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[Sonovo]

I've been making measurements lately with some new toys (hardware/software), and became curious as to whether there are clear and established methodologies for measuring room response, esp. with the swept sine method.

Does anyone have a checklist or routines to ensure one generates valid data (or at least good enough to actually move to attempt interpreting the results)?

Best regards,
Thor

[Ethan Winer]

Sonovo wrote on Fri, 12 September 2008 17:59

Does anyone have a checklist or routines to ensure one generates valid data (or at least good enough to actually move to attempt interpreting the results)?

Most important is playing the test signal loud enough to be at least 40 dB or more above the ambient room noise at all frequencies. Nulls can be 30 dB deep or even deeper, so the ambient noise must be at least 10 dB below that at all frequencies.

Manual sine wave sweeps are okay, but dedicated software is much better. Good programs are more accurate and also show more things such as ringing and decay times and individual reflections. Here are the three programs I'm familiar with:

ETF, Windows, $150

FuzzMeasure, Mac, $150

Room EQ Wizard, Windows and Mac and Linux, Freeware

This article explains how I use ETF, but the principles apply to all such programs.

--Ethan

[Sonovo]

Hi Ethan,

thanks, I'm using Fuzzmeasure on the Mac.

Getting above the ambient noise I was aware of, but now I have an idea as to how much.

Will have another go at it and see how things turn out.

Cheers,
Thor

[franman]

Let us know how you do with fuzzmeasure.. We use TEF around here mostly but I've been playing with Fuzzmeasure and it really look like a powerful tool, but I need more time to play with it to correlate the results with the TEF.. (to be sure I know what I'm looking at).

[KAyo]

Hi Ethan,

I am about to get into the whole measuring bit of things.
Quick questions: What microphone? I know it should be omni. Yes/?
And what if you also have traffic going past at measuring time.. hahaha

ta mate.
Kayo

[Ethan Winer]

KAyo wrote on Sun, 09 November 2008 01:05

What microphone? I know it should be omni. Yes/?

Here you go:

Comparison of Ten Measuring Microphones

Quote:

And what if you also have traffic going past at measuring time

You measure again after the traffic passes.

--Ethan