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Old 29th April 2003, 03:22 PM   #1
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Default 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)
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Old 29th April 2003, 03:35 PM   #2
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This one might do the trick, though not within your budget I think:

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

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BTW: I have heard it and it is indeed astonishing
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Old 29th April 2003, 03:38 PM   #3
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I'm looking for a computer program.. that thing looks interesting, and expensive.. lol
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Old 29th April 2003, 04:42 PM   #4
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Default 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.
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Old 30th April 2003, 06:54 AM   #5
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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
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Old 25th August 2003, 10:29 AM   #6
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Default Re: Automatic Equalization program??

Quote:
Originally posted by SkinnyBoy
good idea?
I'm afraid the working microphone will cost you a Scan-Speak Revelator...
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Old 25th August 2003, 01:01 PM   #7
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Default 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.
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Old 25th August 2003, 01:50 PM   #8
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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.
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Old 25th August 2003, 02:08 PM   #9
Jay is offline Jay  Indonesia
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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?
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Old 25th August 2003, 02:10 PM   #10
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most of my music is played off the computer.....
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