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Re: Plotting a room response

Posted by Ethan Winer (M) on March 23, 2006 at 12:14:04

In Reply to: Plotting a room response posted by T-Rex on March 23, 2006 at 01:50:54:

Rex,

> I'm trying to plot a room's frequency <

Understand that raw response is only half the story for low frequency room analysis. Ringing is just as important, but it takes more than a simple frequency analysis to see that. I use the ETF software. What do you have?

> What frequency bins should I use? (1hz, 5 hz or other...) <

The finer the resolution, the better. So if the best you can do is 1 Hz, definitely use that.

> Should each instance of a modal frequency be plotted as a single point <

You need to plot the level at every single frequency measured. If you measure, say, 40 Hz to 300 Hz in 1 Hz increments, you should plot all 261 points.

All of that said, you don't really need to measure anything since the solution is always the same anyway: Broadband absorption that works well to as low a frequency as possible. The main reason to measure is to assess the before / after improvement from adding bass traps.

--Ethan

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