Automatic Equalization program??

SkinnyBoy · 29th April 2003, 02:22 PM

As the title sorta says.. I am looking for a computer program, that plays the audio spectrum (from say 20-20,000) and then attempts to adjust the audio output so the speakers have as flat a response as possible. It would obviously have a microphone input too, and the mic could be put in the normal listening position in the room..

good idea? I ask cos I plan to use a simple crossover on my Peerless speaker boxes, actually, I plan to feed the woofers the full frequency and just use a VERY simple filter for the tweeters (I have no money. lol)

phase_accurate · 29th April 2003, 02:35 PM

This one might do the trick, though not within your budget I think:

http://www.tactaudio.com/RCS22X/index.html

Regards

Charles

BTW: I have heard it and it is indeed astonishing

SkinnyBoy · 29th April 2003, 02:38 PM

I'm looking for a computer program..

that thing looks interesting, and expensive..

lol

jackinnj · 29th April 2003, 03:42 PM

but you'll need a calibrated microphone (some of the small electret microphones are reasonably acurate for this purpose -- search for "Mitey Mike" on google)

you can easily make a random noise generator with a diode etc.

Da5id4Vz · 30th April 2003, 05:54 AM

Well,

This one doesn’t use a sweep oscillator, but it is a step in the direction of what you are talking about.

It does not appear to be a complete solution, but a development tool.

http://freshmeat.net/projects/drc/?topic_id=114

Jay · 25th August 2003, 09:29 AM

Quote:

Originally posted by SkinnyBoy
good idea?

I'm afraid the working microphone will cost you a Scan-Speak Revelator...

jackinnj · 25th August 2003, 12:01 PM

the article on the "Mitey Mike" -- someone catch me if I am wrong -- but I believe that it used a Panasonic electret which was pretty inexpensive at the time.

I was thinking that a noise bridge (easy to make -- there are several designs on the web either using a reverse biased diode or CMOS logic for a pseudo-random bridge) and a series of adjustable bandpass filters using digital resistors and a PIC microcontroller would do the trick. Once you decide upon equalization you have already surrendered to some noise in the system.

Circlotron · 25th August 2003, 12:50 PM

Use CoolEdit to generate a 20 or 30 minute wav file of pink noise, (NOT white noise) and burn it to a cd and play it on your system. Then plug an electret mic into your pc sound card and use some of the many real-time spectrum analysers to observe the results.

An electret mic capsule seems to be much more flat if you remove it from any plastic housing it may be inside. Look for my post here.
Calibrating microphone with air hose hiss.

Jay · 25th August 2003, 01:08 PM

Hi SkinnyBoy,

Once you get the true response of your system (including the listening room), how will you adjust the audio output? It is not buying an equalizer, is it?

SkinnyBoy · 25th August 2003, 01:10 PM

most of my music is played off the computer.....

29th April 2003, 02:22 PM	#1
SkinnyBoy Banned Join Date: Nov 2002 Location: Adelaide, Australia	Automatic Equalization program?? As the title sorta says.. I am looking for a computer program, that plays the audio spectrum (from say 20-20,000) and then attempts to adjust the audio output so the speakers have as flat a response as possible. It would obviously have a microphone input too, and the mic could be put in the normal listening position in the room.. good idea? I ask cos I plan to use a simple crossover on my Peerless speaker boxes, actually, I plan to feed the woofers the full frequency and just use a VERY simple filter for the tweeters (I have no money. lol)

29th April 2003, 03:42 PM	#4
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	you can buy a trial-ware FFT program but you'll need a calibrated microphone (some of the small electret microphones are reasonably acurate for this purpose -- search for "Mitey Mike" on google) you can easily make a random noise generator with a diode etc.

25th August 2003, 12:01 PM	#7
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	calibrated microphone the article on the "Mitey Mike" -- someone catch me if I am wrong -- but I believe that it used a Panasonic electret which was pretty inexpensive at the time. I was thinking that a noise bridge (easy to make -- there are several designs on the web either using a reverse biased diode or CMOS logic for a pseudo-random bridge) and a series of adjustable bandpass filters using digital resistors and a PIC microcontroller would do the trick. Once you decide upon equalization you have already surrendered to some noise in the system.

25th August 2003, 12:50 PM	#8
Circlotron diyAudio Member Join Date: Jun 2002 Location: Melbourne, Australia	Use CoolEdit to generate a 20 or 30 minute wav file of pink noise, (NOT white noise) and burn it to a cd and play it on your system. Then plug an electret mic into your pc sound card and use some of the many real-time spectrum analysers to observe the results. An electret mic capsule seems to be much more flat if you remove it from any plastic housing it may be inside. Look for my post here. Calibrating microphone with air hose hiss. __________________ Best-ever T/S parameter spreadsheet. http://www.diyaudio.com/forums/multi...tml#post353269

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29th April 2003, 02:35 PM	#2
phase_accurate diyAudio Member Join Date: May 2002 Location: Switzerland	This one might do the trick, though not within your budget I think: http://www.tactaudio.com/RCS22X/index.html Regards Charles BTW: I have heard it and it is indeed astonishing

29th April 2003, 02:38 PM	#3
SkinnyBoy Banned Join Date: Nov 2002 Location: Adelaide, Australia	I'm looking for a computer program.. that thing looks interesting, and expensive.. lol

30th April 2003, 05:54 AM	#5
Da5id4Vz diyAudio Member Join Date: Feb 2003 Location: lost in america...	Well, This one doesn’t use a sweep oscillator, but it is a step in the direction of what you are talking about. It does not appear to be a complete solution, but a development tool. http://freshmeat.net/projects/drc/?topic_id=114

25th August 2003, 01:08 PM	#9
Jay diyAudio Member Join Date: Feb 2003 Location: Jakarta	Hi SkinnyBoy, Once you get the true response of your system (including the listening room), how will you adjust the audio output? It is not buying an equalizer, is it?

25th August 2003, 01:10 PM	#10
SkinnyBoy Banned Join Date: Nov 2002 Location: Adelaide, Australia	most of my music is played off the computer.....

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