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Process for measuring in-room frequency response?
#123736 01/10/06 06:09 PM
Joined: Mar 2003
Posts: 320
devotee
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Hi all--

Is it really as simple as it seems? Here's what I was planning for this 2.1 set-up, and am wondering if I'm missing anything.

1) Use my analog radio shack SPL meter, c-weighting, set on a tripod at the main listening position
2) Use a tone generator like this nifty one I found online
3) Use the pink noise test tone with this generator and set the overall volume (with both L & R speakers and subwoofer operating) such that I'm at a reference sound level (e.g. 85dB)
4) Run test tones from 16Hz all the way up to ~20Khz, recording the meter readings at each frequency
5) Apply any dB adjustments based on known measurement errors of the meter
6) I now can graph the FR of my room

So what else am I missing? Anything else I need to be aware of, or take into account?

The tone generator allows you to generate sine waves and many other wave forms. I'm assuming sine is the way to go?

By the way, the receiver is a Pioneer 55TXi that allows me to plug a USB cable directly into it from my laptop. So I don't think I'm introducing anything there, am I?

As usual, thanks in advance for everyone's assistance.
Rich

Re: Process for measuring in-room frequency response?
#123737 01/10/06 10:47 PM
Joined: Aug 2004
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axiomite
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Unless this is a trick question with some kind of subtle twist, I think you have the process spelled out correctly. I wouldn't bother going all the way up to 20 KHz, in fact other than finding resonances it probably isn't worth going past 500 or 1000 Hz.


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Re: Process for measuring in-room frequency response?
#123738 01/11/06 02:20 PM
Joined: Mar 2003
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Thanks bridgman. No trick question, just a sincere desire to understand if I was missing anything obvious.

The real reason to go all the way through to 20 Khz is for the educational experience. It was interesting that my hearing pooped out around 16 Khz, but my boys were still able to hear beyond that when we were playing around with this tone generator.

My room is also pretty large (opens to other rooms really), is oddly shaped, and I seem to have some holes in certain frequencies (but don't have enough experience to know what frequency/ies without going through this experiment).

Can anyone tell me what the frequency bands are that correspond to bass, mid-bass, mid-range (and any subdivisions of that band), etc?

Thanks!
Rich


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