiling. Would hooking up some home speakers which are usually bass heavy anyways be more useful because of the bigger sweet spot projection?
Just a thought...

SoMm
 
Re: Re: Re: How to messure standing waves?

Son,

> Isn't that too simplistic <

Not at all! Most people have no idea their room has such serious response anomolies, and doing that test is a real eye opener.

> Would hooking up some home speakers which are usually bass heavy anyways be more useful <

No. The peaks and dips are relative, so what you listen for is the changes in response.

--Ethan
 
Thanks Ethan.

Maybe I try to hard to make things more complicated;)

I need to have that Quest wireless guy...

Can you hear me now...Can you hear me now ... ;)

SoMm
 
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