speaker frequency response measurement

[Shivaprashanth Hiremath]

I recently purchased dayton imm6 mic for android phones. installed audiotool software. i am fairly new to the whole measurement topic. please guide me how do I take freq. response measurement for my speakers? link to step by step guide will be very helpful.

[Julian Bunn]

The AudioTool manual (linked via the Menu) describes how to use the app in detail.

Making frequency response measurements of loudspeakers is certainly possible with AudioTool, but I do not have a step by step guide, I'm afraid.

Julian

On Fri, Feb 27, 2015 at 12:02 PM, Shivaprashanth Hiremath <sshirem...@gmail.com> wrote:

I recently purchased dayton imm6 mic for android phones. installed audiotool software. i am fairly new to the whole measurement topic. please guide me how do I take freq. response measurement for my speakers? link to step by step guide will be very helpful.

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[til...@gmail.com]

I bought AudioTool and the Dayton mic just to measure the frequency response of the speakers I build. I've been able to make AT produce rising test tones but haven't been able to record it. I'd like to see a simple graph, (I'm a simple man).

I'm sure this is a no brainer for Audio guys but you might expand your market if you typed out instructions for basic test for the hobbyist.

Thanks, Mack
Melbourne Aus

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[Julian Bunn]

This is briefly described with an example in the manual:

https://sites.google.com/site/bofinit/audiotool#TOC-Frequency-Response-with-Sweeps

I recommend a slow sweep speed - say 20Hz to 10kHz over a minute or longer. After storing the spectrum file, you will need to use a tool like Excel to make the plot from the peak data in the file.

I hope that helps.

Julian

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[jimko...@gmail.com]

One of the main issues with making freq response measurements of speakers is THEIR LOCATION.
The mounting and coupling to areas changes all responses.
ideally they are measured in an Anechoic Chamber, away from any reflections.
The best you can do is (if they are in boxes) place them outside on a stool, facing to the sky, and measure them from the top, some 2 Mts. above.
You might need a ladder.
Pump in some Pink Noise (with an Amp ?) and measure your spectrum at 1/16 or 1/24th. There you will see reality...
many topics on the Net about this.
If you measure them in their location (room, car, etc.) measure from where the Listener (you ?) would be.
Now you can start fixing the acoustics of the space to get good sound.

Happy learning !
Peace
JimKo

[jimko...@gmail.com]

Be careful if you use Sine-Sweep, start at a low volume !
When the sweep starts at sub-sonics, you won't hear anything, and as it goes up it might easily blow your coils.
I know, been there...!
Peace.

[gfm...@gmail.com]

The more realistic and useful speaker response measurement in my experience and for my purposes would be from your usual listening position which takes into consideration all factors of room acoustics at that location. We Don't listen in an anechoic chamber or out in a field.

[gfm...@gmail.com]

"Now you can start fixing the acoustics of the space to get good sound." Or you could tweak the response of your system with a good 1\3 octave equalizer if your room isn't tweakable.

[Jim Kovacs]

I would go for this secuence=

1. Get a good spectrum analyzer, there are some great Apps for Android I use, like Speedy Spectrum and Audio Tool.

2. Get a good sine-wave generator, also some good Apps like Signal Generator and Frequency Sound generator. BUT, you should have these on another phone so you can use one to generate and one to measure.

3. Start by checking for STANDING WAVES in your listening position by sweeping the sine waves, mainly at low frequencies and finding the dips ana peaks (on either speaker) and measuring those.

You will find that there are frequencies that sound much louder, and those that actually cancel out at your LP(listening position).

THAT you should treat with acoustic panels or absorbers on parallel walls.

GET A STEREO 1/3 OCTAVE GRAPHIC EQ AND HOOK IT INTO THE OUTPUT TO YOUR SPEAKERS (if amplified, directly, if not, just before the Power Amp)

4. Run PINK NOISE (from the generator) and check the flatness on the Spectrum Analyzer. EACH SPEAKER SEPARATELY.

5. Tweak that channel EQ to get the flattest response possible.

Go on to the other speaker and do the same.

It can get much more complex, but this should help you a LOT.

PD. Do you use a seperate SubBass ? If that is the case, everything changes. Let me know.

Greetings from Venezuela, on we go..

Jim Kovacs

4. Use PINK NOISE (on the generator) and

On Sun, Apr 23, 2017 at 3:43 PM, <gfm...@gmail.com> wrote:

"Now you can start fixing the acoustics of the space to get good sound." Or you could tweak the response of your system with a good 1\3 octave equalizer if your room isn't tweakable.

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